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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: cebdb73745 ("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
This commit is contained in:
Jean-Philippe Brucker 2022-02-01 09:31:20 +00:00 committed by Daniel Borkmann
parent e2bcbd7769
commit b7892f7d5c
1 changed files with 1 additions and 1 deletions
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2
tools/scripts/Makefile.include
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@ -90,7 +90,7 @@ EXTRA_WARNINGS += -Wstrict-aliasing=3
else ifneq ($(CROSS_COMPILE),)
CLANG_CROSS_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%))
GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)gcc))
GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)gcc 2>/dev/null))
ifneq ($(GCC_TOOLCHAIN_DIR),)
CLANG_CROSS_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
CLANG_CROSS_FLAGS += --sysroot=$(shell $(CROSS_COMPILE)gcc -print-sysroot)