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

[Peter Rosin]

On 2012-10-02 16:02, Adrian Bunk wrote:
> On Mon, Oct 01, 2012 at 03:40:31PM -0700, Paul Eggert wrote:
>> On 10/01/2012 03:20 PM, Adrian Bunk wrote:
>>> Not if they are set to default to C99 mode.
>>
>> Ah.  True.  That may be a problem for future
>> versions of these two compilers, though it's
>> not a problem for current versions.
> 
> The same would be true for adding a __STDC_VERSION__ check to the 
> current C11 test, since all compilers that currently pass the C11
> test (only gcc 4.7) define it to the correct value...

If Autoconf checks __STDC_VERSION__, I fear that future compilers
will simply lie if they have some of the desired features, just to
get past the check. Checking it will put pressure on the compiler
vendors to set it, even when they aren't compliant (and know it).
I predict that checking it will dilute the usefulness of
__STDC_VERSION__.

Cheers,
Peter