Add used attribute in order to make NEON detection working with -flto.

diff --git a/configure.ac b/configure.ac
index 717581f..2fa7ef0 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -225,7 +225,7 @@ AC_MSG_CHECKING(for ARM NEON support in current arch/CFLAGS)
 AC_LINK_IFELSE([
 AC_LANG_PROGRAM([[
   #include <arm_neon.h>
-  int32x4_t testfunc(int16_t *a, int16_t *b) {
+  int32x4_t __attribute__((used)) testfunc(int16_t *a, int16_t *b) {
       asm volatile ("vmull.s16 q0, d0, d0" : : : "q0");
       return vmull_s16(vld1_s16(a), vld1_s16(b));
   }