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Re: Conditional change of C++ compiler flags

From: Ralf Wildenhues
Subject: Re: Conditional change of C++ compiler flags
Date: Wed, 26 May 2010 07:34:50 +0200
User-agent: Mutt/1.5.20 (2009-10-28)

Hello Alex,

* Alex Farber wrote on Wed, May 26, 2010 at 07:24:14AM CEST:
> I want to add --enable-debug switch to my configure script, which replaces
> default "-g O3" compiler options with "-g3 -O0". My attempt is obviously
> incorrect:
> AC_ARG_ENABLE( debug,
>     [  --enable-debug,  Enable debug build],
>     [ CXXFLAGS="${CXXFLAGS} -g3 -O0"] )
> This gives compiler command line: "-g O3 g3 -O0" instead of desired "-g3
> -O0"
> Also, automake manual doesn't recommend to touch CXXFLAGS variable, leaving
> it completely to user. What is correct way to do this?

We should have a FAQ entry for this, it comes up every other month.
Any takers?  Last instance was this (although the FAQ entry should
probably be a bit more verbose):

Hope that helps.


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