[MacPorts] #28182: gst-ffmpeg fails to build when using i386 arch and 10.5 target

[MacPorts]

#28182: gst-ffmpeg fails to build when using i386 arch and 10.5 target
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 Reporter:  andres.colubri@…                     |       Owner:  macports-tickets@…                   
     Type:  defect                               |      Status:  new                                  
 Priority:  Normal                               |   Milestone:                                       
Component:  ports                                |     Version:  1.9.2                                
 Keywords:  gstreamer, ffmpeg, build error, asm  |        Port:                                       
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 Hello, when trying to install the gst-ffmpeg package on Snow Leopard 64
 bits, but using i386 as the build architecture and 10.5 as the deployment
 target, the build stage fails with this error:

 :info:build CC  libavcodec/h264_cabac.o
 :info:build libavcodec/cabac.h: In function 'get_cabac_noinline':
 :info:build libavcodec/cabac.h:527: error: PIC register '%ebx' clobbered
 in 'asm'
 ...

 (full error log is attached)

 I should also note that in order to generate valid 32 bits binaries for
 10.5 when compiling from OSX 10.6 64 bits, I changed the default LD flags
 in <prefix>/share/macports/Tcl/port1.0/portconfigure.tcl as:

 default configure.ldflags   {"-L${prefix}/lib -Xlinker
 -headerpad_max_install_names -mmacosx-version-min=10.5
 -no_compact_linkedit"}

 I don't know if this influencing the occurrence of the error. Anyways, a
 solution I found to this problem was to add the the following post-
 configure step in the portfile of gst-ffmpeg:

 post-configure {
     if { $build_arch == "i386" } {
         reinplace "s|HAVE_EBX_AVAILABLE 1|HAVE_EBX_AVAILABLE 0|g" \
             ${worksrcpath}/gst-libs/ext/ffmpeg/config.h
     }
 }

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Ticket URL: <https://trac.macports.org/ticket/28182>
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