[FFmpeg-trac] #4474(build system:new): Some inline asm code does not compile on Haiku 32-bit with GCC 4

[FFmpeg]

#4474: Some inline asm code does not compile on Haiku 32-bit with GCC 4
-------------------------------------+-------------------------------------
               Reporter:             |                  Owner:
  Timothy_Gu                         |                 Status:  new
                   Type:  defect     |              Component:  build
               Priority:  normal     |  system
                Version:  git-       |               Keywords:  haiku
  master                             |               Blocking:
             Blocked By:             |  Analyzed by developer:  0
Reproduced by developer:  0          |
-------------------------------------+-------------------------------------
 == Summary of the bug ==

 FFmpeg does not compile on Haiku 32-bit out-of-the-box.

 == How to reproduce ==

 Clone FFmpeg.

 Configure with `--enable-gpl` (but that shouldn't matter).

 Make.

 {{{
 CC      libavfilter/x86/vf_noise.o
 libavfilter/x86/vf_noise.c: In function 'line_noise_avg_mmx':
 libavfilter/x86/vf_noise.c:62:5: error: 'asm' operand has impossible
 constraints
      __asm__ volatile(
      ^
 make: *** [libavfilter/x86/vf_noise.o] Error 1
 }}}

 == Workarounds ==

 1. Configure with `--disable-inline-asm`
 2. Manually define `HAVE_6REGS` or `HAVE_EBP_AVAILABLE` to 0.
 3. Manually set `CFLAGS` to `-fno-PIC` (Haiku uses PIC by default so to
 disable it one has to explicitly add `-fno-PIC`)

 == Interesting parts in `config.log` ==

 {{{
 check_ld cc
 check_cc
 BEGIN /tmp/ffconf.uJdXoo5E.c
     1   #include <signal.h>
     2   static void sighandler(int sig){
     3       raise(SIGTERM);
     4   }
     5   int foo(void){
     6       volatile int i=0;
     7   __asm__ volatile ("xorl %%ebp, %%ebp" ::: "%ebp");
     8   return i;
     9   }
    10   int (*func_ptr)(void) = foo;
    11   int main(void){
    12       signal(SIGILL, sighandler);
    13       signal(SIGFPE, sighandler);
    14       signal(SIGSEGV, sighandler);
    15   #ifdef SIGBUS
    16       signal(SIGBUS, sighandler);
    17   #endif
    18       return func_ptr();
    19   }
 END /tmp/ffconf.uJdXoo5E.c
 gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC
 -std=c99 -fomit-frame-pointer -fPIC -c -o /tmp/ffconf.47o9YaJR.o
 /tmp/ffconf.uJdXoo5E.c
 gcc -o /tmp/ffconf.L9dLDbtf /tmp/ffconf.47o9YaJR.o
 check_inline_asm ebx_available ""::"b"(0)
 check_cc
 BEGIN /tmp/ffconf.uJdXoo5E.c
     1   void foo(void){ __asm__ volatile(""::"b"(0)); }
 END /tmp/ffconf.uJdXoo5E.c
 gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC
 -std=c99 -fomit-frame-pointer -fPIC -c -o /tmp/ffconf.47o9YaJR.o
 /tmp/ffconf.uJdXoo5E.c
 /tmp/ffconf.uJdXoo5E.c: In function 'foo':
 /tmp/ffconf.uJdXoo5E.c:1:17: error: inconsistent operand constraints in an
 'asm'
  void foo(void){ __asm__ volatile(""::"b"(0)); }
                  ^
 }}}

 == Compiler version ==

 {{{
 gcc (2014_12_21) 4.8.4
 Copyright (C) 2013 Free Software Foundation, Inc.
 }}}

 == Patches should be submitted to the ffmpeg-devel mailing list and not
 this bug tracker. ==

 I know.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4474>
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