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conf: use better clang detection

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Handle case where compiler isn't called 'clang'. This is slightly
modified from the version here:
http://src.chromium.org/svn/branches/1312/src/third_party/mesa/MesaLib/configure.ac

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
This commit is contained in:
Noah Watkins 2013-11-06 14:32:35 -08:00
parent f5514654e0
commit afb3566b18
1 changed files with 10 additions and 1 deletions
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11
configure.ac
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@ -61,7 +61,16 @@ if test "$CXX" = no || test "$CXX:$GXX" = "g++:"; then
AC_MSG_ERROR([no C++ compiler found])
fi
AM_CONDITIONAL(CLANG, test x"$CXX" = x"clang++")
AC_MSG_CHECKING([if compiler is clang])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[
#ifndef __clang__
#error "Not Clang"
#endif
return 0;
]])],
[CLANG=yes], [CLANG=no])
AC_MSG_RESULT([$CLANG])
AM_CONDITIONAL(CLANG, test "$CLANG" = "yes")
#AC_PROG_CC
AC_PROG_MAKE_SET