libyuv @20220812_0: getting "no such instruction" for many AVX instructions

[Cebtenzzre]

I am unable to build libyuv on Tiger 10.4.8 with Xcode 2.5. It's apparently trying to use AVX instructions that the assembler does not recognize. The port is using gcc 7 which is the newest compiler I've been able to get working, since I've also had trouble building clang-11-bootstrap.

$ sudo port install libyuv build.jobs=1
--->  Computing dependencies for libyuv
--->  Fetching archive for libyuv
--->  Attempting to fetch libyuv-20220812_0.darwin_8.i386.tbz2 from http://packages.macports.org/libyuv
--->  Attempting to fetch libyuv-20220812_0.darwin_8.i386.tbz2 from http://ywg.ca.packages.macports.org/mirror/macports/packages/libyuv
--->  Attempting to fetch libyuv-20220812_0.darwin_8.i386.tbz2 from http://mirror.fcix.net/macports/packages/libyuv
--->  Fetching distfiles for libyuv
--->  Verifying checksums for libyuv
--->  Extracting libyuv
--->  Applying patches to libyuv
--->  Configuring libyuv
--->  Building libyuv
Error: Failed to build libyuv: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_multimedia_libyuv/libyuv/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets if you believe there is a bug.
Error: Processing of port libyuv failed

This is a small part of main.log, it goes on for a while. The full log is attached.

:info:build FAILED: CMakeFiles/yuv.dir/source/row_gcc.cc.o 
:info:build /opt/local/bin/g++-mp-7 -DHAVE_JPEG -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_multimedia_libyuv/libyuv/work/libyuv-20220812/include -I/opt/local/include -pipe -Os -DNDEBUG -I/opt/local/include -D_GLIBCXX_USE_CXX11_ABI=0 -arch i386 -mmacosx-version-min=10.4 -std=gnu++11 -MD -MT CMakeFiles/yuv.dir/source/row_gcc.cc.o -MF CMakeFiles/yuv.dir/source/row_gcc.cc.o.d -o CMakeFiles/yuv.dir/source/row_gcc.cc.o -c /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_multimedia_libyuv/libyuv/work/libyuv-20220812/source/row_gcc.cc
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_multimedia_libyuv/libyuv/work/libyuv-20220812/source/row_gcc.cc:595:no such instruction: `vbroadcastf128 __ZN6libyuvL23kShuffleMaskARGBToRGB24E-L7$pb(%eax),%ymm6'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_multimedia_libyuv/libyuv/work/libyuv-20220812/source/row_gcc.cc:596:no such instruction: `vmovdqa __ZN6libyuvL15kPermdRGB24_AVXE-L7$pb(%eax),%ymm7'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_multimedia_libyuv/libyuv/work/libyuv-20220812/source/row_gcc.cc:598:no such instruction: `vmovdqu (%edx),%ymm0'