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Re: Don't override all other CFLAGS_FOR_TARGET when optimizing libraries for space

From: Jeff Law <law at redhat dot com>
To: Bob Dunlop <bob dot dunlop at xyzzy dot org dot uk>, gcc-patches at gcc dot gnu dot org
Date: Tue, 18 Nov 2014 15:13:00 -0700
Subject: Re: Don't override all other CFLAGS_FOR_TARGET when optimizing libraries for space
Authentication-results: sourceware.org; auth=none
References: <20141117101649 dot GA20303 at xyzzy dot org dot uk>

On 11/17/14 03:16, Bob Dunlop wrote:

Hi,

This patch prevents optimizing libraries for space from overriding all
previous CFLAGS_FOR_TARGET settings.  Add optimization flags to any
pre-existing values.

I hit this problem whilst building a Gcc cross compiler and newlib
library for ARM with crosstool-NG-1.20.0.  The newlib developers
suggested I should try posting it here.


--- gcc-4.9.2/config/mt-ospace	1999-09-04 16:09:22.000000000 +0100
+++ gcc-new/config/mt-ospace	2014-11-17 09:50:08.000000000 +0000
@@ -1,3 +1,3 @@
  # Build libraries optimizing for space, not speed.
- CFLAGS_FOR_TARGET = -g -Os
- CXXFLAGS_FOR_TARGET = -g -Os
+ CFLAGS_FOR_TARGET += -g -Os
+ CXXFLAGS_FOR_TARGET += -g -Os

Thanks.  Installed.

jeff

References:
- Don't override all other CFLAGS_FOR_TARGET when optimizing libraries for space
  - From: Bob Dunlop

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