make targets

This produces a list of currently supported targets.  Here "supported"
means "built in make universe" on the theory that those targets are
more supported than any that might work in 'make buildworld TARGET=x
TARGET_ARCH=y' since the latter are less tested.

Suggested by: rwatson

1 files changed, 10 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 5f16914731c96..a674c90cf0218 100644
--- a/Makefile
+++ b/Makefile
@@ -26,6 +26,7 @@
 # delete-old-dirs     - Delete obsolete directories.
 # delete-old-files    - Delete obsolete files.
 # delete-old-libs     - Delete obsolete libraries.
+# targets             - Print a list of supported TARGET/TARGET_ARCH pairs.
 #
 # This makefile is simple by design. The FreeBSD make automatically reads
 # the /usr/share/mk/sys.mk unless the -m argument is specified on the
@@ -280,7 +281,7 @@ tinderbox:
 # with a reasonable chance of success, regardless of how old your
 # existing system is.
 #
-.if make(universe) || make(universe_kernels) || make(tinderbox)
+.if make(universe) || make(universe_kernels) || make(tinderbox) || make(targets)
 TARGETS?=amd64 arm i386 ia64 mips pc98 powerpc sparc64 sun4v
 TARGET_ARCHES_arm?=	arm armeb
 TARGET_ARCHES_mips?=	mipsel mipseb mips64el mips64eb
@@ -291,6 +292,14 @@ TARGET_ARCHES_sun4v?=	sparc64
 TARGET_ARCHES_${target}?= ${target}
 .endfor
 
+targets:
+	@echo "Supported TARGET/TARGET_ARCH pairs"
+.for target in ${TARGETS}
+.for target_arch in ${TARGET_ARCHES_${target}}
+	@echo "    ${target}/${target_arch}"
+.endfor
+.endfor
+
 .if defined(DOING_TINDERBOX)
 FAILFILE=tinderbox.failed
 MAKEFAIL=tee -a ${FAILFILE}