tools: Allow proper CC/CXX/... override with LLVM=1 in Makefile.include
stable inclusion from stable-5.10.55 commit 475312897ea6b4b9a9a56c838aec6370c42f7315 bugzilla: 175636 https://gitee.com/openeuler/kernel/issues/I4DYWD Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=475312897ea6b4b9a9a56c838aec6370c42f7315 -------------------------------- commit f62700ce upstream. selftests/bpf/Makefile includes tools/scripts/Makefile.include. With the following command make -j60 LLVM=1 LLVM_IAS=1 <=== compile kernel make -j60 -C tools/testing/selftests/bpf LLVM=1 LLVM_IAS=1 V=1 some files are still compiled with gcc. This patch fixed the case if CC/AR/LD/CXX/STRIP is allowed to be overridden, it will be written to clang/llvm-ar/..., instead of gcc binaries. The definition of CC_NO_CLANG is also relocated to the place after the above CC is defined. Signed-off-by: NYonghong Song <yhs@fb.com> Signed-off-by: NAlexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210413153419.3028165-1-yhs@fb.com Cc: Anders Roxell <anders.roxell@linaro.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NChen Jun <chenjun102@huawei.com> Acked-by: NWeilong Chen <chenweilong@huawei.com> Signed-off-by: NChen Jun <chenjun102@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
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