Re: New GCC takes 19x as long to compile my program (compared to old GCC), plus void** patch suggestion

[Joel Sherrill <joel dot sherrill at oarcorp dot com>]

On 08/10/2012 10:44 AM, Elmar Krieger wrote:
> Hi Ian, hi Richard, hi Andi!
>
> Many thanks for your comments.
>
>   >>>  The slowdown is not the same with other files, so I'm essentially sure
>   >>>  that this specific source file has some 'feature' that catches GCC at
>   >>>  the wrong leg. This raises my hopes that one of the GCC experts wants
>   >>>  to take a look at it. The code is confidential,
>   >>
>   >>  You could file a bug report with just a profile output of the compiler
>   >>  (e.g. from oprofile or perf)
>   >
>   >  But please use a pristine FSF compiler.  You can also run the source
> through
>   >  some obfuscation tool.  Or get a first hint with using -ftime-report.
>   >
>   >  In the end, without a testcase there is nothing to do for us ...
>
> I downloaded the latest official GCC 4.7.1, but unfortunately configure
> stopped with "Building GCC requires GMP 4.2+, MPFR 2.3.1+ and MPC
> 0.8.0+.", and for my CentOS Linux, only older versions of this libs are
> available as RPMs. I saw many hours of manual fiddling ahead, so I
> suggest a more efficient solution:
I think some of those are available as RPMs from the EPEL
repository.

But installing them from  source into a location that doesn't
conflict with the default OS install is straight forward and
well documented.

--
Joel Sherrill, Ph.D.             Director of Research&   Development
joel.sherrill@OARcorp.com        On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
    Support Available             (256) 722-9985