FYI: Fix for gcc PR36312 breaks glibc builds over usage of /dev/null as input and output file.

[Carlos O'Donell]

On 11/19/2014 01:35 PM, Markus Trippelsdorf wrote:
> On 2014.11.19 at 09:44 -0500, Carlos O'Donell wrote:
>> The fix for gcc PR36312 breaks glibc builds.
>>
>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36312
>>
>> The fix disallows this common configure idiom:
>>
>> configure:72: checking for AVX support
>> configure:78: /home/triegel/local/gcc/bin/gcc -mavx -xc /dev/null -S -o /dev/null
>> gcc: fatal error: input file '/dev/null' is the same as output file
>> compilation terminated.
>> configure:81: $? = 1
>> configure:89: result: no
>>
>> PR is reopened with a request to fix.
>>
>> Alternatively we could discuss changing glibc, but I think
>> this will impact more than just glibc.
> 
> No need to change anything. The bug is already fixed:
> https://gcc.gnu.org/viewcvs?rev=217789&root=gcc&view=rev

Indeed! Thanks Jakub and Manuel for the quick fix. 
The kernel builds hit this before we did, so the
fix was in progress.

Cheers,
Carlos.