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bug#6538: Removal of C_DEBUG_SWITCH changes CFLAGS

From: Glenn Morris
Subject: bug#6538: Removal of C_DEBUG_SWITCH changes CFLAGS
Date: Tue, 29 Jun 2010 23:00:09 -0400
User-agent: Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/) 
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

CFLAGS=

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).


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