linux/tools/objtool
Josh Poimboeuf 60cbdf5d05 tools build: Fix objtool build with ARCH=x86_64
The objtool build fails in a cross-compiled environment on a non-x86
host with "ARCH=x86_64":

  tools/objtool/objtool-in.o: In function `decode_instructions':
  tools/objtool/builtin-check.c:276: undefined reference to `arch_decode_instruction'

We could override the ARCH environment variable and change it back to
x86, similar to what the objtool Makefile was doing before; but it's
tricky to override environment variables consistently.

Instead, take a similar approach used by the Linux top-level Makefile
and introduce a SRCARCH Makefile variable which evaluates to "x86" when
ARCH is either "x86_64" or "x86".

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20160722191920.ej62fnspnqurbaa7@treble
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2016-07-22 16:37:44 -03:00
..
arch/x86 x86/asm/decoder: Use explicitly signed chars 2016-03-03 16:13:00 +01:00
Documentation objtool: Detect falling through to the next function 2016-04-16 11:14:17 +02:00
.gitignore objtool: Add tool to perform compile-time stack metadata validation 2016-02-29 08:35:12 +01:00
arch.h objtool: Add tool to perform compile-time stack metadata validation 2016-02-29 08:35:12 +01:00
Build tools build: Fix objtool build with ARCH=x86_64 2016-07-22 16:37:44 -03:00
builtin-check.c objtool: Initialize variable to silence old compiler 2016-07-15 17:32:52 -03:00
builtin.h objtool: Add tool to perform compile-time stack metadata validation 2016-02-29 08:35:12 +01:00
elf.c objtool: Add fallback from ELF_C_READ_MMAP to ELF_C_READ 2016-07-13 15:38:50 -03:00
elf.h objtool: Allow building with older libelf 2016-05-17 10:42:46 +02:00
Makefile tools build: Fix objtool build with ARCH=x86_64 2016-07-22 16:37:44 -03:00
objtool.c objtool: Add tool to perform compile-time stack metadata validation 2016-02-29 08:35:12 +01:00
special.c objtool: Add tool to perform compile-time stack metadata validation 2016-02-29 08:35:12 +01:00
special.h objtool: Add tool to perform compile-time stack metadata validation 2016-02-29 08:35:12 +01:00
warn.h objtool: Add tool to perform compile-time stack metadata validation 2016-02-29 08:35:12 +01:00