Fix #112 (unconditional march=native causes illegal instructions when distributing binaries) by adding control over -march/-mtune compiler flags#123
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…l -march=native -mtune=native with configurable options to prevent crashes when deploying to machines with different CPU capabilities than the build host. Add FFMPEG_MARCH/FFMPEG_MTUNE env vars (highest priority) and build-portable feature flag for portable builds. Default behaviour is preserved for backwards compatibility. Fixes zmwangx#112
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build.rscurrently unconditionally adds-march=native -mtune=nativewhich breaks for CI systems, since the FFmpeg build is tuned for the CI runner's CPU capabilities, which are often more advanced than the target systems.I've added the
build-portablefeature flag, and updated the unconditional logic as follows:This would fix #112