Re: modification of CFLAGS

[Jason Curl]

Hello Ralf,
On 20/05/2010 20:45, Ralf Wildenhues wrote:
> Hello Jason,
>
> * Jason Curl wrote on Thu, May 20, 2010 at 08:40:39PM CEST:
>    
> > However, I see that the autoconf macros already modify CFLAGS. Is
> > there a way that I can obtain what the user originally entered
> > *within* my macro after AC_PROG_CC? If the user provided CFLAGS, I
> > wish to use that and make no modifications. Otherwise, if GNU CC is
> > used, I wish to set it to "-O0 -g".
> >
> > Currently, autotools sets it to "-O2 -g". I can't seem to figure out
> > where the original settings are given.
> >      
> You can access $CFLAGS before AC_PROG_CC, for example save its value to
> some other variable:
>    LX_CFLAGS=${CFLAGS-NONE}
>    
Thought about this before I posted and it's viable. Are you sure there's 
no way to get this within my macro? This allows me to encapsulate all 
functionality in a separate file with only one line in the configure.ac.
> This will set them to "NONE" if CFLAGS was not set, and to $CFLAGS if it
> was set to some empty or nonempty value.
>
> Then, in your macro, you can access and compare $LX_CFLAGS and $CFLAGS,
> for example.  The macro should be called right (or soon) after
> AC_PROG_CC, I guess, so other compiler tests use your flags.
>
> Cheers,
> Ralf
>