diff --git a/configure b/configure
index 7476ca8859071f8f22f95518152dd7b079f6c47e..72ffaeacc586bd00f1977845475c9d7fb8190dfa 100755
--- a/configure
+++ b/configure
@@ -1146,10 +1146,16 @@ check_func_headers(){
         for hdr in $headers; do
             print_include $hdr
         done
+        echo "#include <stdint.h>"
         for func in $funcs; do
             echo "long check_$func(void) { return (long) $func; }"
         done
-        echo "int main(void) { return 0; }"
+        echo "int main(void) { int ret = 0;"
+        # LTO could optimize out the test functions without this
+        for func in $funcs; do
+            echo " ret |= ((intptr_t)check_$func) & 0xFFFF;"
+        done
+        echo "return ret; }"
     } | check_ld "cc" "$@" && enable $funcs && enable_safe $headers
 }