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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: Wed, 30 Jun 2010 02:37:14 -0400
User-agent: Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/)

Dan Nicolaescu wrote:

> C_DEBUG_SWITCH was weird, it used to specify optimization flags too,
> that's probably why C_OPTIMIZE_SWITCH is unused.

Yes, it was all very weird...

> C_DEBUG_SWITCH was just -g -O for all platforms that bothered to set it.  

What about irix6-5: "-g3 -O -OPT:Olimit=3500".

> We get that anyway for non-GCC compilers.

I noticed that AC_PROG_CC tests for -g, and adds it to CFLAGS if
supported. It also adds -O2 when using gcc. Perhaps this could be used
to further simplify configure.in...

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