Re: [RFC] Reliable compiler specification setting (at least include/lib dirs) through the process environment - Will Dietz via cfe-dev

From: Will Dietz via cfe-dev <cfe-dev-NBbBogny7ofFcdTEL8lfRQ@public.gmane.org>
To: "Nathan Froyd" <nfroyd-4eJtQOnFJqFBDgjK7y7TUQ@public.gmane.org>,
	"Ludovic Courtès" <ludo-mXXj517/zsQ@public.gmane.org>
Cc: Guix-devel <guix-devel-mXXj517/zsQ@public.gmane.org>,
	gcc-/MQLu3FmUzdAfugRpC6u6w@public.gmane.org,
	nix-dev-rGrgPyRx506NN8uzcEdRPYRWq/SkRNHw@public.gmane.org,
	cfe-dev-NBbBogny7ofFcdTEL8lfRQ@public.gmane.org
Subject: Re: [RFC] Reliable compiler specification setting (at least include/lib dirs) through the process environment
Date: Thu, 27 Oct 2016 17:11:59 +0000	[thread overview]
Message-ID: <CAKGWAO-s3M77U3J8RNL8JwFuuhQd0R7ud1r4-v-mwV+wnwzcew@mail.gmail.com> (raw)
In-Reply-To: <CAGepuV+VpTJfu=RUtEioxx47QgKDCvkeN40wisGt9aceXj1mDg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

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Yes! I'm very interested in this as well!

One piece of information to add: it might be worth investigating something
more general like the configuration files used by ELLCC in controlling
their cross-compilers.

This was somewhat recently discussed here:

http://lists.llvm.org/pipermail/llvm-dev/2015-July/087907.html

And looks like the most recent description of it is here:

http://ellcc.org/blog/?p=13246

This would be rather useful in Nix for creating cross-compilers as well.

AFAIK this isn't immediately suited to your needs but I think that it's the
right direction to go
and it'd be ideal to support both use-cases if we are talking about
upstream support.

~Will

On Tue, Oct 18, 2016 at 8:46 AM Nathan Froyd via cfe-dev <
cfe-dev-NBbBogny7ofFcdTEL8lfRQ@public.gmane.org> wrote:

> On Tue, Oct 18, 2016 at 8:59 AM, Ludovic Courtès via cfe-dev
> <cfe-dev-NBbBogny7ofFcdTEL8lfRQ@public.gmane.org> wrote:
> > Shea Levy <shea-yfkUTty7RcRWk0Htik3J/w@public.gmane.org> skribis:
> >
> >> Your patches look good! My biggest concern is how the ld wrapper behaves
> >> in the presence of response files. Have you tested that?
> >
> > It surely doesn’t (yet?).
> >
> > However, GCC does not pass “@file” arguments when it invokes ‘ld’, and
> > the bug report you mentioned¹ talks about GHC invoking ‘gcc’, not ‘ld’,
> > so I guess it’s fine to ignore response files in the ld wrapper.
>
> GCC will pass response files to ld when response files were used in
> the invocation of GCC.
>
> -Nathan
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