From d12b647069fe4e4d0ae9b197ce8fa670387d3224 Mon Sep 17 00:00:00 2001
From: Christophe CURIS <christophe.curis@free.fr>
Date: Mon, 5 Jan 2015 11:06:30 +0100
Subject: [PATCH] updated autoconf macro gl_LD_VERSION_SCRIPT from gnulib to
 version 4

This new version now checks that version script with syntax error are
rejected, it probably led to mis-detect the option as supported when it was
actually just ignored with at most a warning; it also now implement caching
of the result to speed-up re-run of configure if user enabled it.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
---
 m4/ld-version-script.m4 | 38 +++++++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 17 deletions(-)

diff --git a/m4/ld-version-script.m4 b/m4/ld-version-script.m4
index 8fd8c899..211d67b9 100644
--- a/m4/ld-version-script.m4
+++ b/m4/ld-version-script.m4
@@ -1,5 +1,5 @@
-# ld-version-script.m4 serial 2
-dnl Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
+# ld-version-script.m4 serial 4
+dnl Copyright (C) 2008-2015 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -18,14 +18,18 @@ dnl From Simon Josefsson
 AC_DEFUN([gl_LD_VERSION_SCRIPT],
 [
   AC_ARG_ENABLE([ld-version-script],
-    AS_HELP_STRING([--enable-ld-version-script],
-      [enable linker version script (default is enabled when possible)]),
-      [have_ld_version_script=$enableval], [])
-  if test -z "$have_ld_version_script"; then
-    AC_MSG_CHECKING([if LD -Wl,--version-script works])
-    save_LDFLAGS="$LDFLAGS"
-    LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
-    cat > conftest.map <<EOF
+    [AS_HELP_STRING([--enable-ld-version-script],
+       [enable linker version script (default is enabled when possible)])],
+    [have_ld_version_script=$enableval],
+    [AC_CACHE_CHECK([if LD -Wl,--version-script works],
+       [gl_cv_sys_ld_version_script],
+       [gl_cv_sys_ld_version_script=no
+        save_LDFLAGS=$LDFLAGS
+        LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
+        echo foo >conftest.map
+        AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
+          [],
+          [cat > conftest.map <<EOF
 VERS_1 {
         global: sym;
 };
@@ -34,11 +38,11 @@ VERS_2 {
         global: sym;
 } VERS_1;
 EOF
-    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
-                   [have_ld_version_script=yes], [have_ld_version_script=no])
-    rm -f conftest.map
-    LDFLAGS="$save_LDFLAGS"
-    AC_MSG_RESULT($have_ld_version_script)
-  fi
-  AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")
+           AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
+             [gl_cv_sys_ld_version_script=yes])])
+        rm -f conftest.map
+        LDFLAGS=$save_LDFLAGS])
+     have_ld_version_script=$gl_cv_sys_ld_version_script])
+  AM_CONDITIONAL([HAVE_LD_VERSION_SCRIPT],
+    [test "$have_ld_version_script" = yes])
 ])