Commit 61e8d5df authored by thoughtpolice's avatar thoughtpolice

Better detection of clang in ./configure. Issue #7678.

Signed-off-by: thoughtpolice's avatarAustin Seipp <aseipp@pobox.com>
parent ae06df63
......@@ -1136,19 +1136,30 @@ AC_SUBST(GccLT34)
AC_SUBST(GccLT46)
])# FP_GCC_VERSION
dnl Check to see if the C compiler uses an LLVM back end
dnl Check to see if the C compiler is clang or llvm-gcc
dnl
AC_DEFUN([FP_CC_LLVM_BACKEND],
[AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING([whether C compiler has an LLVM back end])
AC_MSG_CHECKING([whether C compiler is clang])
$CC -x c /dev/null -dM -E > conftest.txt 2>&1
if grep "__llvm__" conftest.txt >/dev/null 2>&1; then
if grep "__clang__" conftest.txt >/dev/null 2>&1; then
AC_SUBST([CC_CLANG_BACKEND], [1])
AC_SUBST([CC_LLVM_BACKEND], [1])
AC_MSG_RESULT([yes])
else
AC_SUBST([CC_LLVM_BACKEND], [0])
AC_MSG_RESULT([no])
AC_MSG_CHECKING([whether C compiler has an LLVM back end])
if grep "__llvm__" conftest.txt >/dev/null 2>&1; then
AC_SUBST([CC_CLANG_BACKEND], [0])
AC_SUBST([CC_LLVM_BACKEND], [1])
AC_MSG_RESULT([yes])
else
AC_SUBST([CC_CLANG_BACKEND], [0])
AC_SUBST([CC_LLVM_BACKEND], [0])
AC_MSG_RESULT([no])
fi
fi
rm -f conftest.txt
])
......
......@@ -986,8 +986,14 @@ echo ["\
"]
fi
if test "$CC_CLANG_BACKEND" = "1"; then
CNAME="clang "
else
CNAME="gcc "
fi
echo ["\
Using GCC : $WhatGccIsCalled
Using $CNAME : $WhatGccIsCalled
which is version : $GccVersion
Building a cross compiler : $CrossCompiling
......
......@@ -46,6 +46,10 @@ NO_INCLUDE_PKGDATA = NO
# Should we build latex docs?
LATEX_DOCS = NO
# Is the global compiler clang, llvm, or something neither?
CC_CLANG_BACKEND = @CC_CLANG_BACKEND@
CC_LLVM_BACKEND = @CC_LLVM_BACKEND@
# Mac OS X deployment target (to cross-compile for older OS versions)
#
MACOSX_DEPLOYMENT_VERSION = @MACOSX_DEPLOYMENT_VERSION@
......
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