ffmpeg 0.7.1 fails to build on a Yonah (ie 32bit) XCode 4.0 machine

[macports@…]

Attempting to build ffmpeg-0.7.1 eventually results in an error :info:build fatal error: error in backend: Ran out of registers during register allocation! while trying to compile libavcodec/h264_cabac.c (Presumably this occurs when trying to compile the huge function at the bottom of that file.)

Possible fixes might be to attempt to compile that single file as -O2 rather than -O3, or to allow some of forced inline functions to not be inline.

Details are: This is a Yonah Macbook (MacBook1,1 Core Duo, NOT Core 2 Duo) Running OSX 10.6.8. Compiling using XCode 4.0. For obvious reasons, this machine will not be moving on to 10.7 and XCode 4.1.

I've attached the build log.

[macports@…]

Log file from the failed build

[mf2k (Frank Schima)]

Error is:

:info:build /Developer/usr/bin/clang -I. -I"/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_multimedia_ffmpeg/ffmpeg/work/ffmpeg-0.7.1" -I/opt/local/include -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -DHAVE_AV_CONFIG_H -pipe -O2 -DHAVE_LRINTF -I/opt/local/include -arch i386   -std=c99 -fomit-frame-pointer -fPIC -I/opt/local/include/dirac -I/opt/local/include/schroedinger-1.0 -I/opt/local/include/orc-0.4 -D_GNU_SOURCE=1 -D_THREAD_SAFE -I/opt/local/include/SDL -g -Wdeclaration-after-statement -Wall -Wno-parentheses -Wno-switch -Wdisabled-optimization -Wpointer-arith -Wredundant-decls -Wno-pointer-sign -Wcast-qual -Wwrite-strings -Wtype-limits -Wundef -Wmissing-prototypes -Wno-pointer-to-int-cast -O3 -fno-math-errno -fno-signed-zeros -mllvm -stack-alignment=16 -Qunused-arguments  -MMD -c -o libavcodec/h264_loopfilter.o libavcodec/h264_loopfilter.c
:info:build fatal error: error in backend: Ran out of registers during register allocation!
:info:build gmake: *** [libavcodec/h264_cabac.o] Error 1

[jmroot (Joshua Root)]

#30602