`error: Unknown Clang option: '--'`

[GregoryConrad]

Just started getting this in my CI within the last few days:

ERROR: warning: zstd-sys@2.0.13+zstd.1.5.6: error: Unknown Clang option: '--'
warning: zstd-sys@2.0.13+zstd.1.5.6: ToolExecError: Command LC_ALL="C" "/home/runner/.cache/cargo-zigbuild/0.19.7/zigcc-aarch64-unknown-linux-gnu-aef7.sh" "-O3" "-ffunction-sections" "-fdata-sections" "-fPIC" "--target=aarch64-unknown-linux-gnu" "-I" "zstd/lib/" "-I" "zstd/lib/common" "-I" "zstd/lib/legacy" "-fvisibility=hidden" "-DZSTD_LIB_DEPRECATED=0" "-DXXH_PRIVATE_API=" "-DZSTDLIB_VISIBILITY=" "-DZDICTLIB_VISIBILITY=" "-DZSTDERRORLIB_VISIBILITY=" "-DZSTD_LEGACY_SUPPORT=1" "-o" "/home/runner/work/mimir/mimir/target/aarch64-unknown-linux-gnu/release/build/zstd-sys-d59ad57382408c09/out/44ff4c55aa9e5133-debug.o" "-c" "--" "zstd/lib/common/debug.c" with args zigcc-aarch64-unknown-linux-gnu-aef7.sh did not execute successfully (status code exit status: 1).cargo:warning=error: Unknown Clang option: '--'

And many duplicate/similar warnings. Any ideas here? Thanks in advance.

[EAimTY]

I encountered this error recently while building ring 0.17.8 from arm64 macos to x86_64-unknown-linux-gnu.2.36 with homebrew clang. My temporary work around is to use https://github.com/messense/homebrew-macos-cross-toolchains and manually set export CC_x86_64_unknown_linux_gnu=x86_64-linux-gnu-gcc

[GregoryConrad]

Thanks for the idea, but this error is happening to me an Ubuntu GitHub actions runner

[NobodyXu]

I've just fixed it in rust-lang/cc-rs#1364, would cut a release in cc soon within today