From: Bruno Haible <bruno@clisp.org>
Date: Mon, 19 Jun 2023 13:05:34 +0000 (+0200)
Subject: build: Silence most warnings from gcc 11.
X-Git-Tag: v0.23~424
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=225d113080413a7c174a3923d7d5684ba844d7b1;p=thirdparty%2Fgettext.git

build: Silence most warnings from gcc 11.

* m4/more-warnings.m4 (gt_MORE_WARNINGS): With gcc 11 or older, silence three
more types of warnings.
---

diff --git a/m4/more-warnings.m4 b/m4/more-warnings.m4
index 42c168b10..d0ebdf348 100644
--- a/m4/more-warnings.m4
+++ b/m4/more-warnings.m4
@@ -1,4 +1,4 @@
-# more-warnings.m4 serial 1 (gettext-0.21.2)
+# more-warnings.m4 serial 2 (gettext-0.23)
 dnl Copyright (C) 2023 Free Software Foundation, Inc.
 dnl This file is free software, distributed under the terms of the GNU
 dnl General Public License.  As a special exception to the GNU General
@@ -135,6 +135,18 @@ AS_HELP_STRING([[--disable-more-warnings]], [obey exactly the warning options sp
     dnl that the compiler could often infer and which have little effect on the
     dnl performance of the generated code.
     nw="$nw -Wsuggest-attribute=cold"
+    dnl With GCC 11 and older, there warnings are pointless:
+    dnl "warning: stack protector not protecting local variables: variable
+    dnl length buffer [-Wstack-protector]", "[-Wanalyzer-use-after-free],
+    dnl "[-Wanalyzer-free-of-non-heap]".
+    AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[
+      #if __GNUC__ > 11
+      #error "You are lucky"
+      #endif
+      ]])],
+      [nw="$nw -Wstack-protector"
+       nw="$nw -Wanalyzer-use-after-free -Wanalyzer-free-of-non-heap"
+      ])
 
     dnl Setup the list of meaningful warning options for the C compiler.
     dnl The list comes from manywarnings.m4. Warning options that are not