• Mikulas Patocka's avatar
    objtool: Fix 64-bit build on 32-bit host · 14c47b54
    Mikulas Patocka authored
    The new ORC unwinder breaks the build of a 64-bit kernel on a 32-bit
    host.  Building the kernel on a i386 or x32 host fails with:
    
      orc_dump.c: In function 'orc_dump':
      orc_dump.c:105:26: error: passing argument 2 of 'elf_getshdrnum' from incompatible pointer type [-Werror=incompatible-pointer-types]
        if (elf_getshdrnum(elf, &nr_sections)) {
                                ^
      In file included from /usr/local/include/gelf.h:32:0,
                       from elf.h:22,
                       from warn.h:26,
                       from orc_dump.c:20:
      /usr/local/include/libelf.h:304:12: note: expected 'size_t * {aka unsigned int *}' but argument is of type 'long unsigned int *'
       extern int elf_getshdrnum (Elf *__elf, size_t *__dst);
                  ^~~~~~~~~~~~~~
      orc_dump.c:190:17: error: format '%lx' expects argument of type 'long unsigned int', but argument 3 has type 'Elf64_Sxword {aka long long int}' [-Werror=format=]
          printf("%s+%lx:", name, rela.r_addend);
                     ~~^          ~~~~~~~~~~~~~
                     %llx
    
    Fix the build failure.
    
    Another problem is that if the user specifies HOSTCC or HOSTLD
    variables, they are ignored in the objtool makefile.  Change the
    Makefile to respect these variables.
    Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
    Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Sven Joachim <svenjoac@gmx.de>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Fixes: 627fce14 ("objtool: Add ORC unwind table generation")
    Link: http://lkml.kernel.org/r/19f0e64d8e07e30a7b307cd010eb780c404fe08d.1512252895.git.jpoimboe@redhat.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    14c47b54
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