michael@0: dnl This Source Code Form is subject to the terms of the Mozilla Public
michael@0: dnl License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0: dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
michael@0: 
michael@0: dnl check if the build is using lto. This is really primitive and only detects llvm based
michael@0: dnl compilers right now.
michael@0: AC_DEFUN([MOZ_DOING_LTO],
michael@0: [
michael@0:   cat > conftest.c <<EOF
michael@0:                   int foo = 1;
michael@0: EOF
michael@0:   $1=no
michael@0:   if ${CC-cc} ${CFLAGS} -S conftest.c -o conftest.s >/dev/null 2>&1; then
michael@0:     if grep '^target triple =' conftest.s; then
michael@0:       $1=yes
michael@0:     fi
michael@0:   fi
michael@0:   rm -f conftest.[cs]
michael@0: ])