package/nginx: fix compile error in configure script

Building with GCC 14 fails at the configure step with:

    ./configure: error: libatomic_ops library was not found.

The error is not caused by a missing library, but by an unrelated
"incompatible pointer type" error in the test program:

    ...
    checking for atomic_ops library
    objs/autotest.c: In function 'main':
    objs/autotest.c:9:48: error: passing argument 1 of 'AO_compare_and_swap' from incompatible pointer type [-Wincompatible-pointer-types]

This used to be a warning, but it is an error since GCC 14.[1]

Fix this by patching the test program in order to use the correct
pointer types.

Fixes: http://autobuild.buildroot.net/results/a3d/a3d8c6fd631b31e272e4d8cc6c3318f2e4151882

[1] https://gcc.gnu.org/gcc-14/porting_to.html#incompatible-pointer-types

Signed-off-by: Edgar Bonet <[email protected]>
Signed-off-by: Arnout Vandecappelle <[email protected]>

package/nginx/0011-Fix-compile-error-in-configure-script.patch

@@ -0,0 +1,33 @@
+From e1bcac837f6aeabc4ddece06ecbcf2bcca8dd651 Mon Sep 17 00:00:00 2001
+From: Edgar Bonet <[email protected]>
+Date: Thu, 16 May 2024 11:15:10 +0200
+Subject: [PATCH] Configure: fixed building libatomic test.
+
+Using "long *" instead of "AO_t *" leads either to -Wincompatible-pointer-types
+or -Wpointer-sign warnings, depending on whether long and size_t are compatible
+types (e.g., ILP32 versus LP64 data models).  Notably, -Wpointer-sign warnings
+are enabled by default in Clang only, and -Wincompatible-pointer-types is an
+error starting from GCC 14.
+
+Signed-off-by: Edgar Bonet <[email protected]>
+Upstream: https://hg.nginx.org/nginx/rev/f58b6f636238
+---
+ auto/lib/libatomic/conf | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/auto/lib/libatomic/conf b/auto/lib/libatomic/conf
+index d1e484a..0f12b9c 100644
+--- a/auto/lib/libatomic/conf
++++ b/auto/lib/libatomic/conf
+@@ -20,7 +20,7 @@ else
+                       #include <atomic_ops.h>"
+     ngx_feature_path=
+     ngx_feature_libs="-latomic_ops"
+-    ngx_feature_test="long  n = 0;
++    ngx_feature_test="AO_t  n = 0;
+                       if (!AO_compare_and_swap(&n, 0, 1))
+                           return 1;
+                       if (AO_fetch_and_add(&n, 1) != 1)
+-- 
+2.34.1
+