[committed] [PR89221] Continue to default to '--disable-frame-pointer' for x86 GNU systems (was: [PATCH v2, i386]: Fix PR89221, --enable-frame-pointer does not work as intended)

Thomas Schwinge <[email protected]> Thu, 9 May 2019 11:55:25 +0200

Newsgroups	gmane.comp.gcc.patches,gmane.os.hurd.bugs,gmane.linux.debian.ports.bsd
Message-ID	<[email protected]>

Hi!

On Sun, 10 Feb 2019 20:51:39 +0100, Uros Bizjak <[email protected]> wrote:
> On Fri, Feb 8, 2019 at 1:24 PM Uros Bizjak <[email protected]> wrote:
> > Attached patch fixes --enable-frame-pointer handling [...]

ACK.

> Please note that this fix will re-enable frame pointer for all targets
> but linux* or darwin[[8912]]. However, since builds for e.g. cygwin
> and mingw survived just well without frame pointers in the mean time,
> we should probably list these targets as targets without frame
> pointers by default.

I agree, this would cause the least surprise, to simply keep the previous
default of '--disable-frame-pointer'.  Until such a global change is
agreed on, and made...

> Maintainers should decide.

The GNU/Hurd maintainer has decided (and also made a decision for
GNU/k*BSD); committed the attached to trunk in r271028.

Grüße
 Thomas

0001-PR89221-Continue-to-default-to-disable-frame-p.trunk.patch (text/x-diff, 2.5 KB)

From 679a49952fe543043047267cc8500c5cc1065b7b Mon Sep 17 00:00:00 2001
From: tschwinge <tschwinge@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Thu, 9 May 2019 09:51:59 +0000
Subject: [PATCH] [PR89221] Continue to default to '--disable-frame-pointer'
 for x86 GNU systems

The recent trunk r270914 for PR89221 "--enable-frame-pointer does not work as
intended" fixed a scripting defect in the x86 '--enable-frame-pointer'
handling.

This has the side effect that, for example, for '--target=i686-gnu' this is now
enabled by default: 'USE_IX86_FRAME_POINTER=1' is added to 'tm_defines'.  Given
that it's highly unlikely that anyone would now suddenly want
'--enable-frame-pointer' as the default for any kind of GNU system, I'm
changing the default back for GNU systems, to match that of a 'target_os' of
'linux* | darwin[8912]*'.

	gcc/
	PR target/89221
	* configure.ac (--enable-frame-pointer): Disable by default for
	GNU systems.
	* configure: Regenerate.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@271028 138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/ChangeLog    | 7 +++++++
 gcc/configure    | 4 ++--
 gcc/configure.ac | 4 ++--
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 37447f854c0..ea96146b5b8 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2019-05-09  Thomas Schwinge  <[email protected]>
+
+	PR target/89221
+	* configure.ac (--enable-frame-pointer): Disable by default for
+	GNU systems.
+	* configure: Regenerate.
+
 2019-05-09  Alan Modra  <[email protected]>
 
 	PR target/89271
diff --git a/gcc/configure b/gcc/configure
index 08cce6f1980..947d263a617 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -12197,8 +12197,8 @@ if test "${enable_frame_pointer+set}" = set; then :
 else
 
 case $target_os in
-linux* | darwin[8912]*)
-  # Enable -fomit-frame-pointer by default for Linux and Darwin with DWARF2.
+linux* | gnu* | darwin[8912]*)
+  # Enable -fomit-frame-pointer by default for these systems with DWARF2.
   enable_frame_pointer=no
   ;;
 *)
diff --git a/gcc/configure.ac b/gcc/configure.ac
index 7c526b9ada4..bfcdf526e44 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -1884,8 +1884,8 @@ AC_ARG_ENABLE(frame-pointer,
 		[enable -fno-omit-frame-pointer by default for x86])], [],
 [
 case $target_os in
-linux* | darwin[[8912]]*)
-  # Enable -fomit-frame-pointer by default for Linux and Darwin with DWARF2.
+linux* | gnu* | darwin[[8912]]*)
+  # Enable -fomit-frame-pointer by default for these systems with DWARF2.
   enable_frame_pointer=no
   ;;
 *)
-- 
2.17.1

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