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Re: bug: "gcc -std=gnu99" passes AC_PROG_CC_C11

From: Adrian Bunk
Subject: Re: bug: "gcc -std=gnu99" passes AC_PROG_CC_C11
Date: Fri, 28 Sep 2012 16:22:47 +0300
User-agent: Mutt/1.5.21 (2010-09-15)

On Fri, Sep 28, 2012 at 04:10:29PM +0300, Andrew W. Nosenko wrote:
> On Fri, Sep 28, 2012 at 3:34 PM, Adrian Bunk <address@hidden> wrote:
> > On Thu, Sep 27, 2012 at 06:12:55PM -0700, Paul Eggert wrote:
> >> On 09/27/2012 10:04 AM, Adrian Bunk wrote:
> >> > I merely wanted to point out that there can be a difference in what
> >> > glibc provides when we end up with gnu99 instead of gnu11.
> >>
> >> Yes.  And programs using Autoconf will surely prefer the gnu11
> >> version, which is why defaulting to gnu11 is a win.
> >>...
> >
> > Which brings us back to why I call it a bug that gnu99 passes the
> > current C11 test.
> Exuse me, but if compiler+language support library passes all feature
> checks, which are essencial to name this pair c11-compatible, then why
> bother?
> If c11-compatibility implies more than these checks, then why not
> extend the checks for cover these essencial features?
> But please, dont start the messing with brain-dameged defines like
> __STDC_VERSION__.  After all, Autoconf is all about the actual
> features of compilation environment, not about "branding labels" on
> that environment.

C11 compatibility implies the correct __STDC_VERSION__ value.

And as I already explained here in this thread the __STDC_VERSION__ 
value set by the compiler does matter, e.g. with glibc it enables some 
C11 functionality in the C library.



       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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