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List:       mingw-users
Subject:    Re: [Mingw-users] GCC 4.4.0 failed to compile GSL 1.12
From:       "Aaron W. LaFramboise" <aaron77thyme () aaronwl ! com>
Date:       2009-06-25 1:33:55
Message-ID: 4A42D403.8050705 () aaronwl ! com
[Download RAW message or body]

Massimo Gaspari wrote:
> Roumen Petrov wrote:
>> Massimo Gaspari wrote:
>>   
>>> Aaron W. LaFramboise wrote
>>>     
>>>>> Can you try adding -ffloat-store to the CFLAGS and rebuilding from 
>>>>> scratch to see if this helps?  This often solves rounding issues such as 
>>>>> these.
>>>>>
>>>>>     
>>>>>         
>>> I know.
>>> With -ffloat-store the issue disappear. Moreover the well known bug in 
>>> vegas (montecarlo) is still present, it can be avoided with -ffloat-store
>>>
>>> Max
>>>     
>> May be issue is related to precision supported by x86 FPU (long double 
>> vs double) and cache of results in registers. Explicit conversion (cast) 
>> to double in code may resolve issue for any compiler.
>>
>> I'm not sure that this is a GCC bug.
>>
>> Roumen
>>   
> 
> May be you are right. But GSL is developed using GCC/Linux  x86 and the 
> bugs are not present there ( at least using Gcc 4.2.x).

If it's true that this bug is specific to MinGW, then its probably 
something we have a shot at fixing (as opposed to PR323 issues in 
general, which will remain short of a very concerted and lengthy effort 
by a well-motivated expert).  One goal for MinGW GCC is to be at least 
as good as Linux GCC.

Massimo, can you file a detailed description of this bug on our bug 
tracker so this issue doesn't get lost?


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