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authorArnaldo Carvalho de Melo <acme@redhat.com>2017-03-02 16:00:26 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-03-03 19:07:19 -0300
commitc8c188679ccfc86d9c7bac57ecf4b8205a061a06 (patch)
tree3f665b2ebb5e1cb712b934a1106b40be72a8b371
parenta0f213e14bb5cf4f190809b5811e1292bd614899 (diff)
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tools build: Use the same CC for feature detection and actual build
When build with: 'make CC=clang' we were not using that CC to do feature detection, which resulted in features being detected with gcc and then the actual tools being built with clang. Most of the time these compilers are compatible enough, so no problem was being noticed. As soon as a system with an old enough clang, one that hasn't the cpuid.h header is used, and a gcc with it, the "get_cpuid" feature will be found available but then code that will use can't be compiled. Noticed with this combination: / $ gcc --version | head -1 gcc (Alpine 6.3.0) 6.3.0 / $ clang --version | head -1 clang version 3.8.1 (tags/RELEASE_381/final) / $ cat /etc/alpine-release 3.5.0 / $ Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-60q18nvlvgpyfv7e2qqgx4ou@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/build/feature/Makefile4
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index ab1e2bbc2e96..09c9626ea666 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -53,8 +53,8 @@ FILES= \
FILES := $(addprefix $(OUTPUT),$(FILES))
-CC := $(CROSS_COMPILE)gcc -MD
-CXX := $(CROSS_COMPILE)g++ -MD
+CC ?= $(CROSS_COMPILE)gcc -MD
+CXX ?= $(CROSS_COMPILE)g++ -MD
PKG_CONFIG := $(CROSS_COMPILE)pkg-config
LLVM_CONFIG ?= llvm-config