From 8a80c7f9d7424a6c70c728dd588c9a47171e88fd Mon Sep 17 00:00:00 2001
From: Collin Funk <collin.funk1@gmail.com>
Date: Sun, 28 Sep 2025 15:17:17 -0700
Subject: [PATCH] manual: Fix missing declaration in strdupa example.
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Without _GNU_SOURCE defined this file fails to compile with the
following error:

    $ gcc manual/examples/strdupa.c
    manual/examples/strdupa.c: In function ‘main’:
    manual/examples/strdupa.c:27:19: error: implicit declaration of function ‘strdupa’; did you mean ‘strdup’? [-Wimplicit-function-declaration]
       27 |   char *wr_path = strdupa (path);
          |                   ^~~~~~~
          |                   strdup
    manual/examples/strdupa.c:27:19: error: initialization of ‘char *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
---
 manual/examples/strdupa.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/manual/examples/strdupa.c b/manual/examples/strdupa.c
index 7fd2293d9f..004a3b3d7c 100644
--- a/manual/examples/strdupa.c
+++ b/manual/examples/strdupa.c
@@ -15,6 +15,7 @@
    along with this program; if not, see <https://www.gnu.org/licenses/>.
 */
 
+#define _GNU_SOURCE 1
 #include <paths.h>
 #include <string.h>
 #include <stdio.h>