From 23ae79fe84a3fa5d995b8c6b9be70587e37a6cd8 Mon Sep 17 00:00:00 2001
From: Reini Urban <rurban@cpan.org>
Date: Mon, 26 Mar 2018 18:31:30 +0200
Subject: [PATCH] add pic_flag to RETPOLINE cflags and ldflags

This fixes the linke probe, and fixes #55.
Also: libtool is stripping pic_flags from the shared link cmd.

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Retrieved from:
https://github.com/rurban/safeclib/commit/23ae79fe84a3fa5d995b8c6b9be70587e37a6cd8]
---
 configure.ac                    | 2 +-
 m4/ax_compiler_flags_cflags.m4  | 4 ++--
 m4/ax_compiler_flags_ldflags.m4 | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/configure.ac b/configure.ac
index 33ed7326..10325dc6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4,7 +4,7 @@
 # 2017  Reini Urban <rurban@cpan.org>
 #
 # Copyright (c) 2012, 2013 Cisco Systems
-# Copyright (c) 2017 Reini Urban
+# Copyright (c) 2017, 2018 Reini Urban
 # All rights reserved.
 #
 # Permission is hereby granted, free of charge, to any person
diff --git a/m4/ax_compiler_flags_cflags.m4 b/m4/ax_compiler_flags_cflags.m4
index 31e3ba8c..1dec00b2 100644
--- a/m4/ax_compiler_flags_cflags.m4
+++ b/m4/ax_compiler_flags_cflags.m4
@@ -66,12 +66,12 @@ AC_DEFUN([AX_COMPILER_FLAGS_CFLAGS],[
     ])
 
     # retpoline: clang-7. Note: requires lld-7 linker support
-    AX_APPEND_COMPILE_FLAGS(["-mretpoline -DRETPOLINE"],
+    AX_APPEND_COMPILE_FLAGS(["-mretpoline -DRETPOLINE $lt_prog_compiler_pic"],
         [RETPOLINE_CFLAGS],[$ax_compiler_flags_test])
     # or the equivalent gcc-7.3 variant
     if test -z "$RETPOLINE_CFLAGS"; then
         AX_APPEND_COMPILE_FLAGS(
-          ["-mindirect-branch=thunk-extern -mfunction-return=thunk-extern -mindirect-branch-register -DRETPOLINE"],
+          ["-mindirect-branch=thunk-extern -mfunction-return=thunk-extern -mindirect-branch-register $lt_prog_compiler_pic -DRETPOLINE"],
           [RETPOLINE_CFLAGS],[$ax_compiler_flags_test])
     fi
 
diff --git a/m4/ax_compiler_flags_ldflags.m4 b/m4/ax_compiler_flags_ldflags.m4
index d0287852..193f412e 100644
--- a/m4/ax_compiler_flags_ldflags.m4
+++ b/m4/ax_compiler_flags_ldflags.m4
@@ -66,7 +66,7 @@ AC_DEFUN([AX_COMPILER_FLAGS_LDFLAGS],[
     dnl /usr/bin/ld: warning: -z retpolineplt ignored.
     case $RETPOLINE_CFLAGS in
         *-mretpoline*|*-mindirect-branch=thunk-extern*)
-            AX_APPEND_LINK_FLAGS([-Wl,-z,retpolineplt],
+            AX_APPEND_LINK_FLAGS(["$RETPOLINE_CFLAGS -Wl,-z,retpolineplt"],
                 [RETPOLINE_LDFLAGS],[$ax_compiler_flags_test])
             if test -n "$RETPOLINE_LDFLAGS"; then
                 AM_CFLAGS="$AM_CFLAGS $RETPOLINE_CFLAGS"