From: Zack Weinberg <zackw@panix.com>
Date: Thu, 5 Nov 2020 14:17:05 +0000 (-0500)
Subject: AC_FUNC_STRERROR_R: Include string.h in test program.
X-Git-Tag: v2.69e~29
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c8b3f6987a7bbfe15ce2c2f04f308a6abc263d04;p=thirdparty%2Fautoconf.git

AC_FUNC_STRERROR_R: Include string.h in test program.

I misremembered how AC_LANG_PROGRAM works.  We don’t need to invoke
AC_INCLUDES_DEFAULT here but we *do* need to explicitly include
string.h.

Unfortunately we have no good way of testing for this regression with
the testsuite as it is today.

* lib/autoconf/functions.m4 (AC_FUNC_STRERROR_R): Include string.h in
  test program.
---

diff --git a/lib/autoconf/functions.m4 b/lib/autoconf/functions.m4
index e474984f..a91eeebc 100644
--- a/lib/autoconf/functions.m4
+++ b/lib/autoconf/functions.m4
@@ -1699,7 +1699,7 @@ AC_CACHE_CHECK([whether strerror_r returns char *],
 	       [ac_cv_func_strerror_r_char_p], [
     ac_cv_func_strerror_r_char_p=no
     if test $ac_cv_have_decl_strerror_r = yes; then
-      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
+      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([@%:@include <string.h>],
 	[[
 	  char buf[100];
 	  char x = *strerror_r (0, buf, sizeof buf);