https://github.com/libsdl-org/autoconf/commit/ce3d5ff4f2d46e77bdb30e1061bcc36c3cfe1112
From ce3d5ff4f2d46e77bdb30e1061bcc36c3cfe1112 Mon Sep 17 00:00:00 2001
From: Paul Eggert <[EMAIL REDACTED]>
Date: Thu, 31 Mar 2022 23:25:35 -0700
Subject: [PATCH] Work around memory-leak false alarms
Problem reported by Raphael Isemann in:
https://lists.gnu.org/r/autoconf-patches/2022-03/msg00007.html
* lib/autoconf/c.m4 (_AC_C_C99_TEST_MAIN, AC_C_FLEXIBLE_ARRAY_MEMBER):
* tests/data/gnulib_std_gnu11_2020_08_17.m4 (_AC_C_C99_TEST_HEADER):
Free storage allocated via malloc, to pacify overly-picky
implementations that issue false alarms about memory leaks.
---
lib/autoconf/c.m4 | 6 +++++-
tests/data/gnulib_std_gnu11_2020_08_17.m4 | 2 ++
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
index 48bd49a3..42fbcbd0 100644
--- a/lib/autoconf/c.m4
+++ b/lib/autoconf/c.m4
@@ -1330,6 +1330,8 @@ ac_c_conftest_c99_main='
ia->datasize = 10;
for (int i = 0; i < ia->datasize; ++i)
ia->data[i] = i * 1.234;
+ // Work around memory leak warnings.
+ free (ia);
// Check named initializers.
struct named_init ni = {
@@ -2170,7 +2172,9 @@ AC_DEFUN([AC_C_FLEXIBLE_ARRAY_MEMBER],
struct s *p = (struct s *) malloc (offsetof (struct s, d)
+ m * sizeof (double));
p->d[0] = 0.0;
- return p->d != (double *) NULL;]])],
+ m = p->d != (double *) NULL;
+ free (p);
+ return m;]])],
[ac_cv_c_flexmember=yes],
[ac_cv_c_flexmember=no])])
if test $ac_cv_c_flexmember = yes; then
diff --git a/tests/data/gnulib_std_gnu11_2020_08_17.m4 b/tests/data/gnulib_std_gnu11_2020_08_17.m4
index da52cd6f..21f7cc7a 100644
--- a/tests/data/gnulib_std_gnu11_2020_08_17.m4
+++ b/tests/data/gnulib_std_gnu11_2020_08_17.m4
@@ -319,6 +319,8 @@ AC_DEFUN([_AC_C_C99_TEST_BODY],
ia->datasize = 10;
for (int i = 0; i < ia->datasize; ++i)
ia->data[i] = i * 1.234;
+ // Work around memory leak warnings.
+ free (ia);
// Check named initializers.
struct named_init ni = {