buildbot failure in MacPorts on buildports-snowleopard-x86_64

[Joshua Root]

It's possible (if hopefully unlikely) there are subtle semantic
differences that they rely on. Safest would be to use -std=gnu89
instead, which gcc-4.2 does accept, and in later gcc versions specifies
the same behaviour as gnu90. (The reason for the synonym is that ISO C90
is identical to ANSI C89.)

The flag of course only changes anything when using clang, as it
defaults to c99 but (llvm-)gcc-4.2 already uses gnu89 by default.

On 2013-6-7 12:18 , Michael Dickens wrote:
> I can replicate the error by selecting "configure.compiler=llvm-gcc-4.2"
> on my 10.8 box. After some testing, I see no reason why they use
> "-std=gnu90" at all -- it does not seem to impact compilation, at least
> on OSX.  Maybe it works on some other host OS.  So, I'm just removing
> the use of it. - MLD
> 
> On Thu, Jun 6, 2013, at 01:52 PM, Michael Dickens wrote:
>> Interesting; thanks! I'll look into it shortly. - MLD
>>
>> On Thu, Jun 6, 2013, at 01:50 PM, Ryan Schmidt wrote:
>>> I can reproduce this problem on 10.6.  According to build/CMakeFiles/CMakeError.log the reason why this failed is "-std=gnu90" is not recognized by gcc 4.2: