Can't build. Maybe wrong c/c++ mode? use of undeclared identifier '__builtin_ia32_paddsb128'

[nemui-i]

I can't build currently,

This will fail:

cargo new test2 && cd test2
cargo add mozangle
cargo build

I also can't build servo, because mozangle fails, which is how I got here:

The following warnings were emitted during compilation:

warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated [-Wdeprecated]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]
warning: [email protected]: clang: warning: argument unused during compilation: '-arch:SSE2' [-Wunused-command-line-argument]

  --- stderr
  /usr/lib/llvm-14/lib/clang/14.0.0/include/emmintrin.h:2228:19: error: use of undeclared identifier '__builtin_ia32_paddsb128'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/emmintrin.h:2250:19: error: use of undeclared identifier '__builtin_ia32_paddsw128'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/emmintrin.h:2271:19: error: use of undeclared identifier '__builtin_ia32_paddusb128'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/emmintrin.h:2292:19: error: use of undeclared identifier '__builtin_ia32_paddusw128'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/emmintrin.h:2670:19: error: use of undeclared identifier '__builtin_ia32_psubsb128'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/emmintrin.h:2691:19: error: use of undeclared identifier '__builtin_ia32_psubsw128'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/emmintrin.h:2711:19: error: use of undeclared identifier '__builtin_ia32_psubusb128'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/emmintrin.h:2731:19: error: use of undeclared identifier '__builtin_ia32_psubusw128'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/avx2intrin.h:95:19: error: use of undeclared identifier '__builtin_ia32_paddsb256'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/avx2intrin.h:101:19: error: use of undeclared identifier '__builtin_ia32_paddsw256'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/avx2intrin.h:107:19: error: use of undeclared identifier '__builtin_ia32_paddusb256'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/avx2intrin.h:113:19: error: use of undeclared identifier '__builtin_ia32_paddusw256'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/avx2intrin.h:631:19: error: use of undeclared identifier '__builtin_ia32_psubsb256'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/avx2intrin.h:637:19: error: use of undeclared identifier '__builtin_ia32_psubsw256'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/avx2intrin.h:643:19: error: use of undeclared identifier '__builtin_ia32_psubusb256'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/avx2intrin.h:649:19: error: use of undeclared identifier '__builtin_ia32_psubusw256'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/avx512fintrin.h:9319:10: error: use of undeclared identifier '__builtin_ia32_reduce_add_q512'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/avx512fintrin.h:9323:10: error: use of undeclared identifier '__builtin_ia32_reduce_mul_q512'
  /usr/lib/llvm-14/lib/clang/14.0.0/include/avx512fintrin.h:9337:10: error: use of undeclared identifier '__builtin_ia32_reduce_add_q512'
  fatal error: too many errors emitted, stopping now [-ferror-limit=]

I have no clue about anything and looking up this message I found this thread saying it's maybe because of c files being compiled in c++ mode? Which is maybe related to #38 It would also fit the message from above: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated

If I'm missing some package it would be great if that could be added to the README, since I can't figure out what it is from the error message.

[sagudev]

You can ignore warnings. From what I recall, missing __builtin_* are due to clang mismatch. In CI we used https://github.com/servo/servo/blob/f2882879d8d345c62d8d1d076485af6280e54dde/.github/workflows/linux.yml#L81, but generally the best idea is to make sure you have only one clang and that it is new enough (preferably same version as used by rustc).

[nemui-i]

Thank you a lot for the help!

LIBCLANG_PATH=/usr/lib/llvm-14/lib cargo build

This works!