https://bugs.gentoo.org/881841
https://github.com/garrigue/labltk/pull/17

From e1e850972c4190686a040574b91d61948cc559b5 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Sat, 19 Nov 2022 01:14:25 +0000
Subject: [PATCH] config: Fix -Wimplicit-int, -Wstrict-prototypes (Clang 16)

Followup to be8c977d320ed40cacb322658d4ceba5e583b3a6.

Clang 16 makes -Wimplicit-int error by default.

Unfortunately, this can lead to misconfiguration or miscompilation of software as configure
tests may then return the wrong result.

We also fix -Wstrict-prototypes while here as it's easy to do and it prepares
us for C23.

For more information, see LWN.net [0] or LLVM's Discourse [1], the Gentoo wiki [2],
or the (new) c-std-porting mailing list [3].

[0] https://lwn.net/Articles/913505/
[1] https://discourse.llvm.org/t/configure-script-breakage-with-the-new-werror-implicit-function-declaration/65213
[2] https://wiki.gentoo.org/wiki/Modern_C_porting
[3] hosted at lists.linux.dev.

Signed-off-by: Sam James <sam@gentoo.org>
--- a/config/auto-aux/hasgot
+++ b/config/auto-aux/hasgot
@@ -31,7 +31,7 @@ while : ; do
 done
 
 (for f in $*; do echo "int $f();"; done
- echo "int main() {"
+ echo "int main(void) {"
  for f in $*; do echo "  $f();"; done
  echo "}") >> hasgot.c
 
--- a/config/auto-aux/tclversion.c
+++ b/config/auto-aux/tclversion.c
@@ -18,7 +18,7 @@
 #include <tcl.h>
 #include <tk.h>
 
-main ()
+int main (void)
 {
     puts(TCL_VERSION);
 }