[PATCH 7/7] Merge of gcc patches

[Dominik Vogt <vogt at linux dot vnet dot ibm dot com>]

Patch 7.

Ciao

Dominik ^_^  ^_^

-- 

Dominik Vogt
IBM Germany

Attachment: 0007-ChangeLog
Description: Text document

>From dd32f429246bdfb929d5bebd1aa268d5eecd8de4 Mon Sep 17 00:00:00 2001
From: ian <ian@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 15 Oct 2014 15:32:41 +0000
Subject: [PATCH 7/7] configure.ac: If the compiler supports
 -Qunused-arguments,

use it when running the compiler on .s files.
---
 configure.ac | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/configure.ac b/configure.ac
index afad32c..b662f39 100644
--- a/configure.ac
+++ b/configure.ac
@@ -367,6 +367,15 @@ AC_C_BIGENDIAN
 
 GCC_AS_CFI_PSEUDO_OP
 
+AC_CACHE_CHECK([if compiler supports -Qunused-arguments],
+[libffi_cv_c_unused_arguments],
+[CFLAGS_hold=$CFLAGS
+CFLAGS="$CFLAGS -Qunused-arguments"
+AC_COMPILE_IFELSE([[int i;]],
+[libffi_cv_c_unused_arguments=yes],
+[libffi_cv_c_unused_arguments=no])
+CFLAGS=$CFLAGS_hold])
+
 if test x$TARGET = xSPARC; then
     AC_CACHE_CHECK([assembler and linker support unaligned pc related relocs],
 	libffi_cv_as_sparc_ua_pcrel, [
@@ -403,9 +412,14 @@ if test x$TARGET = xX86 || test x$TARGET = xX86_WIN32 || test x$TARGET = xX86_64
 	libffi_cv_as_x86_pcrel, [
 	libffi_cv_as_x86_pcrel=no
 	echo '.text; foo: nop; .data; .long foo-.; .text' > conftest.s
+	CFLAGS_hold=$CFLAGS
+	if test "$libffi_cv_c_unused_arguments" = yes; then
+	    CFLAGS="$CFLAGS -Qunused-arguments"
+	fi
 	if $CC $CFLAGS -c conftest.s > /dev/null 2>&1; then
 	    libffi_cv_as_x86_pcrel=yes
 	fi
+	CFLAGS=$CFLAGS_hold
 	])
     if test "x$libffi_cv_as_x86_pcrel" = xyes; then
 	AC_DEFINE(HAVE_AS_X86_PCREL, 1,
@@ -489,10 +503,15 @@ EOF
 	libffi_cv_as_x86_64_unwind_section_type=no
 	# we ensure that we can compile _and_ link an assembly file containing an @unwind section
 	# since the compiler can support it and not the linker (ie old binutils)
+	CFLAGS_hold=$CFLAGS
+	if test "$libffi_cv_c_unused_arguments" = yes; then
+	    CFLAGS="$CFLAGS -Qunused-arguments"
+	fi
 	if $CC -Wa,--fatal-warnings $CFLAGS -c conftest1.s > /dev/null 2>&1 && \
            $CC conftest2.c conftest1.o > /dev/null 2>&1 ; then
 	    libffi_cv_as_x86_64_unwind_section_type=yes
 	fi
+	CFLAGS=$CFLAGS_hold
 	])
     if test "x$libffi_cv_as_x86_64_unwind_section_type" = xyes; then
 	AC_DEFINE(HAVE_AS_X86_64_UNWIND_SECTION_TYPE, 1,
-- 
1.8.4.2