Bug#503202: libc6-dev: math_errhandling isn't defined anywhere

[Aurelien Jarno <aurelien@aurel32.net>]

Aurelien Jarno a écrit :
> reassign 503202 gcc-4.3
> thanks
> 
> Matthew Vernon a écrit :
>> Package: libc6-dev
>> Version: 2.3.6.ds1-13etch7
>> Severity: important
>>
>> Hi,
>>
>> math.h has the following in it:
>> /* Bitmasks for the math_errhandling macro.  */
>> # define MATH_ERRNO     1       /* errno set by math functions.  */
>> # define MATH_ERREXCEPT 2       /* Exceptions raised by math functions.  
>> */
>>
>> but no-where is math_errhandling actually defined! This breaks code 
>> wanting to check how domain errors in floating-point code are handled 
>> (amongst other things). Section 7.12.9 of C99 discusses MATH_ERRNO, 
>> MATH_ERREXCEPT, and math_errhandling.
>>
>> SuSv3 also requires math_errhandling to be present:
>> http://www.opengroup.org/onlinepubs/009695399/basedefs/math.h.html
> 
> This is actually a compiler problem. See the footnotes on
> http://gcc.gnu.org/c99status.html . Reassigning the bug accordingly.

No, see the explanations from the thread. The behaviour of the macro has
to be different if for example -ffast-math is used, but also because
some math functions are provided by gcc.

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