[vtk-developers] dashboard warning from VS10 math.h

[David Gobbi]

Hey, I found this in pyconfig.h:

#define hypot _hypot

So if we add "#undef hypot" to vtkPython.h the warning should go
away.  You want to give it a shot?

 - David

On Tue, Mar 26, 2013 at 8:46 AM, David Gobbi <david.gobbi at gmail.com> wrote:
> So it was already defined once as a library function, and then math.h
> is redefining it as an inline. Could have something to do with the
> complex release-versus-debug stuff in vtkPython.h.  Or it could be
> that python defines its own hypot() function somewhere.  It's too bad
> that VS10 isn't giving us the location of the previous definition,
> that would make it a lot easier to track down the issue.
>
> I'd say suppress it, the python wrappers definitely don't use the
> hypot() function anywhere, and it wouldn't matter if they used an
> inline version instead of a library-based version anyway.
>
>  - David
>
> On Tue, Mar 26, 2013 at 8:33 AM, David Cole <dlrdave at aol.com> wrote:
>> Ping on this one again.
>>
>> Anybody have any insight into whether this warning means we should change
>> some code in VTK's python layer that includes math.h? Or should I suppress
>> this warning as "hmmm, strange, not much we can do about it" ... ?
>>
>> Thanks,
>> David C.
>>
>>
>>
>> -----Original Message-----
>> From: David Cole <dlrdave at aol.com>
>> To: David Gobbi <david.gobbi at gmail.com>
>> Cc: VTK Developers <vtk-developers at vtk.org>
>> Sent: Thu, Mar 21, 2013 7:48 am
>> Subject: RE: [vtk-developers] dashboard warning from VS10 math.h
>>
>>
>>
>> math.h, including line 162, on that machine has:
>>
>>
>> 158:  /* hypot and hypotf are now part of the C99 Standard */
>> 159:  #if !defined(RC_INVOKED) && !defined(__midl)
>> 160:
>> 161:  static __inline double __CRTDECL hypot(_In_ double _X, _In_ double _Y)
>> 162:  {
>> 163:      return _hypot(_X, _Y);
>> 164:  }
>>
>>
>>
>>
>>                 From: David Gobbi
>>                 Sent: March 20, 2013 10:05 PM
>>                 To: David Cole
>>                         CC: VTK Developers
>>                 Subject: Re: [vtk-developers] dashboard warning from VS10
>> math.h
>>
>>
>>
>>
>> On Wed, Mar 20, 2013 at 7:40 PM, David Cole <dlrdave at aol.com> wrote:
>>>
>>> After turning on python and Qt, I started getting warnings like this
>>
>> on my
>>>
>>> dashboard:
>>>
>>> [3933/8363] Building CXX object
>>>
>> Wrapping\Python\CMakeFiles\vtkWrappingPython.dir\vtkPythonCommand.cxx.obj
>>
>>>
>>> C:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\math.h(162) :
>>> warning C4211: nonstandard extension used : redefined extern to stat
>>>
>>>      http://open.cdash.org/viewBuildError.php?type=1&buildid=2851369
>>>
>>> Should I suppress those in the CTestCustom file (in case somebody
>>
>> else runs
>>>
>>> a similar dashboard eventually), or should I use “/wd4211” in my
>>
>> compiler
>>>
>>> flags locally for this build, or ... something else?
>>
>>
>> The first step is to find out what is causing the warning, the
>> compiler gives the line number.  Is math.h redefining something
>> that we have already defined in VTK?  If so, we want to know.
>> The warning should only be hidden after it has been determined
>> to be either harmless or unavoidable.
>>
>>  - David
>>
>>