diff options
Diffstat (limited to 'build/autoconf/lto.m4')
| -rw-r--r-- | build/autoconf/lto.m4 | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/build/autoconf/lto.m4 b/build/autoconf/lto.m4 new file mode 100644 index 000000000..572a04b48 --- /dev/null +++ b/build/autoconf/lto.m4 @@ -0,0 +1,19 @@ +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/. + +dnl check if the build is using lto. This is really primitive and only detects llvm based +dnl compilers right now. +AC_DEFUN([MOZ_DOING_LTO], +[ + cat > conftest.c <<EOF + int foo = 1; +EOF + $1=no + if ${CC-cc} ${CFLAGS} -S conftest.c -o conftest.s >/dev/null 2>&1; then + if grep '^target triple =' conftest.s; then + $1=yes + fi + fi + rm -f conftest.[cs] +]) |