Parallel builds sometimes cause race conditions in assembly generation

BB Issue #1025
**Original issue created by pxnguyen (bitbucket username :pxnguyen).**
*Created on Bitbucket: 2026-01-21*
*Last updated on Bitbucket: 2026-01-27*


We’ve observed race conditions building x265 on AWS Graviton hosts in which we’ve occasionally seen link failures due to undefined references. We build it as part of a ‘superbuild’, so this can be somewhat time consuming if we have to restart it.

Attached is a proposed patch to resolve this. 

With the aid of Claude Opus LLM, we believe we’ve found a race condition in that none of the final targets rely on the generated `ASM_OBJS` list structure in CMake; as a result. This has the effect in which multiple library targets will independently rebuild assembly subtargets, and step over each other; it’s possible for final link to attempt to link against an incompletely-written target:

```
[ 64%] Generating asm.S.o
[ 64%] Generating asm.S.o
[ 64%] Generating blockcopy8-common.S.o
[ 64%] Generating blockcopy8-common.S.o
[ 64%] Generating blockcopy8.S.o
[ 64%] Generating blockcopy8.S.o
[ 64%] Generating ssd-neon-dotprod.S.o
[ 64%] Generating ssd-neon-dotprod.S.o
[ 67%] Generating dct.S.o
[ 67%] Generating dct.S.o
[ 67%] Generating intrapred.S.o
[ 69%] Generating intrapred.S.o
[ 69%] Generating mc-a-common.S.o
[ 70%] Generating mc-a-common.S.o
[ 71%] Generating mc-a.S.o
[ 74%] Generating mc-a.S.o
[ 74%] Generating p2s-common.S.o
[ 74%] Generating p2s.S.o
[ 76%] Generating p2s-common.S.o
[ 76%] Generating pixel-util-common.S.o
[ 77%] Generating pixel-util.S.o
[ 78%] Generating p2s.S.o
[ 79%] Generating sad-a.S.o
[ 80%] Generating sad-neon-dotprod.S.o
[ 82%] Generating pixel-util-common.S.o
[ 82%] Generating ssd-a-common.S.o
[ 83%] Generating pixel-util.S.o
[ 84%] Generating ssd-a.S.o
[ 85%] Generating sad-a.S.o
[ 86%] Generating sad-neon-dotprod.S.o
[ 88%] Generating ssd-a-common.S.o
[ 88%] Generating ssd-a.S.o
```

‌

Our wrapper superbuild code generates this cmake command on Amazon Linux 2023. We presently target Graviton 2 and the Apple M1 as our baseline.

```
cmake3 "/sd/workspace/src/git/org/build/_scm/libx265/source"
  -DCMAKE_INSTALL_PREFIX=/opt/org/libx265/4.1
  -DCMAKE_INSTALL_LIBDIR:PATH=lib 
  -DCMAKE_INSTALL_BINDIR:PATH=bin 
  -DCMAKE_INSTALL_INCLUDEDIR:PATH=include 
  -DCMAKE_BUILD_TYPE=RelWithDebInfo 
  -DCMAKE_COLOR_MAKEFILE=ON 
  -DCMAKE_COLOR_DIAGNOSTICS=ON 
  -DCLICOLOR_FORCE=1 
  -DCMAKE_VERBOSE_MAKEFILE=ON 
  -DCMAKE_INCLUDE_FLAG_C="-I" 
  -DCMAKE_INCLUDE_FLAG_CXX="-I" 
  -DCMAKE_INCLUDE_SYSTEM_FLAG_C="-isystem" 
  -DCMAKE_INCLUDE_SYSTEM_FLAG_CXX="-isystem" 
  -DCMAKE_C_FLAGS="-O2 -ggdb -Wextra -fdiagnostics-color=always -grecord-gcc-switches -frecord-gcc-switches -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -march=armv8.2-a+crypto+dotprod+rcpc+fp16 -moutline-atomics" 
  -DCMAKE_CXX_FLAGS="-O2 -ggdb -Wextra -fdiagnostics-color=always -grecord-gcc-switches -frecord-gcc-switches -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -march=armv8.2-a+crypto+dotprod+rcpc+fp16 -moutline-atomics -std=c++17" 
  -DCMAKE_SHARED_LINKER_FLAGS="-Wl,--as-needed -Wl,--no-undefined -Wl,-rpath='\$ORIGIN/../lib',--enable-new-dtags -Wl,-rpath-link=/sd/workspace/src/git/org/build/_sdk/release_posix-aarch64_gcc_11/numactl_2.0.19/lib" 
  -DCMAKE_EXE_LINKER_FLAGS="-Wl,--as-needed -Wl,--no-undefined -Wl,-rpath='\$ORIGIN/../lib',--enable-new-dtags -Wl,-rpath-link=/sd/workspace/src/git/org/build/_sdk/release_posix-aarch64_gcc_11/numactl_2.0.19/lib" 
  -DCMAKE_CXX_COMPILER=/usr/bin/g++ 
  -DCMAKE_C_COMPILER=/usr/bin/gcc
  -DNUMA_ROOT_DIR=/sd/workspace/src/git/org/build/_build/build_release_posix-aarch64_gcc_11/numactl/destdir/opt/org/numactl/2.0 
  -DENABLE_NEON_DOTPROD=ON 
  -DENABLE_NEON_I8MM=OFF 
  -DENABLE_SVE=OFF 
  -DENABLE_SVE2=OFF
```

‌

Example `undefined reference` error below:

```
[ 89%] Linking CXX static library libx265.a
/usr/bin/cmake -P CMakeFiles/x265-static.dir/cmake_clean_target.cmake
/usr/bin/cmake -E cmake_link_script CMakeFiles/x265-static.dir/link.txt --verbose=1
/usr/bin/ar qc libx265.a encoder/CMakeFiles/encoder.dir/analysis.cpp.o encoder/CMakeFiles/encoder.dir/search.cpp.o encoder/CMakeFiles/encoder.dir/bitcost.cpp.o encoder/CMakeFiles/encoder.dir/motion.cpp.o encoder/CMakeFiles/encoder.dir/slicetype.cpp.o encoder/CMakeFiles/encoder.dir/frameencoder.cpp.o encoder/CMakeFiles/encoder.dir/framefilter.cpp.o encoder/CMakeFiles/encoder.dir/level.cpp.o encoder/CMakeFiles/encoder.dir/nal.cpp.o encoder/CMakeFiles/encoder.dir/sei.cpp.o encoder/CMakeFiles/encoder.dir/sao.cpp.o encoder/CMakeFiles/encoder.dir/entropy.cpp.o encoder/CMakeFiles/encoder.dir/dpb.cpp.o encoder/CMakeFiles/encoder.dir/ratecontrol.cpp.o encoder/CMakeFiles/encoder.dir/reference.cpp.o encoder/CMakeFiles/encoder.dir/encoder.cpp.o encoder/CMakeFiles/encoder.dir/api.cpp.o encoder/CMakeFiles/encoder.dir/weightPrediction.cpp.o common/CMakeFiles/common.dir/aarch64/asm-primitives.cpp.o common/CMakeFiles/common.dir/aarch64/pixel-prim.cpp.o common/CMakeFiles/common.dir/aarch64/filter-prim.cpp.o common/CMakeFiles/common.dir/aarch64/dct-prim.cpp.o common/CMakeFiles/common.dir/aarch64/loopfilter-prim.cpp.o common/CMakeFiles/common.dir/aarch64/intrapred-prim.cpp.o common/CMakeFiles/common.dir/aarch64/arm64-utils.cpp.o common/CMakeFiles/common.dir/aarch64/sao-prim.cpp.o common/CMakeFiles/common.dir/aarch64/filter-neon-dotprod.cpp.o common/CMakeFiles/common.dir/primitives.cpp.o common/CMakeFiles/common.dir/pixel.cpp.o common/CMakeFiles/common.dir/dct.cpp.o common/CMakeFiles/common.dir/lowpassdct.cpp.o common/CMakeFiles/common.dir/ipfilter.cpp.o common/CMakeFiles/common.dir/intrapred.cpp.o common/CMakeFiles/common.dir/loopfilter.cpp.o common/CMakeFiles/common.dir/constants.cpp.o common/CMakeFiles/common.dir/cpu.cpp.o common/CMakeFiles/common.dir/version.cpp.o common/CMakeFiles/common.dir/threading.cpp.o common/CMakeFiles/common.dir/threadpool.cpp.o common/CMakeFiles/common.dir/wavefront.cpp.o common/CMakeFiles/common.dir/md5.cpp.o common/CMakeFiles/common.dir/bitstream.cpp.o common/CMakeFiles/common.dir/yuv.cpp.o common/CMakeFiles/common.dir/shortyuv.cpp.o common/CMakeFiles/common.dir/picyuv.cpp.o common/CMakeFiles/common.dir/common.cpp.o common/CMakeFiles/common.dir/param.cpp.o common/CMakeFiles/common.dir/frame.cpp.o common/CMakeFiles/common.dir/framedata.cpp.o common/CMakeFiles/common.dir/cudata.cpp.o common/CMakeFiles/common.dir/slice.cpp.o common/CMakeFiles/common.dir/lowres.cpp.o common/CMakeFiles/common.dir/piclist.cpp.o common/CMakeFiles/common.dir/predict.cpp.o common/CMakeFiles/common.dir/scalinglist.cpp.o common/CMakeFiles/common.dir/quant.cpp.o common/CMakeFiles/common.dir/deblock.cpp.o common/CMakeFiles/common.dir/scaler.cpp.o common/CMakeFiles/common.dir/ringmem.cpp.o common/CMakeFiles/common.dir/temporalfilter.cpp.o asm.S.o mc-a.S.o mc-a-common.S.o sad-a.S.o pixel-util.S.o pixel-util-common.S.o p2s.S.o p2s-common.S.o blockcopy8.S.o blockcopy8-common.S.o ssd-a.S.o ssd-a-common.S.o intrapred.S.o dct.S.o sad-neon-dotprod.S.o ssd-neon-dotprod.S.o
/usr/bin/ld: common/CMakeFiles/common.dir/aarch64/asm-primitives.cpp.o: in function `x265::setupNeonPrimitives(x265::EncoderPrimitives&)':
/sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xee4): undefined reference to `x265_pixel_sad_4x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xf58): undefined reference to `x265_pixel_sad_32x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xf68): undefined reference to `x265_pixel_sad_8x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xf80): undefined reference to `x265_pixel_sad_4x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xf90): undefined reference to `x265_pixel_sad_4x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0xf94): undefined reference to `x265_sad_x3_8x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xf9c): undefined reference to `x265_pixel_sad_8x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xfa8): undefined reference to `x265_pixel_sad_8x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xfac): undefined reference to `x265_pixel_sad_32x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xfb4): undefined reference to `x265_pixel_sad_16x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xfc0): undefined reference to `x265_pixel_sad_64x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xfc8): undefined reference to `x265_pixel_sad_32x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xfd0): undefined reference to `x265_pixel_sad_16x12_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xfdc): undefined reference to `x265_pixel_sad_12x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xfe4): undefined reference to `x265_pixel_sad_16x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xfec): undefined reference to `x265_pixel_sad_4x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xff4): undefined reference to `x265_pixel_sad_32x24_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0xffc): undefined reference to `x265_pixel_sad_24x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1004): undefined reference to `x265_pixel_sad_32x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x100c): undefined reference to `x265_pixel_sad_8x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1014): undefined reference to `x265_pixel_sad_64x48_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x101c): undefined reference to `x265_pixel_sad_48x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1024): undefined reference to `x265_pixel_sad_64x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x102c): undefined reference to `x265_pixel_sad_16x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1034): undefined reference to `x265_sad_x3_64x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x103c): undefined reference to `x265_pixel_sad_16x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1044): undefined reference to `x265_pixel_sad_32x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1048): undefined reference to `x265_pixel_sad_64x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1050): undefined reference to `x265_pixel_sad_64x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1054): undefined reference to `x265_pixel_sad_16x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x105c): undefined reference to `x265_sad_x4_64x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1060): undefined reference to `x265_pixel_sad_16x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1068): undefined reference to `x265_pixel_sad_16x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x106c): undefined reference to `x265_sad_x3_64x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x107c): undefined reference to `x265_pixel_sad_8x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1080): undefined reference to `x265_pixel_sad_4x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1088): undefined reference to `x265_pixel_sad_8x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1090): undefined reference to `x265_pixel_sad_16x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1098): undefined reference to `x265_sad_x3_8x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x109c): undefined reference to `x265_pixel_sad_32x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x10a4): undefined reference to `x265_sad_x3_16x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x10a8): undefined reference to `x265_pixel_sad_8x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x10b0): undefined reference to `x265_sad_x3_32x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x10bc): undefined reference to `x265_sad_x3_16x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x10c8): undefined reference to `x265_sad_x3_16x12_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x10cc): undefined reference to `x265_pixel_sad_64x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x10d4): undefined reference to `x265_sad_x3_4x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x10dc): undefined reference to `x265_sad_x3_32x24_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x10e4): undefined reference to `x265_sad_x3_4x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x10ec): undefined reference to `x265_sad_x3_12x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x10f4): undefined reference to `x265_sad_x3_16x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x10fc): undefined reference to `x265_sad_x3_32x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1100): undefined reference to `x265_pixel_sad_32x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1108): undefined reference to `x265_sad_x3_32x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x110c): undefined reference to `x265_pixel_sad_64x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1110): undefined reference to `x265_pixel_sad_64x48_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1118): undefined reference to `x265_sad_x3_48x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x111c): undefined reference to `x265_pixel_sad_16x12_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1124): undefined reference to `x265_sad_x3_8x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1128): undefined reference to `x265_sad_x3_8x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1130): undefined reference to `x265_sad_x3_4x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1134): undefined reference to `x265_sad_x3_4x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x113c): undefined reference to `x265_sad_x3_64x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1140): undefined reference to `x265_pixel_sad_12x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1148): undefined reference to `x265_sad_x3_16x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x114c): undefined reference to `x265_pixel_sad_16x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1154): undefined reference to `x265_sad_x3_32x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1158): undefined reference to `x265_pixel_sad_4x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1160): undefined reference to `x265_sad_x4_4x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1164): undefined reference to `x265_pixel_sad_32x24_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x116c): undefined reference to `x265_sad_x4_32x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1170): undefined reference to `x265_pixel_sad_24x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1178): undefined reference to `x265_sad_x4_24x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x117c): undefined reference to `x265_pixel_sad_32x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1184): undefined reference to `x265_sad_x4_16x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1188): undefined reference to `x265_pixel_sad_8x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1190): undefined reference to `x265_sad_x4_8x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x1194): undefined reference to `x265_pixel_sad_48x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x119c): undefined reference to `x265_sad_x4_12x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:541:(.text+0x11a0): undefined reference to `x265_pixel_sad_16x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x11ac): undefined reference to `x265_sad_x3_16x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x11b4): undefined reference to `x265_sad_x4_8x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x11bc): undefined reference to `x265_sad_x4_64x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x11c0): undefined reference to `x265_sad_x3_32x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x11c8): undefined reference to `x265_sad_x3_16x12_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x11cc): undefined reference to `x265_sad_x3_12x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x11d8): undefined reference to `x265_sad_x3_64x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x11e0): undefined reference to `x265_sad_x3_8x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x11e4): undefined reference to `x265_sad_x3_8x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x11ec): undefined reference to `x265_sad_x3_24x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x11f0): undefined reference to `x265_sad_x3_4x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x11f8): undefined reference to `x265_sad_x4_64x48_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x11fc): undefined reference to `x265_sad_x3_16x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1208): undefined reference to `x265_sad_x3_8x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1210): undefined reference to `x265_sad_x4_32x24_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1214): undefined reference to `x265_sad_x3_16x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1220): undefined reference to `x265_sad_x3_32x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1228): undefined reference to `x265_sad_x4_48x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x122c): undefined reference to `x265_sad_x3_64x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1238): undefined reference to `x265_sad_x3_32x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1244): undefined reference to `x265_sad_x3_4x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1250): undefined reference to `x265_sad_x3_32x24_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1258): undefined reference to `x265_sad_x3_16x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1268): undefined reference to `x265_sad_x3_24x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1278): undefined reference to `x265_sad_x3_32x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1284): undefined reference to `x265_sad_x3_64x48_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1288): undefined reference to `x265_sad_x3_8x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x128c): undefined reference to `x265_sad_x3_64x48_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x1294): undefined reference to `x265_sad_x3_48x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x12a0): undefined reference to `x265_sad_x3_64x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x12ac): undefined reference to `x265_sad_x3_16x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:542:(.text+0x12b0): undefined reference to `x265_sad_x3_16x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x12b8): undefined reference to `x265_sad_x4_4x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x12bc): undefined reference to `x265_sad_x4_4x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x12c4): undefined reference to `x265_sad_x4_8x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x12c8): undefined reference to `x265_sad_x4_8x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x12d0): undefined reference to `x265_sad_x4_16x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x12dc): undefined reference to `x265_sad_x4_32x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x12e0): undefined reference to `x265_sad_x4_4x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x12e8): undefined reference to `x265_sad_x4_64x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x12ec): undefined reference to `x265_sad_x4_64x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x12f4): undefined reference to `x265_sad_x4_8x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x12f8): undefined reference to `x265_sad_x4_8x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1300): undefined reference to `x265_sad_x4_16x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1304): undefined reference to `x265_sad_x4_32x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x130c): undefined reference to `x265_sad_x4_16x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1310): undefined reference to `x265_sad_x4_16x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x131c): undefined reference to `x265_sad_x4_8x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1328): undefined reference to `x265_sad_x4_16x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1330): undefined reference to `x265_sad_x4_32x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x133c): undefined reference to `x265_sad_x4_32x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1344): undefined reference to `x265_sad_x4_32x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1348): undefined reference to `x265_sad_x4_12x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x134c): undefined reference to `x265_sad_x4_32x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1354): undefined reference to `x265_sad_x4_16x12_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1358): undefined reference to `x265_sad_x4_16x12_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1360): undefined reference to `x265_sad_x4_32x24_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x136c): undefined reference to `x265_sad_x4_16x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1370): undefined reference to `x265_sad_x4_8x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x137c): undefined reference to `x265_sad_x4_4x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1380): undefined reference to `x265_sad_x4_64x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1388): undefined reference to `x265_sad_x4_64x48_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x1390): undefined reference to `x265_sad_x4_48x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x139c): undefined reference to `x265_sad_x4_64x16_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x13a8): undefined reference to `x265_sad_x4_16x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x13ac): undefined reference to `x265_sad_x4_16x64_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x13b4): undefined reference to `x265_sad_x4_16x4_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x13c4): undefined reference to `x265_sad_x4_24x32_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x13d0): undefined reference to `x265_sad_x4_32x8_neon'
/usr/bin/ld: /sd/workspace/src/git/org/build/_scm/libx265/source/common/aarch64/asm-primitives.cpp:543:(.text+0x13dc): undefined reference to `x265_sad_x4_4x16_neon'
/usr/bin/ranlib libx265.a
collect2: error: ld returned 1 exit status
```

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[0001-Add-explicit-dependencies-on-build-ASM_OBJS-to-avoid.patch](https://github.com/user-attachments/files/26927437/0001-Add-explicit-dependencies-on-build-ASM_OBJS-to-avoid.patch)

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Parallel builds sometimes cause race conditions in assembly generation #777

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Parallel builds sometimes cause race conditions in assembly generation #777

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