From: Yonghong Song yhs@fb.com
commit f62700ce63a315b4607cc9e97aa15ea409a677b9 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: Yonghong Song yhs@fb.com Signed-off-by: Alexei 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: Greg Kroah-Hartman gregkh@linuxfoundation.org --- tools/scripts/Makefile.include | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
--- a/tools/scripts/Makefile.include +++ b/tools/scripts/Makefile.include @@ -39,8 +39,6 @@ EXTRA_WARNINGS += -Wundef EXTRA_WARNINGS += -Wwrite-strings EXTRA_WARNINGS += -Wformat
-CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?) - # Makefiles suck: This macro sets a default value of $(2) for the # variable named by $(1), unless the variable has been set by # environment or command line. This is necessary for CC and AR @@ -52,12 +50,22 @@ define allow-override $(eval $(1) = $(2))) endef
+ifneq ($(LLVM),) +$(call allow-override,CC,clang) +$(call allow-override,AR,llvm-ar) +$(call allow-override,LD,ld.lld) +$(call allow-override,CXX,clang++) +$(call allow-override,STRIP,llvm-strip) +else # Allow setting various cross-compile vars or setting CROSS_COMPILE as a prefix. $(call allow-override,CC,$(CROSS_COMPILE)gcc) $(call allow-override,AR,$(CROSS_COMPILE)ar) $(call allow-override,LD,$(CROSS_COMPILE)ld) $(call allow-override,CXX,$(CROSS_COMPILE)g++) $(call allow-override,STRIP,$(CROSS_COMPILE)strip) +endif + +CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?)
ifneq ($(LLVM),) HOSTAR ?= llvm-ar