From e408786075b9540f76783f5c3ce87f6d1ece13cf Mon Sep 17 00:00:00 2001
From: Guillem Jover <guillem@hadrons.org>
Date: Sun, 12 Feb 2023 23:55:09 +0100
Subject: [PATCH] build: Fix version script linker support detection

When the linker uses --no-undefined-version either specified by the user
or as the default behavior (such as with newer clang >= 16 releases), a missing symbol definition will cause a linker error if that symbol is
listed in the version script.


Bug: https://bugs.gentoo.org/894010
Upstream issue: https://gitlab.freedesktop.org/libbsd/libmd/-/issues/1
Upstream commit: https://gitlab.freedesktop.org/libbsd/libmd/-/commit/e408786075b9540f76783f5c3ce87f6d1ece13cf

---
 m4/libmd-linker.m4 | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/m4/libmd-linker.m4 b/m4/libmd-linker.m4
index 7d1236a..3d6edcd 100644
--- a/m4/libmd-linker.m4
+++ b/m4/libmd-linker.m4
@@ -8,7 +8,11 @@ AC_DEFUN([LIBMD_LINKER_VERSION_SCRIPT], [
     save_LDFLAGS=$LDFLAGS
     LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
     AC_LINK_IFELSE([
-      AC_LANG_PROGRAM([], [])
+      AC_LANG_PROGRAM([[
+extern int symbol(void);
+int symbol(void) { return 0; }
+]], [[
+]])
     ], [
       libmd_cv_version_script=yes
     ], [
-- 
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