Re: [Patch] Fix ac_c99_complex configury

[Mark Mitchell <mark at codesourcery dot com>]

Paolo Carlini wrote:
> Mark Mitchell wrote:
>
>
> > Benjamin Kosnik wrote:
> >
> >
> > > > the use of the new __builtin_clog exposed a serious weakness in our
> > > > configury: the check for ac_c99_complex (and then for
> > > > _GLIBCXX_USE_C99_COMPLEX), uses the C compiler together with
> > > > AC_TRY_COMPILE: we are basically checking for prototypes but C (vs C++)
> > > > doesn't care and this means that the test basically *always* passes. I
> > > > propose to simply use AC_TRY_LINK, here and I'm finishing regtesting
> > > > the
> > > > below.
> > >
> > > You can't use any link tests in this macro, it's used by crosses and
> > > native toolchains.
> >
> > I thought you just couldn't use run tests.  Why can't you use link tests?
>
>
> At least this is not *totally* obvious, fiuu! Thanks: often I feel a
> little stupid when I have to do with the configury bits and now I can
> fool myself that I'm not more naive than our release manager, great! ;) ;)

Heh.  Do you actually know the answer to my question, or are you 
confused like me?

--
Mark Mitchell
CodeSourcery, LLC
mark@codesourcery.com
(916) 791-8304