tools: Ignore errors from `which' when searching a GCC toolchain
When cross-building tools with clang, we run `which $(CROSS_COMPILE)gcc` to detect whether a GCC toolchain provides the standard libraries. It is only a helper because some distros put libraries where LLVM does not automatically find them. On other systems, LLVM detects the libc automatically and does not need this. There, it is completely fine not to have a GCC at all, but some versions of `which' display an error when the command is not found: which: no aarch64-linux-gnu-gcc in ($PATH) Since the error can safely be ignored, throw it to /dev/null. Fixes: cebdb737 ("tools: Help cross-building with clang") Reported-by:Nathan Chancellor <nathan@kernel.org> Signed-off-by:
Jean-Philippe Brucker <jean-philippe@linaro.org> Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Tested-by:
Nathan Chancellor <nathan@kernel.org> Reviewed-by:
Nathan Chancellor <nathan@kernel.org> Link: https://lore.kernel.org/bpf/20220201093119.1713207-1-jean-philippe@linaro.org
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