gecko-dev/build/autoconf/toolchain.m4

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dnl This Source Code Form is subject to the terms of the Mozilla Public
dnl License, v. 2.0. If a copy of the MPL was not distributed with this
dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
AC_DEFUN([MOZ_TOOL_VARIABLES],
[
GNU_AS=
GNU_LD=
GNU_CC=
GNU_CXX=
CC_VERSION='N/A'
CXX_VERSION='N/A'
if test "$GCC" = "yes"; then
GNU_CC=1
CC_VERSION=`$CC -v 2>&1 | grep 'gcc version'`
fi
if test "$GXX" = "yes"; then
GNU_CXX=1
CXX_VERSION=`$CXX -v 2>&1 | grep 'gcc version'`
changequote(<<,>>)
GCC_VERSION_FULL=`echo "$CXX_VERSION" | $PERL -pe 's/^.*gcc version ([^ ]*).*/<<$>>1/'`
GCC_VERSION=`echo "$GCC_VERSION_FULL" | $PERL -pe '(split(/\./))[0]>=4&&s/(^\d*\.\d*).*/<<$>>1/;'`
GCC_MAJOR_VERSION=`echo ${GCC_VERSION} | $AWK -F\. '{ print <<$>>1 }'`
GCC_MINOR_VERSION=`echo ${GCC_VERSION} | $AWK -F\. '{ print <<$>>2 }'`
changequote([,])
fi
if test "`echo | $AS -o conftest.out -v 2>&1 | grep -c GNU`" != "0"; then
GNU_AS=1
fi
rm -f conftest.out
if test "`echo | $LD -v 2>&1 | grep -c GNU`" != "0"; then
GNU_LD=1
fi
if test "$GNU_CC"; then
if `$CC -print-prog-name=ld` -v 2>&1 | grep -c GNU >/dev/null; then
GCC_USE_GNU_LD=1
fi
fi
INTEL_CC=
INTEL_CXX=
if test "$GCC" = yes; then
if test "`$CC -help 2>&1 | grep -c 'Intel(R) C++ Compiler'`" != "0"; then
INTEL_CC=1
fi
fi
if test "$GXX" = yes; then
if test "`$CXX -help 2>&1 | grep -c 'Intel(R) C++ Compiler'`" != "0"; then
INTEL_CXX=1
fi
fi
CLANG_CC=
CLANG_CXX=
if test "$GCC" = yes; then
if test "`$CC -v 2>&1 | egrep -c '(clang version|Apple.*clang)'`" != "0"; then
CLANG_CC=1
fi
fi
if test "$GXX" = yes; then
if test "`$CXX -v 2>&1 | egrep -c '(clang version|Apple.*clang)'`" != "0"; then
CLANG_CXX=1
fi
fi
AC_SUBST(CLANG_CXX)
])