From: Guillem Jover <guillem@hadrons.org>
Date: Sun, 12 Feb 2023 22:55:09 +0000 (+0100)
Subject: build: Fix version script linker support detection
X-Git-Tag: 0.11.8~60
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dec783dce5a7131e232a06e63a544645b5463dd8;p=thirdparty%2Flibbsd.git

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.
---

diff --git a/configure.ac b/configure.ac
index 875ff04..4faddd0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,7 +39,11 @@ AC_CACHE_CHECK([if ld supports --version-script flag],
   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; }
+]], [[
+]])
   ], [
     libbsd_cv_version_script=yes
   ], [