• Steven Rostedt's avatar
    objtool: Fix Makefile to properly see if libelf is supported · c2bb9e32
    Steven Rostedt authored
    When doing a make allmodconfig, I hit the following compile error:
    
      In file included from builtin-check.c:32:0:
      elf.h:22:18: fatal error: gelf.h: No such file or directory
      compilation terminated.
      ...
    
    Digging into it, it appears that the $(shell ..) command in the Makefile does
    not give the proper result when it fails to find -lelf, and continues to
    compile objtool.
    
    Instead, use the "try-run" makefile macro to perform the test. This gives a
    proper result for both cases.
    Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
    Acked-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
    Cc: Bernd Petrovitsch <bernd@petrovitsch.priv.at>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Chris J Arges <chris.j.arges@canonical.com>
    Cc: Jiri Slaby <jslaby@suse.cz>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Michal Marek <mmarek@suse.cz>
    Cc: Namhyung Kim <namhyung@gmail.com>
    Cc: Pedro Alves <palves@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: live-patching@vger.kernel.org
    Fixes: 442f04c3 ("objtool: Add tool to perform compile-time stack metadata validation")
    Link: http://lkml.kernel.org/r/20160420153234.GA24032@home.goodmis.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    c2bb9e32
Makefile 55 KB