gecko/build/autoconf/lto.m4

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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]
])