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https://github.com/vim/vim/pull/11496
From 360b569f86b851c37e32b7cfaec079823188ff27 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Fri, 4 Nov 2022 03:18:23 +0000
Subject: [PATCH] configure.ac: Fix -Wimplicit-int
Clang 16 makes -Wimplicit-int an error by default. Fixes errors like:
```
error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Werror,-Wimplicit-int]
```
We already use proper declarations with every other test anyway, so
let's be consistent.
Signed-off-by: Sam James <sam@gentoo.org>
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -3654,7 +3654,7 @@ dnl check if struct sigcontext is defined (used for SGI only)
AC_MSG_CHECKING(for struct sigcontext)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
#include <signal.h>
-test_sig()
+int test_sig()
{
struct sigcontext *scont;
scont = (struct sigcontext *)0;
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