FreeBSD source tree https://cgit-dev.freebsd.org/src/atom?h=release%2F10.4.0 2012-04-20T21:00:39Z 2012-04-20T21:00:39Z Dimitry Andric dim@FreeBSD.org 2012-04-20T21:00:39Z urn:sha1:d2cc835cb5cec80295ee4234f5562e65d48368fd way: first they are compiled to assembly, then some sed'ing is done on the assembly, and lastly the assembly is compiled to an object file. This last step is done using ${CC}, and not ${AS}, because when the compiler is clang, it outputs directives that are too advanced for our old gas. So we use clang's integrated assembler instead. (When the compiler is gcc, it just calls gas, and nothing is different, except one extra fork.) However, in the .s to .o rules in lib/csu/$ARCH/Makefile, I still passed CFLAGS to the compiler, instead of ACFLAGS, which are specifically for compiling .s files. In case you are using '-g' for debug info anywhere in your CFLAGS, it causes the .s files to already contain debug information in the assembly itself. In the next step, the .s files are also compiled using '-g', and if the compiler is clang, it complains: "error: input can't have .file dwarf directives when -g is used to generate dwarf debug info for assembly code". Fix this by using ${ACFLAGS} for compiling the .s files instead. Reported by: jasone MFC after: 1 week 2011-01-13T20:44:31Z Dimitry Andric dim@FreeBSD.org 2011-01-13T20:44:31Z urn:sha1:9ef4e3afcb2e1d7c7a2e3aa77d02e802654d96da generated from lib/csu/common/crtbrand.c (which ultimately ends up in executables and shared libraries, via crt1.o, gcrt1.o or Scrt1.o). For all arches except sparc, gcc emits the section directive for the abitag struct in crtbrand.c with a PROGBITS type. However, newer versions of binutils (after 2.16.90) require the section to be of NOTE type, to guarantee that the .note.ABI-tag section correctly ends up in the first page of the final executable. Unfortunately, there is no clean way to tell gcc to use another section type, so crtbrand.c (or the C files that include it) must be compiled in multiple steps: - Compile the .c file to a .s file. - Edit the .s file to change the 'progbits' type to 'note', for the section directive that defines the .note.ABI-tag section. - Compile the .s file to an object file. These steps are done in the invididual Makefiles for each applicable arch. Reviewed by: kib 2010-12-10T08:53:06Z Tijl Coosemans tijl@FreeBSD.org 2010-12-10T08:53:06Z urn:sha1:b0032ab5f881cc57ae716d1c1c1eac5c14e64bab in crt1.o. On other architectures crtbrand.c is included from crt1.c, but that's not a C source code file on ia64. Instead it is compiled separately and included in crt1.o using incremental linking. Tested by: dim (previous version) Approved by: kib (mentor) 2010-12-09T21:31:21Z Dimitry Andric dim@FreeBSD.org 2010-12-09T21:31:21Z urn:sha1:cbbcfbf8b769db75e99f7423e6d4ed6f8b7eb5ea macro for identification, instead of several different hand-rolled variants (plain .ident, .ascii, etc). 2010-10-15T21:40:20Z Dimitry Andric dim@FreeBSD.org 2010-10-15T21:40:20Z urn:sha1:73438aeedcb73ccc06a7ebd04d7709800ca8c447 This allows it to assemble with newer binutils. Reviewed by: marcel 2010-03-05T13:29:05Z Ulrich Spörlein uqs@FreeBSD.org 2010-03-05T13:29:05Z urn:sha1:03dab16e1d96c59d081bf3af34a0cdcaf0bcc9fc PR: bin/140089 Reviewed by: jmallett Approved by: ed (co-mentor) 2009-12-02T16:34:20Z Konstantin Belousov kib@FreeBSD.org 2009-12-02T16:34:20Z urn:sha1:c09ba32715e4d6f9339259b872375bca77f59d37 Scrt1.o instead of crt1.o, since the later is built as non-PIC. Separate i386-elf crt1.c into the pure assembler part and C code, supplying all data extracted by assembler stub as explicit parameters [1]. Hide and localize _start1 symbol used as an interface between asm and C code. In collaboration with: kan Inspired by: PR i386/127387 [1] Prodded and tested by: rdivacky [1] MFC after: 3 weeks 2004-08-18T23:06:47Z Marcel Moolenaar marcel@FreeBSD.org 2004-08-18T23:06:47Z urn:sha1:e8e41d4cf89ccf226820df248b5b77b7554e2866 GP register, because it's clobbered for calls across load modules. The previous commit inserted the call to _init_tls() between the call to atexit() and the restoration of the GP register clobbered by it. Fix: restore GP before we call _init_tls(). Pointy hat: dfr@ 2004-08-15T16:18:52Z Doug Rabson dfr@FreeBSD.org 2004-08-15T16:18:52Z urn:sha1:ccd13c49b55616e3f92a3cf37512dc24aeb41e0a 2003-07-15T03:50:38Z Marcel Moolenaar marcel@FreeBSD.org 2003-07-15T03:50:38Z urn:sha1:29cc06cf27d0fe8b7c9423bacb05464c2ed964c9 Trust me.