From b23ce2cee7329bbf425f18b49973b7a5f23dfcb4 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Tue, 20 Sep 2022 10:56:44 +0200
Subject: curl-compilers.m4: for gcc + want warnings, set gnu89 standard

To better verify that the code is C89

Closes #9542
---
 m4/curl-compilers.m4 | 1 +
 1 file changed, 1 insertion(+)

(limited to 'm4')

diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index dba2c755f..e39d97801 100644
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -860,6 +860,7 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
       GNU_C)
         #
         if test "$want_warnings" = "yes"; then
+          tmp_CFLAGS="$tmp_CFLAGS -std=gnu89"
           #
           dnl Do not enable -pedantic when cross-compiling with a gcc older
           dnl than 3.0, to avoid warnings from third party system headers.
-- 
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