• Arnaldo Carvalho de Melo's avatar
    tools build: Use the same CC for feature detection and actual build · c8c18867
    Arnaldo Carvalho de Melo authored
    	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.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    c8c18867
Makefile 7.52 KB