guile-lzlib fix for native build with gcc-14

[Janneke Nieuwenhuizen <janneke@gnu.org>]

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Hi Mathieu,

This is a bit of a deja-vu, I'm using the attached patch for a native
build of guile-lzlib with gcc-14 on "core-packages-team".

Greetings,
Janneke


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From 8b0db8997007d427ce9e77cb8191e698d1c47f02 Mon Sep 17 00:00:00 2001
From: "janneke@gnu.org" <janneke@gnu.org>
Date: Sat, 7 Dec 2024 09:48:49 +0100
Subject: [PATCH] build: Support gcc-14.

* configure.ac: When compiling natively declare LZ_decompress_open before
using it in conftest.c.
---
 configure.ac | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 4c56768..ffdab1d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -43,7 +43,10 @@ EOF
      else
        old_LIBS="$LIBS"
        LIBS="-llz"
-       AC_LINK_IFELSE([AC_LANG_SOURCE([int main () { return LZ_decompress_open(); }])],
+       AC_LINK_IFELSE([AC_LANG_SOURCE([
+int LZ_decompress_open ();
+int main () { return LZ_decompress_open(); }
+])],
 	 [guile_cv_liblz_libdir="`ldd conftest$EXEEXT | grep liblz | sed '-es/.*=> \(.*\) .*$/\1/g'`"])
        LIBS="$old_LIBS"
      fi])
-- 
2.46.0


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