diff -Nrup a/configure b/configure
--- a/configure 2006-09-20 16:34:03.000000000 -0600
+++ b/configure 2019-12-19 06:07:54.302627575 -0700
@@ -11959,7 +11959,7 @@ cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
#include <malloc.h>
-int test1() {
+__attribute__ ((used)) int test1() {
return _alloca(42);
}
diff -Nrup a/configure.ac b/configure.ac
--- a/configure.ac 2006-05-03 08:10:36.000000000 -0600
+++ b/configure.ac 2019-12-19 06:07:27.468727400 -0700
@@ -451,7 +451,7 @@ dnl Visual C++ doesn't have alloca, does
AC_CACHE_CHECK(for _alloca, ac_cv_c__alloca,
[AC_TRY_LINK([
#include <malloc.h>
-int test1() {
+__attribute__ ((used)) int test1() {
return _alloca(42);
}
],