Add necessary Makefile.inc1 infrastructure for building on non-FreeBSD

The most awkward bit in this patch is the bootstrapping of m4:
We can't simply use the host version of m4 since that is not compatible
with the flags passed by lex (at least on macOS, possibly also on Linux).
Therefore we need to bootstrap m4, but lex needs m4 to build and m4 also
depends on lex (which needs m4 to generate any files). To work around this
cyclic dependency we can build a bootstrap version of m4 (with pre-generated
files) then use that to build the real m4.

This patch also changes the xz/unxz/dd tools to always use the host version
since the version in the source tree cannot easily be bootstrapped on macOS
or Linux.

Reviewed By:	brooks, imp (earlier version)
Differential Revision: https://reviews.freebsd.org/D25992

8 files changed, 2060 insertions, 50 deletions

diff --git a/Makefile.inc1 b/Makefile.inc1
index 6b77bb195bfd9..0a85d6be6be97 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -167,6 +167,19 @@ _t=		${TARGET_ARCH}/${TARGET}
 .endif
 .endfor
 
+.if ${.MAKE.OS} != "FreeBSD"
+CROSSBUILD_HOST=${.MAKE.OS}
+.if ${.MAKE.OS} != "Linux" && ${.MAKE.OS} != "Darwin"
+.warning "Unsupported crossbuild system: ${.MAKE.OS}. Build will probably fail!"
+.endif
+# We need to force NO_ROOT/DB_FROM_SRC builds when building on other operating
+# systems since the BSD.foo.dist specs contain users and groups that do not
+# exist by default on a Linux/MacOS system.
+NO_ROOT:=	1
+DB_FROM_SRC:=	1
+.export NO_ROOT
+.endif
+
 # If all targets are disabled for system llvm then don't expect it to work
 # for cross-builds.
 .if !defined(TOOLS_PREFIX) && ${MK_LLVM_TARGET_ALL} == "no" && \
@@ -568,13 +581,16 @@ _CPUTYPE!=	MAKEFLAGS= CPUTYPE=${_TARGET_CPUTYPE} ${MAKE} -f /dev/null \
 .endif
 .if make(buildworld)
 BUILD_ARCH!=	uname -p
-.if ${MACHINE_ARCH} != ${BUILD_ARCH}
+# On some Linux systems uname -p returns "unknown" so skip this check there.
+# This check only exists to tell people to use TARGET_ARCH instead of
+# MACHINE_ARCH so skipping it when crossbuilding on non-FreeBSD should be fine.
+.if ${MACHINE_ARCH} != ${BUILD_ARCH} && ${.MAKE.OS} == "FreeBSD"
 .error To cross-build, set TARGET_ARCH.
 .endif
 .endif
 WORLDTMP?=	${OBJTOP}/tmp
 BPATH=		${CCACHE_WRAPPER_PATH_PFX}${WORLDTMP}/legacy/usr/sbin:${WORLDTMP}/legacy/usr/bin:${WORLDTMP}/legacy/bin:${WORLDTMP}/legacy/usr/libexec
-XPATH=		${WORLDTMP}/usr/sbin:${WORLDTMP}/usr/bin
+XPATH=		${WORLDTMP}/bin:${WORLDTMP}/usr/sbin:${WORLDTMP}/usr/bin
 
 # When building we want to find the cross tools before the host tools in ${BPATH}.
 # We also need to add UNIVERSE_TOOLCHAIN_PATH so that we can find the shared
@@ -589,6 +605,13 @@ STRICTTMPPATH=	${XPATH}:${BPATH}:${UNIVERSE_TOOLCHAIN_PATH}
 # USING_SYSTEM_LINKER/USING_SYSTEM_COMPILER. Once these issues have been
 # resolved it will be turned on by default.
 BUILD_WITH_STRICT_TMPPATH?=0
+.if defined(CROSSBUILD_HOST)
+# When building on non-FreeBSD we can't rely on the tools in /usr/bin being compatible
+# with what FreeBSD expects. Therefore we only use tools from STRICTTMPPATH
+# during the world build stage. We build most tools during the bootstrap-tools
+# phase but symlink host tools that are known to work instead of building them
+BUILD_WITH_STRICT_TMPPATH:=1
+.endif
 .if ${BUILD_WITH_STRICT_TMPPATH} != 0
 TMPPATH=	${STRICTTMPPATH}
 .else
@@ -724,7 +747,9 @@ XMAKE=		${BMAKE} \
 # kernel-tools stage
 KTMAKEENV=	INSTALL="sh ${.CURDIR}/tools/install.sh" \
 		PATH=${BPATH}:${PATH} \
-		WORLDTMP=${WORLDTMP}
+		WORLDTMP=${WORLDTMP} \
+		MAKEFLAGS="-m ${.CURDIR}/tools/build/mk ${.MAKEFLAGS}"
+
 KTMAKE=		\
 		TOOLS_PREFIX=${TOOLS_PREFIX_UNDEF:U${WORLDTMP}} \
 		${KTMAKEENV} ${MAKE} ${WORLD_FLAGS} -f Makefile.inc1 \
@@ -845,7 +870,13 @@ NO_META_IGNORE_HOST_HEADERS=	1
 # allows tracking the oldest osreldate to force rebuilds via
 # META_MODE_BADABI_REVS above.
 host-osreldate.h: # DO NOT ADD /usr/include/osreldate.h here
+.if !defined(CROSSBUILD_HOST)
 	@cp -f /usr/include/osreldate.h ${.TARGET}
+.else
+	@echo "#ifndef __FreeBSD_version" > ${.TARGET}
+	@echo "#define __FreeBSD_version ${OSRELDATE}" >> ${.TARGET}
+	@echo "#endif" >> ${.TARGET}
+.endif
 
 WMAKE=		${WMAKEENV} ${MAKE} ${WORLD_FLAGS} -f Makefile.inc1 \
 		BWPHASE=${.TARGET:C,^_,,} \
@@ -1022,7 +1053,8 @@ _bootstrap-tools:
 	@echo ">>> stage 1.2: bootstrap tools"
 	@echo "--------------------------------------------------------------"
 	${_+_}cd ${.CURDIR}; ${BMAKE} bootstrap-tools
-	mkdir -p ${WORLDTMP}/usr ${WORLDTMP}/lib/casper ${WORLDTMP}/lib/geom
+	mkdir -p ${WORLDTMP}/usr ${WORLDTMP}/lib/casper ${WORLDTMP}/lib/geom \
+	    ${WORLDTMP}/bin
 	${WORLDTMP_MTREE} -f ${.CURDIR}/etc/mtree/BSD.usr.dist \
 	    -p ${WORLDTMP}/usr >/dev/null
 	${WORLDTMP_MTREE} -f ${.CURDIR}/etc/mtree/BSD.include.dist \
@@ -1277,11 +1309,15 @@ __installcheck_sh_check: .PHONY
 _zoneinfo=	zic tzsetup
 .endif
 
+.if !defined(CROSSBUILD_HOST)
+_sysctl=sysctl
+.endif
+
 ITOOLS=	[ awk cap_mkdb cat chflags chmod chown cmp cp \
 	date echo egrep find grep id install ${_install-info} \
 	ln make mkdir mtree mv pwd_mkdb \
-	rm sed services_mkdb sh sort strip sysctl test true uname wc ${_zoneinfo} \
-	${LOCAL_ITOOLS}
+	rm sed services_mkdb sh sort strip ${_sysctl} test true uname wc \
+	${_zoneinfo} ${LOCAL_ITOOLS}
 
 # Needed for share/man
 .if ${MK_MAN_UTILS} != "no"
@@ -1317,23 +1353,25 @@ MTREE_MAGIC?=	mtree 2.0
 distributeworld installworld stageworld: _installcheck_world .PHONY
 	mkdir -p ${INSTALLTMP}
 	progs=$$(for prog in ${ITOOLS}; do \
-		if progpath=`which $$prog`; then \
+		if progpath=`env PATH=${TMPPATH} which $$prog`; then \
 			echo $$progpath; \
 		else \
-			echo "Required tool $$prog not found in PATH." >&2; \
-			exit 1; \
-		fi; \
-	    done); \
-	libs=$$(ldd -f "%o %p\n" -f "%o %p\n" $$progs 2>/dev/null | sort -u | \
-	    while read line; do \
-		set -- $$line; \
-		if [ "$$2 $$3" != "not found" ]; then \
-			echo $$2; \
-		else \
-			echo "Required library $$1 not found." >&2; \
+			echo "Required tool $$prog not found in PATH ($$PATH)." >&2; \
 			exit 1; \
 		fi; \
 	    done); \
+	if [ -z "${CROSSBUILD_HOST}" ] ; then \
+		libs=$$(ldd -f "%o %p\n" -f "%o %p\n" $$progs 2>/dev/null | sort -u | \
+		    while read line; do \
+			set -- $$line; \
+			if [ "$$2 $$3" != "not found" ]; then \
+				echo $$2; \
+			else \
+				echo "Required library $$1 not found." >&2; \
+				exit 1; \
+			fi; \
+		    done); \
+	fi; \
 	cp $$libs $$progs ${INSTALLTMP}
 	cp -R $${PATH_LOCALE:-"/usr/share/locale"} ${INSTALLTMP}/locale
 .if defined(NO_ROOT)
@@ -2043,10 +2081,9 @@ update: .PHONY
 # build-tools or cross-tools.
 #
 
-
-# libnv is a requirement for config(8), which is an unconditional
+# libnv and libsbuf are requirements for config(8), which is an unconditional
 # bootstrap-tool.
-_config_deps= lib/libnv
+_config_deps= lib/libnv lib/libsbuf
 
 legacy: .PHONY
 .if ${BOOTSTRAPPING} < ${MINIMUM_SUPPORTED_OSREL} && ${BOOTSTRAPPING} != 0
@@ -2054,7 +2091,7 @@ legacy: .PHONY
 	false
 .endif
 
-.for _tool in tools/build ${_config_deps}
+.for _tool in tools/build
 	${_+_}@${ECHODIR} "===> ${_tool} (obj,includes,all,install)"; \
 	    cd ${.CURDIR}/${_tool}; \
 	    if [ -z "${NO_OBJWALK}" ]; then ${MAKE} DIRPRFX=${_tool}/ obj; fi; \
@@ -2090,12 +2127,23 @@ _bt=		_bootstrap-tools
 # If BOOTSTRAP_ALL_TOOLS is set we will build all the required tools from the
 # current source tree. Otherwise we create a symlink to the version found in
 # $PATH during the bootstrap-tools stage.
+# When building on non-FreeBSD systems we can't assume that the host binaries
+# accept compatible flags or produce compatible output. Therefore we force
+# BOOTSTRAP_ALL_TOOLS and just build the FreeBSD version of the binary.
+.if defined(CROSSBUILD_HOST)
+BOOTSTRAP_ALL_TOOLS:=	1
+.endif
 .if defined(BOOTSTRAP_ALL_TOOLS)
 # BOOTSTRAPPING will be set on the command line so we can't override it here.
 # Instead set BOOTSTRAPPING_OSRELDATE so that the value 0 is set ${BSARGS}
 BOOTSTRAPPING_OSRELDATE:=	0
 .endif
 
+# libnv and libsbuf are requirements for config(8), which is an unconditional
+# bootstrap-tool.
+_config=usr.sbin/config lib/libnv lib/libsbuf
+${_bt}-usr.sbin/config: ${_bt}-lib/libnv ${_bt}-lib/libsbuf
+
 .if ${MK_GAMES} != "no"
 _strfile=	usr.bin/fortune/strfile
 .endif
@@ -2111,13 +2159,20 @@ _vtfontcvt=	usr.bin/vtfontcvt
 # please ensure that you also add a .else case where you add the tool to the
 # _bootstrap_tools_links variable.
 .if ${BOOTSTRAPPING} < 1000033
-_m4=		usr.bin/m4
+# Note: lex needs m4 to build but m4 also depends on lex (which needs m4 to
+# generate any files). To fix this cyclic dependency we can build a bootstrap
+# version of m4 (with pre-generated files) then use that to build the real m4.
+# We can't simply use the host m4 since e.g. the macOS version does not accept
+# the flags that are passed by lex.
+# For lex we also use the pre-gerated files since we would otherwise need to
+# build awk and sed first (which need lex to build)
+# TODO: add a _bootstrap_lex and then build the real lex afterwards
 _lex=		usr.bin/lex
-# Note: lex needs m4 to build but m4 also depends on lex. However, lex can be
-# bootstrapped so we build lex first.
-${_bt}-usr.bin/m4: ${_bt}-lib/libopenbsd ${_bt}-usr.bin/yacc ${_bt}-${_lex}
-_bt_m4_depend=${_bt}-${_m4}
-_bt_lex_depend=${_bt}-${_lex} ${_bt_m4_depend}
+_m4=		tools/build/bootstrap-m4 usr.bin/m4
+${_bt}-tools/build/bootstrap-m4: ${_bt}-usr.bin/lex ${_bt}-lib/libopenbsd ${_bt}-usr.bin/yacc
+${_bt}-usr.bin/m4: ${_bt}-lib/libopenbsd ${_bt}-usr.bin/yacc ${_bt}-usr.bin/lex ${_bt}-tools/build/bootstrap-m4
+_bt_m4_depend=${_bt}-usr.bin/m4
+_bt_lex_depend=${_bt}-usr.bin/lex ${_bt_m4_depend}
 .else
 _bootstrap_tools_links+=m4 lex
 .endif
@@ -2183,12 +2238,15 @@ _bootstrap_tools_links+=crunchgen
 .endif
 
 # r296926 -P keymap search path, MFC to stable/10 in r298297
-.if ${BOOTSTRAPPING} < 1003501 || \
-	(${BOOTSTRAPPING} >= 1100000 && ${BOOTSTRAPPING} < 1100103)
+# Note: kbdcontrol can not be bootstrapped on non-FreeBSD systems
+.if !defined(CROSSBUILD_HOST)
+.if (${BOOTSTRAPPING} < 1003501 || \
+	(${BOOTSTRAPPING} >= 1100000 && ${BOOTSTRAPPING} < 1100103))
 _kbdcontrol=	usr.sbin/kbdcontrol
 .else
 _bootstrap_tools_links+=kbdcontrol
 .endif
+.endif
 
 _yacc=		usr.bin/yacc
 
@@ -2215,6 +2273,7 @@ ${_bt}-usr.bin/clang/lldb-tblgen: ${_bt}-lib/clang/libllvmminimal
 
 .if ${MK_LOCALES} != "no"
 _localedef=	usr.bin/localedef
+${_bt}-usr.bin/localedef: ${_bt}-usr.bin/yacc ${_bt_lex_depend}
 .endif
 
 .if ${MK_KERBEROS} != "no"
@@ -2244,8 +2303,8 @@ ${_bt}-usr.bin/mandoc: ${_bt}-lib/libopenbsd
 _basic_bootstrap_tools_multilink=usr.bin/grep grep,egrep,fgrep
 _basic_bootstrap_tools_multilink+=bin/test test,[
 # bootstrap tools needed by buildworld:
-_basic_bootstrap_tools=usr.bin/cut bin/expr usr.bin/gencat \
-    usr.bin/join usr.bin/mktemp bin/rmdir usr.bin/sed usr.bin/sort \
+_basic_bootstrap_tools+=usr.bin/cut bin/expr usr.bin/gencat usr.bin/join \
+    usr.bin/mktemp bin/realpath bin/rmdir usr.bin/sed usr.bin/sort \
     usr.bin/truncate usr.bin/tsort
 # Some build scripts use nawk instead of awk (this happens at least in
 # cddl/contrib/opensolaris/lib/libdtrace/common/mknames.sh) so we need both awk
@@ -2259,24 +2318,29 @@ _basic_bootstrap_tools+=usr.bin/uuencode usr.bin/uudecode
 _basic_bootstrap_tools+=usr.bin/xargs
 # cap_mkdb is required for share/termcap:
 _basic_bootstrap_tools+=usr.bin/cap_mkdb
-# ldd is required for installcheck (TODO: just always use /usr/bin/ldd instead?)
-_basic_bootstrap_tools+=usr.bin/ldd
 # services_mkdb/pwd_mkdb are required for installworld:
 _basic_bootstrap_tools+=usr.sbin/services_mkdb usr.sbin/pwd_mkdb
+# ldd is required for installcheck (TODO: just always use /usr/bin/ldd instead?)
+.if !defined(CROSSBUILD_HOST)
+# ldd is only needed for updating the running system so we don't need to
+# bootstrap ldd on non-FreeBSD systems
+_basic_bootstrap_tools+=usr.bin/ldd
+.endif
 # sysctl/chflags are required for installkernel:
+.if !defined(CROSSBUILD_HOST)
 _basic_bootstrap_tools+=sbin/sysctl bin/chflags
+.else
+# When building on non-FreeBSD, install a fake chflags instead since the
+# version from the source tree cannot work. We also don't need sysctl since we
+# are install with -DNO_ROOT.
+_other_bootstrap_tools+=tools/build/cross-build/fake_chflags
+.endif
 # mkfifo is used by sys/conf/newvers.sh
 _basic_bootstrap_tools+=usr.bin/mkfifo
 
 .if ${MK_BOOT} != "no"
-_basic_bootstrap_tools+=bin/dd
-# xz/unxz is used by EFI
-_basic_bootstrap_tools_multilink+=usr.bin/xz xz,unxz
 # md5 is used by boot/beri (and possibly others)
 _basic_bootstrap_tools+=sbin/md5
-.if defined(BOOTSTRAP_ALL_TOOLS)
-${_bt}-sbin/md5: ${_bt}-lib/libmd
-.endif
 .endif
 
 .if ${MK_ZONEINFO} != "no"
@@ -2297,6 +2361,10 @@ ${_bt}-usr.sbin/config: ${_bt}-usr.bin/file2c ${_bt_lex_depend}
 # `make legacy` step. Not adding a link to make is important on non-FreeBSD
 # since "make" will usually point to GNU make there.
 _other_bootstrap_tools+=usr.bin/bmake
+
+# Avoid dependency on host bz2 headers:
+_other_bootstrap_tools+=lib/libbz2
+${_bt}-usr.bin/grep: ${_bt}-lib/libbz2
 .else
 # All tools in _basic_bootstrap_tools have the same name as the subdirectory
 # so we can use :T to get the name of the symlinks that we need to create.
@@ -2346,7 +2414,7 @@ bootstrap-tools: ${_bt}-links .PHONY
     ${_other_bootstrap_tools} \
     usr.bin/xinstall \
     ${_gensnmptree} \
-    usr.sbin/config \
+    ${_config} \
     ${_flua} \
     ${_crunchide} \
     ${_crunchgen} \
@@ -2365,6 +2433,14 @@ ${_bt}-${_tool}: ${_bt}-links .PHONY .MAKE
 
 bootstrap-tools: ${_bt}-${_tool}
 .endfor
+.if target(${_bt}-lib/libmd)
+# If we are bootstrapping libmd (e.g. when building on macOS/Linux) add the
+# necessary dependencies:
+${_bt}-usr.bin/sort: ${_bt}-lib/libmd
+${_bt}-usr.bin/xinstall: ${_bt}-lib/libmd
+${_bt}-sbin/md5: ${_bt}-lib/libmd
+.endif
+
 
 #
 # build-tools: Build special purpose build tools
diff --git a/sys/conf/kern.post.mk b/sys/conf/kern.post.mk
index 883c8d8b52f85..5f9d55c07a2f5 100644
--- a/sys/conf/kern.post.mk
+++ b/sys/conf/kern.post.mk
@@ -395,7 +395,7 @@ kernel-install: .PHONY
 		exit 1 ; \
 	fi
 .if exists(${DESTDIR}${KODIR})
-	-thiskernel=`sysctl -n kern.bootfile` ; \
+	-thiskernel=`sysctl -n kern.bootfile || echo /boot/kernel/kernel` ; \
 	if [ ! "`dirname "$$thiskernel"`" -ef ${DESTDIR}${KODIR} ] ; then \
 		chflags -R noschg ${DESTDIR}${KODIR} ; \
 		rm -rf ${DESTDIR}${KODIR} ; \
diff --git a/tools/build/Makefile b/tools/build/Makefile
index da8ff9cc4a93f..023c6cf99f6f4 100644
--- a/tools/build/Makefile
+++ b/tools/build/Makefile
@@ -260,8 +260,8 @@ SYSINCS+=	${SRCTOP}/sys/sys/elf.h
 # Linux/MacOS since we only use flags that are supported by all of them.
 _host_tools_to_symlink=	basename bzip2 bunzip2 chmod chown cmp comm cp date dd \
 	dirname echo env false find fmt gzip gunzip head hostname id ln ls \
-	mkdir mv nice patch rm realpath sh sleep stat tee touch tr true \
-	uname uniq wc which
+	mkdir mv nice patch rm sh sleep stat tee touch tr true uname uniq unxz \
+	wc which xz
 
 # We also need a symlink to the absolute path to the make binary used for
 # the toplevel makefile. This is not necessarily the same as `which make`
@@ -285,9 +285,9 @@ _host_tools_to_symlink:=${_host_tools_to_symlink:Nsh}
 host-symlinks:
 	@echo "Linking host tools into ${DESTDIR}/bin"
 .for _tool in ${_host_tools_to_symlink}
-	@source_path=`which ${_tool}`; \
+	@export PATH=$${PATH}:/usr/local/bin; source_path=`which ${_tool}`; \
 	if [ ! -e "$${source_path}" ] ; then \
-		echo "Cannot find host tool '${_tool}'"; false; \
+		echo "Cannot find host tool '${_tool}' in PATH ($$PATH)." >&2; false; \
 	fi; \
 	rm -f "${DESTDIR}/bin/${_tool}"; \
 	cp -pf "$${source_path}" "${DESTDIR}/bin/${_tool}"
@@ -330,7 +330,7 @@ installdirs:
 
 .for _dir in sbin usr/sbin usr/bin
 # delete existing directories from before r340157
-	@if [ ! -L ${DESTDIR}/${_dir} ]; then \
+	@if [ -e ${DESTDIR}/${_dir} ] && [ ! -L ${DESTDIR}/${_dir} ]; then \
 	    echo "removing old non-symlink ${DESTDIR}/${_dir}"; \
 	    rm -rf "${DESTDIR}/${_dir}"; \
 	fi
diff --git a/tools/build/bootstrap-m4/Makefile b/tools/build/bootstrap-m4/Makefile
new file mode 100644
index 0000000000000..d65dece3fd157
--- /dev/null
+++ b/tools/build/bootstrap-m4/Makefile
@@ -0,0 +1,27 @@
+# $FreeBSD$
+
+# Build a bootstrap version of m4 (needed in order to build libelf and lex)
+.PATH: ${SRCTOP}/usr.bin/m4 ${.CURDIR}
+
+# Avoid using lex or yacc to generate sources
+LEX:=/this/should/not/be/used
+
+tokenizer.c: bootstrap_m4_tokenizer
+	test -e ${.TARGET}
+
+# This target is used as a marker in usr.bin/m4/Makefile to not add the
+# lex and yacc includes. Therefore we must define it before including
+# the other Makefile.
+bootstrap_m4_tokenizer: inittokenizer.c
+.for _f in tokenizer.c
+	@cmp -s ${.CURDIR}/init${_f} ${_f} || { \
+		echo "Bootstrapping ${_f}" ; \
+		${CP} ${.CURDIR}/init${_f} ${_f} ; \
+	}
+.endfor
+
+BINDIR=	/usr/bin
+.include "${SRCTOP}/usr.bin/m4/Makefile"
+
+regen:
+	(cd ${SRCTOP}/usr.bin/m4 && lex -t ${SRCTOP}/usr.bin/m4/tokenizer.l) | grep -v '#line' > inittokenizer.c
diff --git a/tools/build/bootstrap-m4/inittokenizer.c b/tools/build/bootstrap-m4/inittokenizer.c
new file mode 100644
index 0000000000000..0c07f1ec22757
--- /dev/null
+++ b/tools/build/bootstrap-m4/inittokenizer.c
@@ -0,0 +1,1850 @@
+
+
+#define  YY_INT_ALIGNED short int
+
+/* A lexical scanner generated by flex */
+
+#define FLEX_SCANNER
+#define YY_FLEX_MAJOR_VERSION 2
+#define YY_FLEX_MINOR_VERSION 5
+#define YY_FLEX_SUBMINOR_VERSION 37
+#if YY_FLEX_SUBMINOR_VERSION > 0
+#define FLEX_BETA
+#endif
+
+/* First, we deal with  platform-specific or compiler-specific issues. */
+
+#if defined(__FreeBSD__)
+#ifndef __STDC_LIMIT_MACROS
+#define	__STDC_LIMIT_MACROS
+#endif
+#include <sys/cdefs.h>
+#include <stdint.h>
+#else
+#define	__dead2
+#endif
+
+/* begin standard C headers. */
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+
+/* end standard C headers. */
+
+/* flex integer type definitions */
+
+#ifndef FLEXINT_H
+#define FLEXINT_H
+
+/* C99 systems have <inttypes.h>. Non-C99 systems may or may not. */
+
+#if defined(__FreeBSD__) || \
+    (defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L)
+
+/* C99 says to define __STDC_LIMIT_MACROS before including stdint.h,
+ * if you want the limit (max/min) macros for int types. 
+ */
+#ifndef __STDC_LIMIT_MACROS
+#define __STDC_LIMIT_MACROS 1
+#endif
+
+#include <inttypes.h>
+typedef int8_t flex_int8_t;
+typedef uint8_t flex_uint8_t;
+typedef int16_t flex_int16_t;
+typedef uint16_t flex_uint16_t;
+typedef int32_t flex_int32_t;
+typedef uint32_t flex_uint32_t;
+#else
+typedef signed char flex_int8_t;
+typedef short int flex_int16_t;
+typedef int flex_int32_t;
+typedef unsigned char flex_uint8_t; 
+typedef unsigned short int flex_uint16_t;
+typedef unsigned int flex_uint32_t;
+
+/* Limits of integral types. */
+#ifndef INT8_MIN
+#define INT8_MIN               (-128)
+#endif
+#ifndef INT16_MIN
+#define INT16_MIN              (-32767-1)
+#endif
+#ifndef INT32_MIN
+#define INT32_MIN              (-2147483647-1)
+#endif
+#ifndef INT8_MAX
+#define INT8_MAX               (127)
+#endif
+#ifndef INT16_MAX
+#define INT16_MAX              (32767)
+#endif
+#ifndef INT32_MAX
+#define INT32_MAX              (2147483647)
+#endif
+#ifndef UINT8_MAX
+#define UINT8_MAX              (255U)
+#endif
+#ifndef UINT16_MAX
+#define UINT16_MAX             (65535U)
+#endif
+#ifndef UINT32_MAX
+#define UINT32_MAX             (4294967295U)
+#endif
+
+#endif /* ! C99 */
+
+#endif /* ! FLEXINT_H */
+
+#ifdef __cplusplus
+
+/* The "const" storage-class-modifier is valid. */
+#define YY_USE_CONST
+
+#else	/* ! __cplusplus */
+
+/* C99 requires __STDC__ to be defined as 1. */
+#if defined (__STDC__)
+
+#define YY_USE_CONST
+
+#endif	/* defined (__STDC__) */
+#endif	/* ! __cplusplus */
+
+#ifdef YY_USE_CONST
+#define yyconst const
+#else
+#define yyconst
+#endif
+
+/* Returned upon end-of-file. */
+#define YY_NULL 0
+
+/* Promotes a possibly negative, possibly signed char to an unsigned
+ * integer for use as an array index.  If the signed char is negative,
+ * we want to instead treat it as an 8-bit unsigned char, hence the
+ * double cast.
+ */
+#define YY_SC_TO_UI(c) ((unsigned int) (unsigned char) c)
+
+/* Enter a start condition.  This macro really ought to take a parameter,
+ * but we do it the disgusting crufty way forced on us by the ()-less
+ * definition of BEGIN.
+ */
+#define BEGIN (yy_start) = 1 + 2 *
+
+/* Translate the current start state into a value that can be later handed
+ * to BEGIN to return to the state.  The YYSTATE alias is for lex
+ * compatibility.
+ */
+#define YY_START (((yy_start) - 1) / 2)
+#define YYSTATE YY_START
+
+/* Action number for EOF rule of a given start state. */
+#define YY_STATE_EOF(state) (YY_END_OF_BUFFER + state + 1)
+
+/* Special action meaning "start processing a new file". */
+#define YY_NEW_FILE yyrestart(yyin  )
+
+#define YY_END_OF_BUFFER_CHAR 0
+
+/* Size of default input buffer. */
+#ifndef YY_BUF_SIZE
+#define YY_BUF_SIZE 16384
+#endif
+
+/* The state buf must be large enough to hold one state per character in the main buffer.
+ */
+#define YY_STATE_BUF_SIZE   ((YY_BUF_SIZE + 2) * sizeof(yy_state_type))
+
+#ifndef YY_TYPEDEF_YY_BUFFER_STATE
+#define YY_TYPEDEF_YY_BUFFER_STATE
+typedef struct yy_buffer_state *YY_BUFFER_STATE;
+#endif
+
+#ifndef YY_TYPEDEF_YY_SIZE_T
+#define YY_TYPEDEF_YY_SIZE_T
+typedef size_t yy_size_t;
+#endif
+
+extern yy_size_t yyleng;
+
+extern FILE *yyin, *yyout;
+
+#define EOB_ACT_CONTINUE_SCAN 0
+#define EOB_ACT_END_OF_FILE 1
+#define EOB_ACT_LAST_MATCH 2
+
+    #define YY_LESS_LINENO(n)
+    
+/* Return all but the first "n" matched characters back to the input stream. */
+#define yyless(n) \
+	do \
+		{ \
+		/* Undo effects of setting up yytext. */ \
+        int yyless_macro_arg = (n); \
+        YY_LESS_LINENO(yyless_macro_arg);\
+		*yy_cp = (yy_hold_char); \
+		YY_RESTORE_YY_MORE_OFFSET \
+		(yy_c_buf_p) = yy_cp = yy_bp + yyless_macro_arg - YY_MORE_ADJ; \
+		YY_DO_BEFORE_ACTION; /* set up yytext again */ \
+		} \
+	while ( 0 )
+
+#define unput(c) yyunput( c, (yytext_ptr)  )
+
+#ifndef YY_STRUCT_YY_BUFFER_STATE
+#define YY_STRUCT_YY_BUFFER_STATE
+struct yy_buffer_state
+	{
+	FILE *yy_input_file;
+
+	char *yy_ch_buf;		/* input buffer */
+	char *yy_buf_pos;		/* current position in input buffer */
+
+	/* Size of input buffer in bytes, not including room for EOB
+	 * characters.
+	 */
+	yy_size_t yy_buf_size;
+
+	/* Number of characters read into yy_ch_buf, not including EOB
+	 * characters.
+	 */
+	yy_size_t yy_n_chars;
+
+	/* Whether we "own" the buffer - i.e., we know we created it,
+	 * and can realloc() it to grow it, and should free() it to
+	 * delete it.
+	 */
+	int yy_is_our_buffer;
+
+	/* Whether this is an "interactive" input source; if so, and
+	 * if we're using stdio for input, then we want to use getc()
+	 * instead of fread(), to make sure we stop fetching input after
+	 * each newline.
+	 */
+	int yy_is_interactive;
+
+	/* Whether we're considered to be at the beginning of a line.
+	 * If so, '^' rules will be active on the next match, otherwise
+	 * not.
+	 */
+	int yy_at_bol;
+
+    int yy_bs_lineno; /**< The line count. */
+    int yy_bs_column; /**< The column count. */
+    
+	/* Whether to try to fill the input buffer when we reach the
+	 * end of it.
+	 */
+	int yy_fill_buffer;
+
+	int yy_buffer_status;
+
+#define YY_BUFFER_NEW 0
+#define YY_BUFFER_NORMAL 1
+	/* When an EOF's been seen but there's still some text to process
+	 * then we mark the buffer as YY_EOF_PENDING, to indicate that we
+	 * shouldn't try reading from the input source any more.  We might
+	 * still have a bunch of tokens to match, though, because of
+	 * possible backing-up.
+	 *
+	 * When we actually see the EOF, we change the status to "new"
+	 * (via yyrestart()), so that the user can continue scanning by
+	 * just pointing yyin at a new input file.
+	 */
+#define YY_BUFFER_EOF_PENDING 2
+
+	};
+#endif /* !YY_STRUCT_YY_BUFFER_STATE */
+
+/* Stack of input buffers. */
+static size_t yy_buffer_stack_top = 0; /**< index of top of stack. */
+static size_t yy_buffer_stack_max = 0; /**< capacity of stack. */
+static YY_BUFFER_STATE * yy_buffer_stack = 0; /**< Stack as an array. */
+
+/* We provide macros for accessing buffer states in case in the
+ * future we want to put the buffer states in a more general
+ * "scanner state".
+ *
+ * Returns the top of the stack, or NULL.
+ */
+#define YY_CURRENT_BUFFER ( (yy_buffer_stack) \
+                          ? (yy_buffer_stack)[(yy_buffer_stack_top)] \
+                          : NULL)
+#define yy_current_buffer YY_CURRENT_BUFFER
+
+/* Same as previous macro, but useful when we know that the buffer stack is not
+ * NULL or when we need an lvalue. For internal use only.
+ */
+#define YY_CURRENT_BUFFER_LVALUE (yy_buffer_stack)[(yy_buffer_stack_top)]
+
+/* yy_hold_char holds the character lost when yytext is formed. */
+static char yy_hold_char;
+static yy_size_t yy_n_chars;		/* number of characters read into yy_ch_buf */
+yy_size_t yyleng;
+
+/* Points to current character in buffer. */
+static char *yy_c_buf_p = (char *) 0;
+static int yy_init = 0;		/* whether we need to initialize */
+static int yy_start = 0;	/* start state number */
+
+/* Flag which is used to allow yywrap()'s to do buffer switches
+ * instead of setting up a fresh yyin.  A bit of a hack ...
+ */
+static int yy_did_buffer_switch_on_eof;
+
+void yyrestart (FILE *input_file  );
+void yy_switch_to_buffer (YY_BUFFER_STATE new_buffer  );
+YY_BUFFER_STATE yy_create_buffer (FILE *file,int size  );
+void yy_delete_buffer (YY_BUFFER_STATE b  );
+void yy_flush_buffer (YY_BUFFER_STATE b  );
+void yypush_buffer_state (YY_BUFFER_STATE new_buffer  );
+void yypop_buffer_state (void );
+
+static void yyensure_buffer_stack (void );
+static void yy_load_buffer_state (void );
+static void yy_init_buffer (YY_BUFFER_STATE b,FILE *file  );
+
+#define YY_FLUSH_BUFFER yy_flush_buffer(YY_CURRENT_BUFFER )
+
+YY_BUFFER_STATE yy_scan_buffer (char *base,yy_size_t size  );
+YY_BUFFER_STATE yy_scan_string (yyconst char *yy_str  );
+YY_BUFFER_STATE yy_scan_bytes (yyconst char *bytes,yy_size_t len  );
+
+void *yyalloc (yy_size_t  );
+void *yyrealloc (void *,yy_size_t  );
+void yyfree (void *  );
+
+#define yy_new_buffer yy_create_buffer
+
+#define yy_set_interactive(is_interactive) \
+	{ \
+	if ( ! YY_CURRENT_BUFFER ){ \
+        yyensure_buffer_stack (); \
+		YY_CURRENT_BUFFER_LVALUE =    \
+            yy_create_buffer(yyin,YY_BUF_SIZE ); \
+	} \
+	YY_CURRENT_BUFFER_LVALUE->yy_is_interactive = is_interactive; \
+	}
+
+#define yy_set_bol(at_bol) \
+	{ \
+	if ( ! YY_CURRENT_BUFFER ){\
+        yyensure_buffer_stack (); \
+		YY_CURRENT_BUFFER_LVALUE =    \
+            yy_create_buffer(yyin,YY_BUF_SIZE ); \
+	} \
+	YY_CURRENT_BUFFER_LVALUE->yy_at_bol = at_bol; \
+	}
+
+#define YY_AT_BOL() (YY_CURRENT_BUFFER_LVALUE->yy_at_bol)
+
+/* Begin user sect3 */
+
+#define yywrap() 1
+#define YY_SKIP_YYWRAP
+
+typedef unsigned char YY_CHAR;
+
+FILE *yyin = (FILE *) 0, *yyout = (FILE *) 0;
+
+typedef int yy_state_type;
+
+extern int yylineno;
+
+int yylineno = 1;
+
+extern char *yytext;
+#define yytext_ptr yytext
+
+static yy_state_type yy_get_previous_state (void );
+static yy_state_type yy_try_NUL_trans (yy_state_type current_state  );
+static int yy_get_next_buffer (void );
+static void yy_fatal_error (yyconst char msg[]  ) __dead2;
+
+/* Done after the current pattern has been matched and before the
+ * corresponding action - sets up yytext.
+ */
+#define YY_DO_BEFORE_ACTION \
+	(yytext_ptr) = yy_bp; \
+	yyleng = (size_t) (yy_cp - yy_bp); \
+	(yy_hold_char) = *yy_cp; \
+	*yy_cp = '\0'; \
+	(yy_c_buf_p) = yy_cp;
+
+#define YY_NUM_RULES 14
+#define YY_END_OF_BUFFER 15
+/* This struct is not used in this scanner,
+   but its presence is necessary. */
+struct yy_trans_info
+	{
+	flex_int32_t yy_verify;
+	flex_int32_t yy_nxt;
+	};
+static yyconst flex_int16_t yy_accept[35] =
+    {   0,
+        0,    0,   15,   13,    1,    1,   13,   13,   13,    2,
+        2,   13,   13,   13,   13,    1,    9,   10,   12,    2,
+        0,    0,    2,    6,    4,    8,    5,    7,   11,    0,
+        2,    0,    3,    0
+    } ;
+
+static yyconst flex_int32_t yy_ec[256] =
+    {   0,
+        1,    1,    1,    1,    1,    1,    1,    1,    2,    3,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    2,    4,    1,    1,    1,    1,    5,    1,    1,
+        1,    6,    1,    1,    1,    1,    1,    7,    8,    8,
+        8,    8,    8,    8,    8,    9,    9,   10,    1,   11,
+       12,   13,    1,    1,   14,   14,   14,   14,   14,   14,
+       15,   15,   15,   15,   15,   15,   15,   15,   15,   15,
+       15,   16,   15,   15,   15,   15,   15,   17,   15,   15,
+        1,    1,    1,    1,    1,    1,   14,   14,   14,   14,
+
+       14,   14,   15,   15,   15,   15,   15,   15,   15,   15,
+       15,   15,   15,   16,   15,   15,   15,   15,   15,   17,
+       15,   15,    1,   18,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1
+    } ;
+
+static yyconst flex_int32_t yy_meta[19] =
+    {   0,
+        1,    1,    1,    1,    1,    1,    2,    2,    2,    1,
+        1,    1,    1,    3,    4,    4,    4,    1
+    } ;
+
+static yyconst flex_int16_t yy_base[39] =
+    {   0,
+        0,    0,   48,   49,   17,   19,   35,   41,   39,   16,
+        0,   14,   32,   15,   25,   27,   49,   49,   49,   27,
+        0,    0,    0,   49,   49,   49,   49,   49,   49,   32,
+        0,    0,    0,   49,   39,   29,   34,   36
+    } ;
+
+static yyconst flex_int16_t yy_def[39] =
+    {   0,
+       34,    1,   34,   34,   34,   34,   34,   34,   34,   34,
+       35,   34,   34,   34,   34,   34,   34,   34,   34,   34,
+       36,   37,   35,   34,   34,   34,   34,   34,   34,   36,
+       37,   38,   38,    0,   34,   34,   34,   34
+    } ;
+
+static yyconst flex_int16_t yy_nxt[68] =
+    {   0,
+        4,    5,    6,    7,    8,    9,   10,   11,   11,    4,
+       12,   13,   14,    4,    4,    4,    4,   15,   16,   16,
+       16,   16,   20,   20,   24,   25,   27,   28,   16,   16,
+       30,   21,   22,   20,   20,   31,   31,   33,   33,   33,
+       23,   32,   29,   26,   19,   18,   17,   34,    3,   34,
+       34,   34,   34,   34,   34,   34,   34,   34,   34,   34,
+       34,   34,   34,   34,   34,   34,   34
+    } ;
+
+static yyconst flex_int16_t yy_chk[68] =
+    {   0,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    5,    5,
+        6,    6,   10,   10,   12,   12,   14,   14,   16,   16,
+       36,   10,   10,   20,   20,   37,   37,   38,   38,   38,
+       35,   30,   15,   13,    9,    8,    7,    3,   34,   34,
+       34,   34,   34,   34,   34,   34,   34,   34,   34,   34,
+       34,   34,   34,   34,   34,   34,   34
+    } ;
+
+static yy_state_type yy_last_accepting_state;
+static char *yy_last_accepting_cpos;
+
+extern int yy_flex_debug;
+int yy_flex_debug = 0;
+
+/* The intent behind this definition is that it'll catch
+ * any uses of REJECT which flex missed.
+ */
+#define REJECT reject_used_but_not_detected
+#define yymore() yymore_used_but_not_detected
+#define YY_MORE_ADJ 0
+#define YY_RESTORE_YY_MORE_OFFSET
+char *yytext;
+#define YY_NO_INPUT 1
+/* $OpenBSD: tokenizer.l,v 1.9 2017/06/15 13:48:42 bcallah Exp $ */
+/*
+ * Copyright (c) 2004 Marc Espie <espie@cvs.openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * $FreeBSD$
+ */
+#include "parser.h"
+#include <assert.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <stdint.h>
+#include <limits.h>
+
+extern void m4_warnx(const char *, ...);
+extern int mimic_gnu;
+extern int32_t yylval;
+
+int32_t number(void);
+int32_t parse_radix(void);
+extern int yylex(void);
+
+#define	YY_DECL	int yylex(void)
+
+#define INITIAL 0
+
+#ifndef YY_NO_UNISTD_H
+/* Special case for "unistd.h", since it is non-ANSI. We include it way
+ * down here because we want the user's section 1 to have been scanned first.
+ * The user has a chance to override it with an option.
+ */
+#include <unistd.h>
+#endif
+
+#ifndef YY_EXTRA_TYPE
+#define YY_EXTRA_TYPE void *
+#endif
+
+static int yy_init_globals (void );
+
+/* Accessor methods to globals.
+   These are made visible to non-reentrant scanners for convenience. */
+
+int yylex_destroy (void );
+
+int yyget_debug (void );
+
+void yyset_debug (int debug_flag  );
+
+YY_EXTRA_TYPE yyget_extra (void );
+
+void yyset_extra (YY_EXTRA_TYPE user_defined  );
+
+FILE *yyget_in (void );
+
+void yyset_in  (FILE * in_str  );
+
+FILE *yyget_out (void );
+
+void yyset_out  (FILE * out_str  );
+
+yy_size_t yyget_leng (void );
+
+char *yyget_text (void );
+
+int yyget_lineno (void );
+
+void yyset_lineno (int line_number  );
+
+/* Macros after this point can all be overridden by user definitions in
+ * section 1.
+ */
+
+#ifndef YY_SKIP_YYWRAP
+#ifdef __cplusplus
+extern "C" int yywrap (void );
+#else
+extern int yywrap (void );
+#endif
+#endif
+
+#ifndef yytext_ptr
+static void yy_flex_strncpy (char *,yyconst char *,int );
+#endif
+
+#ifdef YY_NEED_STRLEN
+static int yy_flex_strlen (yyconst char * );
+#endif
+
+#ifndef YY_NO_INPUT
+
+#ifdef __cplusplus
+static int yyinput (void );
+#else
+static int input (void );
+#endif
+
+#endif
+
+/* Amount of stuff to slurp up with each read. */
+#ifndef YY_READ_BUF_SIZE
+#define YY_READ_BUF_SIZE 8192
+#endif
+
+/* Copy whatever the last rule matched to the standard output. */
+#ifndef ECHO
+/* This used to be an fputs(), but since the string might contain NUL's,
+ * we now use fwrite().
+ */
+#define ECHO do { if (fwrite( yytext, yyleng, 1, yyout )) {} } while (0)
+#endif
+
+/* Gets input and stuffs it into "buf".  number of characters read, or YY_NULL,
+ * is returned in "result".
+ */
+#ifndef YY_INPUT
+#define YY_INPUT(buf,result,max_size) \
+	if ( YY_CURRENT_BUFFER_LVALUE->yy_is_interactive ) \
+		{ \
+		int c = '*'; \
+		size_t n; \
+		for ( n = 0; n < max_size && \
+			     (c = getc( yyin )) != EOF && c != '\n'; ++n ) \
+			buf[n] = (char) c; \
+		if ( c == '\n' ) \
+			buf[n++] = (char) c; \
+		if ( c == EOF && ferror( yyin ) ) \
+			YY_FATAL_ERROR( "input in flex scanner failed" ); \
+		result = n; \
+		} \
+	else \
+		{ \
+		errno=0; \
+		while ( (result = fread(buf, 1, max_size, yyin))==0 && ferror(yyin)) \
+			{ \
+			if( errno != EINTR) \
+				{ \
+				YY_FATAL_ERROR( "input in flex scanner failed" ); \
+				break; \
+				} \
+			errno=0; \
+			clearerr(yyin); \
+			} \
+		}\
+\
+
+#endif
+
+/* No semi-colon after return; correct usage is to write "yyterminate();" -
+ * we don't want an extra ';' after the "return" because that will cause
+ * some compilers to complain about unreachable statements.
+ */
+#ifndef yyterminate
+#define yyterminate() return YY_NULL
+#endif
+
+/* Number of entries by which start-condition stack grows. */
+#ifndef YY_START_STACK_INCR
+#define YY_START_STACK_INCR 25
+#endif
+
+/* Report a fatal error. */
+#ifndef YY_FATAL_ERROR
+#define YY_FATAL_ERROR(msg) yy_fatal_error( msg )
+#endif
+
+/* end tables serialization structures and prototypes */
+
+/* Default declaration of generated scanner - a define so the user can
+ * easily add parameters.
+ */
+#ifndef YY_DECL
+#define YY_DECL_IS_OURS 1
+
+extern int yylex (void);
+
+#define YY_DECL int yylex (void)
+#endif /* !YY_DECL */
+
+/* Code executed at the beginning of each rule, after yytext and yyleng
+ * have been set up.
+ */
+#ifndef YY_USER_ACTION
+#define YY_USER_ACTION
+#endif
+
+/* Code executed at the end of each rule. */
+#ifndef YY_BREAK
+#define YY_BREAK break;
+#endif
+
+#define YY_RULE_SETUP \
+	YY_USER_ACTION
+
+/** The main scanner function which does all the work.
+ */
+YY_DECL
+{
+	yy_state_type yy_current_state;
+	char *yy_cp, *yy_bp;
+	int yy_act;
+    
+
+
+	if ( !(yy_init) )
+		{
+		(yy_init) = 1;
+
+#ifdef YY_USER_INIT
+		YY_USER_INIT;
+#endif
+
+		if ( ! (yy_start) )
+			(yy_start) = 1;	/* first start state */
+
+		if ( ! yyin )
+			yyin = stdin;
+
+		if ( ! yyout )
+			yyout = stdout;
+
+		if ( ! YY_CURRENT_BUFFER ) {
+			yyensure_buffer_stack ();
+			YY_CURRENT_BUFFER_LVALUE =
+				yy_create_buffer(yyin,YY_BUF_SIZE );
+		}
+
+		yy_load_buffer_state( );
+		}
+
+	while ( 1 )		/* loops until end-of-file is reached */
+		{
+		yy_cp = (yy_c_buf_p);
+
+		/* Support of yytext. */
+		*yy_cp = (yy_hold_char);
+
+		/* yy_bp points to the position in yy_ch_buf of the start of
+		 * the current run.
+		 */
+		yy_bp = yy_cp;
+
+		yy_current_state = (yy_start);
+yy_match:
+		do
+			{
+			YY_CHAR yy_c = yy_ec[YY_SC_TO_UI(*yy_cp)] ;
+			if ( yy_accept[yy_current_state] )
+				{
+				(yy_last_accepting_state) = yy_current_state;
+				(yy_last_accepting_cpos) = yy_cp;
+				}
+			while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
+				{
+				yy_current_state = (int) yy_def[yy_current_state];
+				if ( yy_current_state >= 35 )
+					yy_c = yy_meta[(unsigned int) yy_c];
+				}
+			yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
+			++yy_cp;
+			}
+		while ( yy_base[yy_current_state] != 49 );
+
+yy_find_action:
+		yy_act = yy_accept[yy_current_state];
+		if ( yy_act == 0 )
+			{ /* have to back up */
+			yy_cp = (yy_last_accepting_cpos);
+			yy_current_state = (yy_last_accepting_state);
+			yy_act = yy_accept[yy_current_state];
+			}
+
+		YY_DO_BEFORE_ACTION;
+
+do_action:	/* This label is used only to access EOF actions. */
+
+		switch ( yy_act )
+	{ /* beginning of action switch */
+			case 0: /* must back up */
+			/* undo the effects of YY_DO_BEFORE_ACTION */
+			*yy_cp = (yy_hold_char);
+			yy_cp = (yy_last_accepting_cpos);
+			yy_current_state = (yy_last_accepting_state);
+			goto yy_find_action;
+
+case 1:
+/* rule 1 can match eol */
+YY_RULE_SETUP
+{/* just skip it */}
+	YY_BREAK
+case 2:
+YY_RULE_SETUP
+{ yylval = number(); return(NUMBER); }
+	YY_BREAK
+case 3:
+YY_RULE_SETUP
+{ if (mimic_gnu) {
+				yylval = parse_radix(); return(NUMBER);
+			  } else {
+			  	return(ERROR);
+			  }
+			}
+	YY_BREAK
+case 4:
+YY_RULE_SETUP
+{ return(LE); }
+	YY_BREAK
+case 5:
+YY_RULE_SETUP
+{ return(GE); }
+	YY_BREAK
+case 6:
+YY_RULE_SETUP
+{ return(LSHIFT); }
+	YY_BREAK
+case 7:
+YY_RULE_SETUP
+{ return(RSHIFT); }
+	YY_BREAK
+case 8:
+YY_RULE_SETUP
+{ return(EQ); }
+	YY_BREAK
+case 9:
+YY_RULE_SETUP
+{ return(NE); }
+	YY_BREAK
+case 10:
+YY_RULE_SETUP
+{ return(LAND); }
+	YY_BREAK
+case 11:
+YY_RULE_SETUP
+{ return(LOR); }
+	YY_BREAK
+case 12:
+YY_RULE_SETUP
+{ if (mimic_gnu) { return (EXPONENT); } }
+	YY_BREAK
+case 13:
+YY_RULE_SETUP
+{ return yytext[0]; }
+	YY_BREAK
+case 14:
+YY_RULE_SETUP
+ECHO;
+	YY_BREAK
+case YY_STATE_EOF(INITIAL):
+	yyterminate();
+
+	case YY_END_OF_BUFFER:
+		{
+		/* Amount of text matched not including the EOB char. */
+		int yy_amount_of_matched_text = (int) (yy_cp - (yytext_ptr)) - 1;
+
+		/* Undo the effects of YY_DO_BEFORE_ACTION. */
+		*yy_cp = (yy_hold_char);
+		YY_RESTORE_YY_MORE_OFFSET
+
+		if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_NEW )
+			{
+			/* We're scanning a new file or input source.  It's
+			 * possible that this happened because the user
+			 * just pointed yyin at a new source and called
+			 * yylex().  If so, then we have to assure
+			 * consistency between YY_CURRENT_BUFFER and our
+			 * globals.  Here is the right place to do so, because
+			 * this is the first action (other than possibly a
+			 * back-up) that will match for the new input source.
+			 */
+			(yy_n_chars) = YY_CURRENT_BUFFER_LVALUE->yy_n_chars;
+			YY_CURRENT_BUFFER_LVALUE->yy_input_file = yyin;
+			YY_CURRENT_BUFFER_LVALUE->yy_buffer_status = YY_BUFFER_NORMAL;
+			}
+
+		/* Note that here we test for yy_c_buf_p "<=" to the position
+		 * of the first EOB in the buffer, since yy_c_buf_p will
+		 * already have been incremented past the NUL character
+		 * (since all states make transitions on EOB to the
+		 * end-of-buffer state).  Contrast this with the test
+		 * in input().
+		 */
+		if ( (yy_c_buf_p) <= &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] )
+			{ /* This was really a NUL. */
+			yy_state_type yy_next_state;
+
+			(yy_c_buf_p) = (yytext_ptr) + yy_amount_of_matched_text;
+
+			yy_current_state = yy_get_previous_state(  );
+
+			/* Okay, we're now positioned to make the NUL
+			 * transition.  We couldn't have
+			 * yy_get_previous_state() go ahead and do it
+			 * for us because it doesn't know how to deal
+			 * with the possibility of jamming (and we don't
+			 * want to build jamming into it because then it
+			 * will run more slowly).
+			 */
+
+			yy_next_state = yy_try_NUL_trans( yy_current_state );
+
+			yy_bp = (yytext_ptr) + YY_MORE_ADJ;
+
+			if ( yy_next_state )
+				{
+				/* Consume the NUL. */
+				yy_cp = ++(yy_c_buf_p);
+				yy_current_state = yy_next_state;
+				goto yy_match;
+				}
+
+			else
+				{
+				yy_cp = (yy_c_buf_p);
+				goto yy_find_action;
+				}
+			}
+
+		else switch ( yy_get_next_buffer(  ) )
+			{
+			case EOB_ACT_END_OF_FILE:
+				{
+				(yy_did_buffer_switch_on_eof) = 0;
+
+				if ( yywrap( ) )
+					{
+					/* Note: because we've taken care in
+					 * yy_get_next_buffer() to have set up
+					 * yytext, we can now set up
+					 * yy_c_buf_p so that if some total
+					 * hoser (like flex itself) wants to
+					 * call the scanner after we return the
+					 * YY_NULL, it'll still work - another
+					 * YY_NULL will get returned.
+					 */
+					(yy_c_buf_p) = (yytext_ptr) + YY_MORE_ADJ;
+
+					yy_act = YY_STATE_EOF(YY_START);
+					goto do_action;
+					}
+
+				else
+					{
+					if ( ! (yy_did_buffer_switch_on_eof) )
+						YY_NEW_FILE;
+					}
+				break;
+				}
+
+			case EOB_ACT_CONTINUE_SCAN:
+				(yy_c_buf_p) =
+					(yytext_ptr) + yy_amount_of_matched_text;
+
+				yy_current_state = yy_get_previous_state(  );
+
+				yy_cp = (yy_c_buf_p);
+				yy_bp = (yytext_ptr) + YY_MORE_ADJ;
+				goto yy_match;
+
+			case EOB_ACT_LAST_MATCH:
+				(yy_c_buf_p) =
+				&YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)];
+
+				yy_current_state = yy_get_previous_state(  );
+
+				yy_cp = (yy_c_buf_p);
+				yy_bp = (yytext_ptr) + YY_MORE_ADJ;
+				goto yy_find_action;
+			}
+		break;
+		}
+
+	default:
+		YY_FATAL_ERROR(
+			"fatal flex scanner internal error--no action found" );
+	} /* end of action switch */
+		} /* end of scanning one token */
+} /* end of yylex */
+
+/* yy_get_next_buffer - try to read in a new buffer
+ *
+ * Returns a code representing an action:
+ *	EOB_ACT_LAST_MATCH -
+ *	EOB_ACT_CONTINUE_SCAN - continue scanning from current position
+ *	EOB_ACT_END_OF_FILE - end of file
+ */
+static int yy_get_next_buffer (void)
+{
+    	char *dest = YY_CURRENT_BUFFER_LVALUE->yy_ch_buf;
+	char *source = (yytext_ptr);
+	int number_to_move, i;
+	int ret_val;
+
+	if ( (yy_c_buf_p) > &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars) + 1] )
+		YY_FATAL_ERROR(
+		"fatal flex scanner internal error--end of buffer missed" );
+
+	if ( YY_CURRENT_BUFFER_LVALUE->yy_fill_buffer == 0 )
+		{ /* Don't try to fill the buffer, so this is an EOF. */
+		if ( (yy_c_buf_p) - (yytext_ptr) - YY_MORE_ADJ == 1 )
+			{
+			/* We matched a single character, the EOB, so
+			 * treat this as a final EOF.
+			 */
+			return EOB_ACT_END_OF_FILE;
+			}
+
+		else
+			{
+			/* We matched some text prior to the EOB, first
+			 * process it.
+			 */
+			return EOB_ACT_LAST_MATCH;
+			}
+		}
+
+	/* Try to read more data. */
+
+	/* First move last chars to start of buffer. */
+	number_to_move = (int) ((yy_c_buf_p) - (yytext_ptr)) - 1;
+
+	for ( i = 0; i < number_to_move; ++i )
+		*(dest++) = *(source++);
+
+	if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_EOF_PENDING )
+		/* don't do the read, it's not guaranteed to return an EOF,
+		 * just force an EOF
+		 */
+		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars) = 0;
+
+	else
+		{
+			yy_size_t num_to_read =
+			YY_CURRENT_BUFFER_LVALUE->yy_buf_size - number_to_move - 1;
+
+		while ( num_to_read <= 0 )
+			{ /* Not enough room in the buffer - grow it. */
+
+			/* just a shorter name for the current buffer */
+			YY_BUFFER_STATE b = YY_CURRENT_BUFFER_LVALUE;
+
+			int yy_c_buf_p_offset =
+				(int) ((yy_c_buf_p) - b->yy_ch_buf);
+
+			if ( b->yy_is_our_buffer )
+				{
+				yy_size_t new_size = b->yy_buf_size * 2;
+
+				if ( new_size <= 0 )
+					b->yy_buf_size += b->yy_buf_size / 8;
+				else
+					b->yy_buf_size *= 2;
+
+				b->yy_ch_buf = (char *)
+					/* Include room in for 2 EOB chars. */
+					yyrealloc((void *) b->yy_ch_buf,b->yy_buf_size + 2  );
+				}
+			else
+				/* Can't grow it, we don't own it. */
+				b->yy_ch_buf = 0;
+
+			if ( ! b->yy_ch_buf )
+				YY_FATAL_ERROR(
+				"fatal error - scanner input buffer overflow" );
+
+			(yy_c_buf_p) = &b->yy_ch_buf[yy_c_buf_p_offset];
+
+			num_to_read = YY_CURRENT_BUFFER_LVALUE->yy_buf_size -
+						number_to_move - 1;
+
+			}
+
+		if ( num_to_read > YY_READ_BUF_SIZE )
+			num_to_read = YY_READ_BUF_SIZE;
+
+		/* Read in more data. */
+		YY_INPUT( (&YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[number_to_move]),
+			(yy_n_chars), num_to_read );
+
+		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars);
+		}
+
+	if ( (yy_n_chars) == 0 )
+		{
+		if ( number_to_move == YY_MORE_ADJ )
+			{
+			ret_val = EOB_ACT_END_OF_FILE;
+			yyrestart(yyin  );
+			}
+
+		else
+			{
+			ret_val = EOB_ACT_LAST_MATCH;
+			YY_CURRENT_BUFFER_LVALUE->yy_buffer_status =
+				YY_BUFFER_EOF_PENDING;
+			}
+		}
+
+	else
+		ret_val = EOB_ACT_CONTINUE_SCAN;
+
+	if ((yy_size_t) ((yy_n_chars) + number_to_move) > YY_CURRENT_BUFFER_LVALUE->yy_buf_size) {
+		/* Extend the array by 50%, plus the number we really need. */
+		yy_size_t new_size = (yy_n_chars) + number_to_move + ((yy_n_chars) >> 1);
+		YY_CURRENT_BUFFER_LVALUE->yy_ch_buf = (char *) yyrealloc((void *) YY_CURRENT_BUFFER_LVALUE->yy_ch_buf,new_size  );
+		if ( ! YY_CURRENT_BUFFER_LVALUE->yy_ch_buf )
+			YY_FATAL_ERROR( "out of dynamic memory in yy_get_next_buffer()" );
+	}
+
+	(yy_n_chars) += number_to_move;
+	YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] = YY_END_OF_BUFFER_CHAR;
+	YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars) + 1] = YY_END_OF_BUFFER_CHAR;
+
+	(yytext_ptr) = &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[0];
+
+	return ret_val;
+}
+
+/* yy_get_previous_state - get the state just before the EOB char was reached */
+
+    static yy_state_type yy_get_previous_state (void)
+{
+	yy_state_type yy_current_state;
+	char *yy_cp;
+    
+	yy_current_state = (yy_start);
+
+	for ( yy_cp = (yytext_ptr) + YY_MORE_ADJ; yy_cp < (yy_c_buf_p); ++yy_cp )
+		{
+		YY_CHAR yy_c = (*yy_cp ? yy_ec[YY_SC_TO_UI(*yy_cp)] : 1);
+		if ( yy_accept[yy_current_state] )
+			{
+			(yy_last_accepting_state) = yy_current_state;
+			(yy_last_accepting_cpos) = yy_cp;
+			}
+		while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
+			{
+			yy_current_state = (int) yy_def[yy_current_state];
+			if ( yy_current_state >= 35 )
+				yy_c = yy_meta[(unsigned int) yy_c];
+			}
+		yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
+		}
+
+	return yy_current_state;
+}
+
+/* yy_try_NUL_trans - try to make a transition on the NUL character
+ *
+ * synopsis
+ *	next_state = yy_try_NUL_trans( current_state );
+ */
+    static yy_state_type yy_try_NUL_trans  (yy_state_type yy_current_state )
+{
+	int yy_is_jam;
+    	char *yy_cp = (yy_c_buf_p);
+
+	YY_CHAR yy_c = 1;
+	if ( yy_accept[yy_current_state] )
+		{
+		(yy_last_accepting_state) = yy_current_state;
+		(yy_last_accepting_cpos) = yy_cp;
+		}
+	while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
+		{
+		yy_current_state = (int) yy_def[yy_current_state];
+		if ( yy_current_state >= 35 )
+			yy_c = yy_meta[(unsigned int) yy_c];
+		}
+	yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
+	yy_is_jam = (yy_current_state == 34);
+
+		return yy_is_jam ? 0 : yy_current_state;
+}
+
+#ifndef YY_NO_INPUT
+#ifdef __cplusplus
+    static int yyinput (void)
+#else
+    static int input  (void)
+#endif
+
+{
+	int c;
+    
+	*(yy_c_buf_p) = (yy_hold_char);
+
+	if ( *(yy_c_buf_p) == YY_END_OF_BUFFER_CHAR )
+		{
+		/* yy_c_buf_p now points to the character we want to return.
+		 * If this occurs *before* the EOB characters, then it's a
+		 * valid NUL; if not, then we've hit the end of the buffer.
+		 */
+		if ( (yy_c_buf_p) < &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] )
+			/* This was really a NUL. */
+			*(yy_c_buf_p) = '\0';
+
+		else
+			{ /* need more input */
+			yy_size_t offset = (yy_c_buf_p) - (yytext_ptr);
+			++(yy_c_buf_p);
+
+			switch ( yy_get_next_buffer(  ) )
+				{
+				case EOB_ACT_LAST_MATCH:
+					/* This happens because yy_g_n_b()
+					 * sees that we've accumulated a
+					 * token and flags that we need to
+					 * try matching the token before
+					 * proceeding.  But for input(),
+					 * there's no matching to consider.
+					 * So convert the EOB_ACT_LAST_MATCH
+					 * to EOB_ACT_END_OF_FILE.
+					 */
+
+					/* Reset buffer status. */
+					yyrestart(yyin );
+
+					/*FALLTHROUGH*/
+
+				case EOB_ACT_END_OF_FILE:
+					{
+					if ( yywrap( ) )
+						return EOF;
+
+					if ( ! (yy_did_buffer_switch_on_eof) )
+						YY_NEW_FILE;
+#ifdef __cplusplus
+					return yyinput();
+#else
+					return input();
+#endif
+					}
+
+				case EOB_ACT_CONTINUE_SCAN:
+					(yy_c_buf_p) = (yytext_ptr) + offset;
+					break;
+				}
+			}
+		}
+
+	c = *(unsigned char *) (yy_c_buf_p);	/* cast for 8-bit char's */
+	*(yy_c_buf_p) = '\0';	/* preserve yytext */
+	(yy_hold_char) = *++(yy_c_buf_p);
+
+	return c;
+}
+#endif	/* ifndef YY_NO_INPUT */
+
+/** Immediately switch to a different input stream.
+ * @param input_file A readable stream.
+ * 
+ * @note This function does not reset the start condition to @c INITIAL .
+ */
+    void yyrestart  (FILE * input_file )
+{
+    
+	if ( ! YY_CURRENT_BUFFER ){
+        yyensure_buffer_stack ();
+		YY_CURRENT_BUFFER_LVALUE =
+            yy_create_buffer(yyin,YY_BUF_SIZE );
+	}
+
+	yy_init_buffer(YY_CURRENT_BUFFER,input_file );
+	yy_load_buffer_state( );
+}
+
+/** Switch to a different input buffer.
+ * @param new_buffer The new input buffer.
+ * 
+ */
+    void yy_switch_to_buffer  (YY_BUFFER_STATE  new_buffer )
+{
+    
+	/* TODO. We should be able to replace this entire function body
+	 * with
+	 *		yypop_buffer_state();
+	 *		yypush_buffer_state(new_buffer);
+     */
+	yyensure_buffer_stack ();
+	if ( YY_CURRENT_BUFFER == new_buffer )
+		return;
+
+	if ( YY_CURRENT_BUFFER )
+		{
+		/* Flush out information for old buffer. */
+		*(yy_c_buf_p) = (yy_hold_char);
+		YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = (yy_c_buf_p);
+		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars);
+		}
+
+	YY_CURRENT_BUFFER_LVALUE = new_buffer;
+	yy_load_buffer_state( );
+
+	/* We don't actually know whether we did this switch during
+	 * EOF (yywrap()) processing, but the only time this flag
+	 * is looked at is after yywrap() is called, so it's safe
+	 * to go ahead and always set it.
+	 */
+	(yy_did_buffer_switch_on_eof) = 1;
+}
+
+static void yy_load_buffer_state  (void)
+{
+    	(yy_n_chars) = YY_CURRENT_BUFFER_LVALUE->yy_n_chars;
+	(yytext_ptr) = (yy_c_buf_p) = YY_CURRENT_BUFFER_LVALUE->yy_buf_pos;
+	yyin = YY_CURRENT_BUFFER_LVALUE->yy_input_file;
+	(yy_hold_char) = *(yy_c_buf_p);
+}
+
+/** Allocate and initialize an input buffer state.
+ * @param file A readable stream.
+ * @param size The character buffer size in bytes. When in doubt, use @c YY_BUF_SIZE.
+ * 
+ * @return the allocated buffer state.
+ */
+    YY_BUFFER_STATE yy_create_buffer  (FILE * file, int  size )
+{
+	YY_BUFFER_STATE b;
+    
+	b = (YY_BUFFER_STATE) yyalloc(sizeof( struct yy_buffer_state )  );
+	if ( ! b )
+		YY_FATAL_ERROR( "out of dynamic memory in yy_create_buffer()" );
+
+	b->yy_buf_size = size;
+
+	/* yy_ch_buf has to be 2 characters longer than the size given because
+	 * we need to put in 2 end-of-buffer characters.
+	 */
+	b->yy_ch_buf = (char *) yyalloc(b->yy_buf_size + 2  );
+	if ( ! b->yy_ch_buf )
+		YY_FATAL_ERROR( "out of dynamic memory in yy_create_buffer()" );
+
+	b->yy_is_our_buffer = 1;
+
+	yy_init_buffer(b,file );
+
+	return b;
+}
+
+/** Destroy the buffer.
+ * @param b a buffer created with yy_create_buffer()
+ * 
+ */
+    void yy_delete_buffer (YY_BUFFER_STATE  b )
+{
+    
+	if ( ! b )
+		return;
+
+	if ( b == YY_CURRENT_BUFFER ) /* Not sure if we should pop here. */
+		YY_CURRENT_BUFFER_LVALUE = (YY_BUFFER_STATE) 0;
+
+	if ( b->yy_is_our_buffer )
+		yyfree((void *) b->yy_ch_buf  );
+
+	yyfree((void *) b  );
+}
+
+/* Initializes or reinitializes a buffer.
+ * This function is sometimes called more than once on the same buffer,
+ * such as during a yyrestart() or at EOF.
+ */
+    static void yy_init_buffer  (YY_BUFFER_STATE  b, FILE * file )
+
+{
+	int oerrno = errno;
+    
+	yy_flush_buffer(b );
+
+	b->yy_input_file = file;
+	b->yy_fill_buffer = 1;
+
+    /* If b is the current buffer, then yy_init_buffer was _probably_
+     * called from yyrestart() or through yy_get_next_buffer.
+     * In that case, we don't want to reset the lineno or column.
+     */
+    if (b != YY_CURRENT_BUFFER){
+        b->yy_bs_lineno = 1;
+        b->yy_bs_column = 0;
+    }
+
+        b->yy_is_interactive = file ? (isatty( fileno(file) ) > 0) : 0;
+    
+	errno = oerrno;
+}
+
+/** Discard all buffered characters. On the next scan, YY_INPUT will be called.
+ * @param b the buffer state to be flushed, usually @c YY_CURRENT_BUFFER.
+ * 
+ */
+    void yy_flush_buffer (YY_BUFFER_STATE  b )
+{
+    	if ( ! b )
+		return;
+
+	b->yy_n_chars = 0;
+
+	/* We always need two end-of-buffer characters.  The first causes
+	 * a transition to the end-of-buffer state.  The second causes
+	 * a jam in that state.
+	 */
+	b->yy_ch_buf[0] = YY_END_OF_BUFFER_CHAR;
+	b->yy_ch_buf[1] = YY_END_OF_BUFFER_CHAR;
+
+	b->yy_buf_pos = &b->yy_ch_buf[0];
+
+	b->yy_at_bol = 1;
+	b->yy_buffer_status = YY_BUFFER_NEW;
+
+	if ( b == YY_CURRENT_BUFFER )
+		yy_load_buffer_state( );
+}
+
+/** Pushes the new state onto the stack. The new state becomes
+ *  the current state. This function will allocate the stack
+ *  if necessary.
+ *  @param new_buffer The new state.
+ *  
+ */
+void yypush_buffer_state (YY_BUFFER_STATE new_buffer )
+{
+    	if (new_buffer == NULL)
+		return;
+
+	yyensure_buffer_stack();
+
+	/* This block is copied from yy_switch_to_buffer. */
+	if ( YY_CURRENT_BUFFER )
+		{
+		/* Flush out information for old buffer. */
+		*(yy_c_buf_p) = (yy_hold_char);
+		YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = (yy_c_buf_p);
+		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars);
+		}
+
+	/* Only push if top exists. Otherwise, replace top. */
+	if (YY_CURRENT_BUFFER)
+		(yy_buffer_stack_top)++;
+	YY_CURRENT_BUFFER_LVALUE = new_buffer;
+
+	/* copied from yy_switch_to_buffer. */
+	yy_load_buffer_state( );
+	(yy_did_buffer_switch_on_eof) = 1;
+}
+
+/** Removes and deletes the top of the stack, if present.
+ *  The next element becomes the new top.
+ *  
+ */
+void yypop_buffer_state (void)
+{
+    	if (!YY_CURRENT_BUFFER)
+		return;
+
+	yy_delete_buffer(YY_CURRENT_BUFFER );
+	YY_CURRENT_BUFFER_LVALUE = NULL;
+	if ((yy_buffer_stack_top) > 0)
+		--(yy_buffer_stack_top);
+
+	if (YY_CURRENT_BUFFER) {
+		yy_load_buffer_state( );
+		(yy_did_buffer_switch_on_eof) = 1;
+	}
+}
+
+/* Allocates the stack if it does not exist.
+ *  Guarantees space for at least one push.
+ */
+static void yyensure_buffer_stack (void)
+{
+	yy_size_t num_to_alloc;
+    
+	if (!(yy_buffer_stack)) {
+
+		/* First allocation is just for 2 elements, since we don't know if this
+		 * scanner will even need a stack. We use 2 instead of 1 to avoid an
+		 * immediate realloc on the next call.
+         */
+		num_to_alloc = 1;
+		(yy_buffer_stack) = (struct yy_buffer_state**)yyalloc
+								(num_to_alloc * sizeof(struct yy_buffer_state*)
+								);
+		if ( ! (yy_buffer_stack) )
+			YY_FATAL_ERROR( "out of dynamic memory in yyensure_buffer_stack()" );
+								  
+		memset((yy_buffer_stack), 0, num_to_alloc * sizeof(struct yy_buffer_state*));
+				
+		(yy_buffer_stack_max) = num_to_alloc;
+		(yy_buffer_stack_top) = 0;
+		return;
+	}
+
+	if ((yy_buffer_stack_top) >= ((yy_buffer_stack_max)) - 1){
+
+		/* Increase the buffer to prepare for a possible push. */
+		int grow_size = 8 /* arbitrary grow size */;
+
+		num_to_alloc = (yy_buffer_stack_max) + grow_size;
+		(yy_buffer_stack) = (struct yy_buffer_state**)yyrealloc
+								((yy_buffer_stack),
+								num_to_alloc * sizeof(struct yy_buffer_state*)
+								);
+		if ( ! (yy_buffer_stack) )
+			YY_FATAL_ERROR( "out of dynamic memory in yyensure_buffer_stack()" );
+
+		/* zero only the new slots.*/
+		memset((yy_buffer_stack) + (yy_buffer_stack_max), 0, grow_size * sizeof(struct yy_buffer_state*));
+		(yy_buffer_stack_max) = num_to_alloc;
+	}
+}
+
+/** Setup the input buffer state to scan directly from a user-specified character buffer.
+ * @param base the character buffer
+ * @param size the size in bytes of the character buffer
+ * 
+ * @return the newly allocated buffer state object. 
+ */
+YY_BUFFER_STATE yy_scan_buffer  (char * base, yy_size_t  size )
+{
+	YY_BUFFER_STATE b;
+    
+	if ( size < 2 ||
+	     base[size-2] != YY_END_OF_BUFFER_CHAR ||
+	     base[size-1] != YY_END_OF_BUFFER_CHAR )
+		/* They forgot to leave room for the EOB's. */
+		return 0;
+
+	b = (YY_BUFFER_STATE) yyalloc(sizeof( struct yy_buffer_state )  );
+	if ( ! b )
+		YY_FATAL_ERROR( "out of dynamic memory in yy_scan_buffer()" );
+
+	b->yy_buf_size = size - 2;	/* "- 2" to take care of EOB's */
+	b->yy_buf_pos = b->yy_ch_buf = base;
+	b->yy_is_our_buffer = 0;
+	b->yy_input_file = 0;
+	b->yy_n_chars = b->yy_buf_size;
+	b->yy_is_interactive = 0;
+	b->yy_at_bol = 1;
+	b->yy_fill_buffer = 0;
+	b->yy_buffer_status = YY_BUFFER_NEW;
+
+	yy_switch_to_buffer(b  );
+
+	return b;
+}
+
+/** Setup the input buffer state to scan a string. The next call to yylex() will
+ * scan from a @e copy of @a str.
+ * @param yystr a NUL-terminated string to scan
+ * 
+ * @return the newly allocated buffer state object.
+ * @note If you want to scan bytes that may contain NUL values, then use
+ *       yy_scan_bytes() instead.
+ */
+YY_BUFFER_STATE yy_scan_string (yyconst char * yystr )
+{
+    
+	return yy_scan_bytes(yystr,strlen(yystr) );
+}
+
+/** Setup the input buffer state to scan the given bytes. The next call to yylex() will
+ * scan from a @e copy of @a bytes.
+ * @param yybytes the byte buffer to scan
+ * @param _yybytes_len the number of bytes in the buffer pointed to by @a bytes.
+ * 
+ * @return the newly allocated buffer state object.
+ */
+YY_BUFFER_STATE yy_scan_bytes  (yyconst char * yybytes, yy_size_t  _yybytes_len )
+{
+	YY_BUFFER_STATE b;
+	char *buf;
+	yy_size_t n;
+	yy_size_t i;
+    
+	/* Get memory for full buffer, including space for trailing EOB's. */
+	n = _yybytes_len + 2;
+	buf = (char *) yyalloc(n  );
+	if ( ! buf )
+		YY_FATAL_ERROR( "out of dynamic memory in yy_scan_bytes()" );
+
+	for ( i = 0; i < _yybytes_len; ++i )
+		buf[i] = yybytes[i];
+
+	buf[_yybytes_len] = buf[_yybytes_len+1] = YY_END_OF_BUFFER_CHAR;
+
+	b = yy_scan_buffer(buf,n );
+	if ( ! b )
+		YY_FATAL_ERROR( "bad buffer in yy_scan_bytes()" );
+
+	/* It's okay to grow etc. this buffer, and we should throw it
+	 * away when we're done.
+	 */
+	b->yy_is_our_buffer = 1;
+
+	return b;
+}
+
+#ifndef YY_EXIT_FAILURE
+#define YY_EXIT_FAILURE 2
+#endif
+
+static void yy_fatal_error (yyconst char* msg )
+{
+    	(void) fprintf( stderr, "%s\n", msg );
+	exit( YY_EXIT_FAILURE );
+}
+
+/* Redefine yyless() so it works in section 3 code. */
+
+#undef yyless
+#define yyless(n) \
+	do \
+		{ \
+		/* Undo effects of setting up yytext. */ \
+        int yyless_macro_arg = (n); \
+        YY_LESS_LINENO(yyless_macro_arg);\
+		yytext[yyleng] = (yy_hold_char); \
+		(yy_c_buf_p) = yytext + yyless_macro_arg; \
+		(yy_hold_char) = *(yy_c_buf_p); \
+		*(yy_c_buf_p) = '\0'; \
+		yyleng = yyless_macro_arg; \
+		} \
+	while ( 0 )
+
+/* Accessor  methods (get/set functions) to struct members. */
+
+/** Get the current line number.
+ * 
+ */
+int yyget_lineno  (void)
+{
+        
+    return yylineno;
+}
+
+/** Get the input stream.
+ * 
+ */
+FILE *yyget_in  (void)
+{
+        return yyin;
+}
+
+/** Get the output stream.
+ * 
+ */
+FILE *yyget_out  (void)
+{
+        return yyout;
+}
+
+/** Get the length of the current token.
+ * 
+ */
+yy_size_t yyget_leng  (void)
+{
+        return yyleng;
+}
+
+/** Get the current token.
+ * 
+ */
+
+char *yyget_text  (void)
+{
+        return yytext;
+}
+
+/** Set the current line number.
+ * @param line_number
+ * 
+ */
+void yyset_lineno (int  line_number )
+{
+    
+    yylineno = line_number;
+}
+
+/** Set the input stream. This does not discard the current
+ * input buffer.
+ * @param in_str A readable stream.
+ * 
+ * @see yy_switch_to_buffer
+ */
+void yyset_in (FILE *  in_str )
+{
+        yyin = in_str ;
+}
+
+void yyset_out (FILE *  out_str )
+{
+        yyout = out_str ;
+}
+
+int yyget_debug  (void)
+{
+        return yy_flex_debug;
+}
+
+void yyset_debug (int  bdebug )
+{
+        yy_flex_debug = bdebug ;
+}
+
+static int yy_init_globals (void)
+{
+        /* Initialization is the same as for the non-reentrant scanner.
+     * This function is called from yylex_destroy(), so don't allocate here.
+     */
+
+    (yy_buffer_stack) = 0;
+    (yy_buffer_stack_top) = 0;
+    (yy_buffer_stack_max) = 0;
+    (yy_c_buf_p) = (char *) 0;
+    (yy_init) = 0;
+    (yy_start) = 0;
+
+/* Defined in main.c */
+#ifdef YY_STDINIT
+    yyin = stdin;
+    yyout = stdout;
+#else
+    yyin = (FILE *) 0;
+    yyout = (FILE *) 0;
+#endif
+
+    /* For future reference: Set errno on error, since we are called by
+     * yylex_init()
+     */
+    return 0;
+}
+
+/* yylex_destroy is for both reentrant and non-reentrant scanners. */
+int yylex_destroy  (void)
+{
+    
+    /* Pop the buffer stack, destroying each element. */
+	while(YY_CURRENT_BUFFER){
+		yy_delete_buffer(YY_CURRENT_BUFFER  );
+		YY_CURRENT_BUFFER_LVALUE = NULL;
+		yypop_buffer_state();
+	}
+
+	/* Destroy the stack itself. */
+	yyfree((yy_buffer_stack) );
+	(yy_buffer_stack) = NULL;
+
+    /* Reset the globals. This is important in a non-reentrant scanner so the next time
+     * yylex() is called, initialization will occur. */
+    yy_init_globals( );
+
+    return 0;
+}
+
+/*
+ * Internal utility routines.
+ */
+
+#ifndef yytext_ptr
+static void yy_flex_strncpy (char* s1, yyconst char * s2, int n )
+{
+	int i;
+	for ( i = 0; i < n; ++i )
+		s1[i] = s2[i];
+}
+#endif
+
+#ifdef YY_NEED_STRLEN
+static int yy_flex_strlen (yyconst char * s )
+{
+	int n;
+	for ( n = 0; s[n]; ++n )
+		;
+
+	return n;
+}
+#endif
+
+void *yyalloc (yy_size_t  size )
+{
+	return (void *) malloc( size );
+}
+
+void *yyrealloc  (void * ptr, yy_size_t  size )
+{
+	/* The cast to (char *) in the following accommodates both
+	 * implementations that use char* generic pointers, and those
+	 * that use void* generic pointers.  It works with the latter
+	 * because both ANSI C and C++ allow castless assignment from
+	 * any pointer type to void*, and deal with argument conversions
+	 * as though doing an assignment.
+	 */
+	return (void *) realloc( (char *) ptr, size );
+}
+
+void yyfree (void * ptr )
+{
+	free( (char *) ptr );	/* see yyrealloc() for (char *) cast */
+}
+
+#define YYTABLES_NAME "yytables"
+
+
+
+
+int32_t
+number(void)
+{
+	long l;
+
+	errno = 0;
+	l = strtol(yytext, NULL, 0);
+	if (((l == LONG_MAX || l == LONG_MIN) && errno == ERANGE) ||
+	    l > INT32_MAX || l < INT32_MIN) {
+		m4_warnx("numeric overflow in expr: %s", yytext);
+	}
+	return l;
+}
+
+int32_t
+parse_radix(void)
+{
+	long base;
+	char *next;
+	long l;
+	int d;
+
+	l = 0;
+	base = strtol(yytext+2, &next, 0);
+	if (base > 36 || next == NULL) {
+		m4_warnx("error in number %s", yytext);
+	} else {
+		next++;
+		while (*next != 0) {
+			if (*next >= '0' && *next <= '9')
+				d = *next - '0';
+			else if (*next >= 'a' && *next <= 'z')
+				d = *next - 'a' + 10;
+			else {
+				assert(*next >= 'A' && *next <= 'Z');
+				d = *next - 'A' + 10;
+			}
+			if (d >= base) {
+				m4_warnx("error in number %s", yytext);
+				return 0;
+			}
+			l = base * l + d;
+			next++;
+		}
+	}
+	return l;
+}
+
+
diff --git a/tools/build/cross-build/fake_chflags/Makefile b/tools/build/cross-build/fake_chflags/Makefile
new file mode 100644
index 0000000000000..c4559be0e7784
--- /dev/null
+++ b/tools/build/cross-build/fake_chflags/Makefile
@@ -0,0 +1,7 @@
+# $FreeBSD$
+
+NO_OBJ=
+SCRIPTS=	chflags
+BINDIR=		/usr/bin
+
+.include <bsd.prog.mk>
\ No newline at end of file
diff --git a/tools/build/cross-build/fake_chflags/chflags b/tools/build/cross-build/fake_chflags/chflags
new file mode 100644
index 0000000000000..cd9becba5112f
--- /dev/null
+++ b/tools/build/cross-build/fake_chflags/chflags
@@ -0,0 +1,42 @@
+#!/bin/sh -e
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright 2018-2020 Alex Richardson <arichardson@FreeBSD.org>
+#
+# This software was developed by SRI International and the University of
+# Cambridge Computer Laboratory (Department of Computer Science and
+# Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the
+# DARPA SSITH research programme.
+#
+# This software was developed by SRI International and the University of
+# Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
+# ("CTSRD"), as part of the DARPA CRASH research programme.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+#
+# chflags doesn't exist on Linux, just skip the calls for now
+# TODO: we could also create a wrapper that calls `chattr +i` for `chflags schg`, etc
+echo "WARNING: Ignoring chflags $@"
+# TODO: exit 1
diff --git a/usr.bin/m4/Makefile b/usr.bin/m4/Makefile
index e722d014eebf8..b9d89bd20dab1 100644
--- a/usr.bin/m4/Makefile
+++ b/usr.bin/m4/Makefile
@@ -12,13 +12,21 @@ LIBADD=	m openbsd
 
 NO_WMISSING_VARIABLE_DECLARATIONS=
 
-SRCS=	eval.c expr.c look.c main.c misc.c gnum4.c trace.c parser.y tokenizer.l
-
+SRCS=	eval.c expr.c look.c main.c misc.c gnum4.c trace.c parser.y
+.if target(bootstrap_m4_tokenizer)
+# When crossbuilding on non-FreeBSD we need to first build m4 with pre-generated
+# tokenizer files and the build the real m4 once we have lex+yacc.
+SRCS+=	tokenizer.c
+.else
+SRCS+=	tokenizer.l
+.endif
+
+GENFILES=	tokenizer.c parser.c parser.h
 WARNS=	3
 
 tokenizer.o: parser.h
 
-CLEANFILES+=	parser.c parser.h tokenizer.o
+CLEANFILES+=	parser.c parser.h tokenizer.o tokenizer.c
 
 HAS_TESTS=
 SUBDIR.${MK_TESTS}+= tests