From 5f69fdaabd40caaf81e63cdb09d175e3d660daa2 Mon Sep 17 00:00:00 2001
From: ian <ian@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon, 29 Sep 2014 23:37:27 +0000
Subject: [PATCH] libgo/configure: Use -Qunused-arguments for asm tests if
 supported.

This supports clang, which by default issues warnings about
unused command line arguments, a habit that interacts poorly
with configure scripts.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@215699 138bc75d-0d04-0410-961f-82ee72b054a4
---
 libgo/configure    | 37 +++++++++++++++++++++++++++++++++++++
 libgo/configure.ac | 24 ++++++++++++++++++++++++
 2 files changed, 61 insertions(+)

diff --git a/libgo/configure b/libgo/configure
index 08ddb1808ee..486129030f3 100755
--- a/libgo/configure
+++ b/libgo/configure
@@ -15241,6 +15241,28 @@ $as_echo "#define EH_FRAME_FLAGS \"aw\"" >>confdefs.h
 
 fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if compiler supports -Qunused-arguments" >&5
+$as_echo_n "checking if compiler supports -Qunused-arguments... " >&6; }
+if test "${libgo_cv_c_unused_arguments+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  CFLAGS_hold=$CFLAGS
+CFLAGS="$CFLAGS -Qunused-arguments"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int i;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libgo_cv_c_unused_arguments=yes
+else
+  libgo_cv_c_unused_arguments=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+CFLAGS=$CFLAGS_hold
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_c_unused_arguments" >&5
+$as_echo "$libgo_cv_c_unused_arguments" >&6; }
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking if assembler supports GNU comdat group syntax" >&5
 $as_echo_n "checking if assembler supports GNU comdat group syntax... " >&6; }
 if test "${libgo_cv_as_comdat_gnu+set}" = set; then :
@@ -15248,11 +15270,16 @@ if test "${libgo_cv_as_comdat_gnu+set}" = set; then :
 else
 
 echo '.section .text,"axG",@progbits,.foo,comdat' > conftest.s
+CFLAGS_hold=$CFLAGS
+if test "$libgo_cv_c_unused_arguments" = yes; then
+  CFLAGS="$CFLAGS -Qunused-arguments"
+fi
 if $CC $CFLAGS -c conftest.s > /dev/null 2>&1; then
   libgo_cv_as_comdat_gnu=yes
 else
   libgo_cv_as_comdat_gnu=no
 fi
+CFLAGS=$CFLAGS_hold
 
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_as_comdat_gnu" >&5
@@ -15271,9 +15298,14 @@ else
 
 libgo_cv_as_x86_pcrel=yes
 echo '.text; foo: nop; .data; .long foo-.; .text' > conftest.s
+CFLAGS_hold=$CFLAGS
+if test "$libgo_cv_c_unused_arguments" = yes; then
+  CFLAGS="$CFLAGS -Qunused-arguments"
+fi
 if $CC $CFLAGS -c conftest.s 2>&1 | $EGREP -i 'illegal|warning' > /dev/null; then
     libgo_cv_as_x86_pcrel=no
 fi
+CFLAGS=$CFLAGS_hold
 
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_as_x86_pcrel" >&5
@@ -15292,9 +15324,14 @@ else
 
 libgo_cv_as_x86_64_unwind_section_type=yes
 echo '.section .eh_frame,"a",@unwind' > conftest.s
+CFLAGS_hold=$CFLAGS
+if test "$libgo_cv_c_unused_arguments" = yes; then
+  CFLAGS="$CFLAGS -Qunused-arguments"
+fi
 if $CC $CFLAGS -c conftest.s 2>&1 | grep -i warning > /dev/null; then
     libgo_cv_as_x86_64_unwind_section_type=no
 fi
+CFLAGS=$CFLAGS_hold
 
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_as_x86_64_unwind_section_type" >&5
diff --git a/libgo/configure.ac b/libgo/configure.ac
index 5e1e4d92235..11bba70150b 100644
--- a/libgo/configure.ac
+++ b/libgo/configure.ac
@@ -785,14 +785,28 @@ else
 	    [Define to the flags needed for the .section .eh_frame directive.])
 fi
 
+AC_CACHE_CHECK([if compiler supports -Qunused-arguments],
+[libgo_cv_c_unused_arguments],
+[CFLAGS_hold=$CFLAGS
+CFLAGS="$CFLAGS -Qunused-arguments"
+AC_COMPILE_IFELSE([[int i;]],
+[libgo_cv_c_unused_arguments=yes],
+[libgo_cv_c_unused_arguments=no])
+CFLAGS=$CFLAGS_hold])
+
 AC_CACHE_CHECK([if assembler supports GNU comdat group syntax],
 libgo_cv_as_comdat_gnu, [
 echo '.section .text,"axG",@progbits,.foo,comdat' > conftest.s
+CFLAGS_hold=$CFLAGS
+if test "$libgo_cv_c_unused_arguments" = yes; then
+  CFLAGS="$CFLAGS -Qunused-arguments"
+fi
 if $CC $CFLAGS -c conftest.s > /dev/null 2>&1; then
   libgo_cv_as_comdat_gnu=yes
 else
   libgo_cv_as_comdat_gnu=no
 fi
+CFLAGS=$CFLAGS_hold
 ])
 if test "x$libgo_cv_as_comdat_gnu" = xyes; then
   AC_DEFINE(HAVE_AS_COMDAT_GAS, 1,
@@ -803,9 +817,14 @@ AC_CACHE_CHECK([assembler supports pc related relocs],
 libgo_cv_as_x86_pcrel, [
 libgo_cv_as_x86_pcrel=yes
 echo '.text; foo: nop; .data; .long foo-.; .text' > conftest.s
+CFLAGS_hold=$CFLAGS
+if test "$libgo_cv_c_unused_arguments" = yes; then
+  CFLAGS="$CFLAGS -Qunused-arguments"
+fi
 if $CC $CFLAGS -c conftest.s 2>&1 | $EGREP -i 'illegal|warning' > /dev/null; then
     libgo_cv_as_x86_pcrel=no
 fi
+CFLAGS=$CFLAGS_hold
 ])
 if test "x$libgo_cv_as_x86_pcrel" = xyes; then
   AC_DEFINE(HAVE_AS_X86_PCREL, 1,
@@ -816,9 +835,14 @@ AC_CACHE_CHECK([assembler supports unwind section type],
 libgo_cv_as_x86_64_unwind_section_type, [
 libgo_cv_as_x86_64_unwind_section_type=yes
 echo '.section .eh_frame,"a",@unwind' > conftest.s
+CFLAGS_hold=$CFLAGS
+if test "$libgo_cv_c_unused_arguments" = yes; then
+  CFLAGS="$CFLAGS -Qunused-arguments"
+fi
 if $CC $CFLAGS -c conftest.s 2>&1 | grep -i warning > /dev/null; then
     libgo_cv_as_x86_64_unwind_section_type=no
 fi
+CFLAGS=$CFLAGS_hold
 ])
 if test "x$libgo_cv_as_x86_64_unwind_section_type" = xyes; then
   AC_DEFINE(HAVE_AS_X86_64_UNWIND_SECTION_TYPE, 1,
-- 
2.11.4.GIT