eliminating CFLAGS

Andy Dougherty doughera at lafayette.edu
Wed Feb 10 14:47:58 UTC 2010

On Wed, 10 Feb 2010, Will Coleda wrote:

> On Tue, Feb 9, 2010 at 7:15 PM, Andy Dougherty <doughera at lafayette.edu> wrote:

> > For example, there's no easy way to say something like
> >
> >    For compiling src/gc/system.c on amd64 on certain flavors of Linux
> >    with gcc 4.3.x, optimizations -O[012] are fine, but -O3 and higher
> >    won't work.
> >

> Whoops. We're overengineering some of this.

I don't think so.  That example is very real and almost precisely the 
current state of affairs.  There are many other examples in the perl 5 

> If we want to change a warnings flag, we just need to tack it on the
> end of the command line, the second -Wno-foo will override the default
> -Wfoo.

Yes, that works for gcc.  I don't know about other compilers, but since we 
don't really support warnings on other compilers anyway, that's good 
enough for now.

> We can use the existing makefile generation step to conditionally add
> the -Wno-foo, using the #IF and #UNLESS directives already present.

Yes, but they are too blunt a tool for the task above.  They are all we 
have, so that's what we do now, but they are still inadequate.  They don't 
fail, but they are suboptimal.  That's all I'm saying.

Your plan preserves the status quo, which is ok, but if you can think of a 
way to generalize it, I think it would be beneficial.  That's all I was 
trying to say.

    Andy Dougherty		doughera at lafayette.edu

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