From 88d86e59701b3a747a55554baeb51369ae52bd18 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Mon, 11 Jan 2021 16:26:39 -0800
Subject: GCC: Check if AR works with --plugin and rc

AR from older binutils doesn't work with --plugin and rc:

[hjl@gnu-cfl-2 bin]$ touch foo.c
[hjl@gnu-cfl-2 bin]$ ar --plugin /usr/libexec/gcc/x86_64-redhat-linux/10/liblto_plugin.so rc libfoo.a foo.c
[hjl@gnu-cfl-2 bin]$ ./ar --plugin /usr/libexec/gcc/x86_64-redhat-linux/10/liblto_plugin.so rc libfoo.a foo.c
./ar: no operation specified
[hjl@gnu-cfl-2 bin]$ ./ar --version
GNU ar (Linux/GNU Binutils) 2.29.51.0.1.20180112
Copyright (C) 2018 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) any later version.
This program has absolutely no warranty.
[hjl@gnu-cfl-2 bin]$

Check if AR works with --plugin and rc before passing --plugin to AR and
RANLIB.

	PR ld/27173
	* configure: Regenerated.
	* libtool.m4 (_LT_CMD_OLD_ARCHIVE): Check if AR works with
	--plugin and rc before enabling --plugin.

config/

	PR ld/27173
	* gcc-plugin.m4 (GCC_PLUGIN_OPTION): Check if AR works with
	--plugin and rc before enabling --plugin.

libiberty/

	PR ld/27173
	* configure: Regenerated.

zlib/

	PR ld/27173
	* configure: Regenerated.
---
 config/gcc-plugin.m4 | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'config')

diff --git a/config/gcc-plugin.m4 b/config/gcc-plugin.m4
index 5e907ca5c..23c95be27 100644
--- a/config/gcc-plugin.m4
+++ b/config/gcc-plugin.m4
@@ -132,6 +132,18 @@ for plugin in $plugin_names; do
     break
   fi
 done
+dnl Check if ${AR} $plugin_option rc works.
+AC_CHECK_TOOL(AR, ar)
+if test "${AR}" = "" ; then
+  AC_MSG_ERROR([Required archive tool 'ar' not found on PATH.])
+fi
+touch conftest.c
+${AR} $plugin_option rc conftest.a conftest.c
+if test "$?" != 0; then
+  AC_MSG_WARN([Failed: $AR $plugin_option rc])
+  plugin_option=
+fi
+rm -f conftest.*
 if test -n "$plugin_option"; then
   $1="$plugin_option"
   AC_MSG_RESULT($plugin_option)
-- 
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