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bug#6538: Removal of C_DEBUG_SWITCH changes CFLAGS

From: Dan Nicolaescu
Subject: bug#6538: Removal of C_DEBUG_SWITCH changes CFLAGS
Date: Wed, 30 Jun 2010 01:56:47 -0400
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux)

Glenn Morris <address@hidden> writes:

> Package: emacs
> Configuring Emacs 23.2 on Solaris 2.10 with a non-GNU cc, one gets
> generated Makefiles containing:
> CFLAGS=-g -O 
> Configuring the current trunk, one gets
> The cause appears to be the removal of C_DEBUG_SWITCH.

> It is possible other platforms are affected, I did not check (likewise
> with LIBS_DEBUG).

LIBS_DEBUG was just -lg, it can be safely ignored.

> The configure logic (faithfully inherited from cpp) is weird. Eg
> C_OPTIMIZE_SWITCH goes unused with non-GNU compilers.

Not anymore.  
C_DEBUG_SWITCH was weird, it used to specify optimization flags too,
that's probably why C_OPTIMIZE_SWITCH is unused.
C_DEBUG_SWITCH was just -g -O for all platforms that bothered to set it.  
We get that anyway for non-GCC compilers.

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