On Mon, Jun 16, 2008 at 3:35 PM, John Peterson <[EMAIL PROTECTED]> wrote:
> On Mon, Jun 16, 2008 at 3:35 PM, John Peterson <[EMAIL PROTECTED]> wrote:
>> On Mon, Jun 16, 2008 at 1:50 PM, Roy Stogner <[EMAIL PROTECTED]> wrote:
>>>
>>> Vikram just ran into this ugly problem while trying to get Ben's code
>>> up to speed with SVN libMesh. Here's a minimal test case:
>>>
>>>
>>> test.C:
>>>
>>> extern "C" {
>>> #include "petscoptions.h"
>>> }
>>> #include <tr1/unordered_map>
>>>
>>>
>>>
>>> That's it. Trying to compile this breaks in the CFDLab in all sorts
>>> of fun ways. We can work around it for now by turning off
>>> TR1_UNORDERED_MAP support (which IIRC was giving Andrea some problems
>>> over in ICES too), but I'm curious if anyone else can replicate this.
>>> Is it a quirk of our particular (somewhat out of date) PETSc and gcc
>>> versions, or is there some conflict between the PETSc namespace and
>>> the new C++ hash map standard?
>>
>> I think the problem is with Petsc. If you include "petsc.h" before
>> petscoptions.h I think it will go away?
>
> Crap, nevermind. If you include tr1/unordered_map *before*
> petscoptions.h it goes away.
>
OK, there's a line in
/usr/local/petsc/petsc-2.3.1/include/petscerror.h, line 261 --
extern PetscErrorCode __gierr;
the petsc folks define __gierr and then the gcc people are apparently
trying to use this same __gierr variable somewhere (I can't see
exactly where at the moment but the error message alludes to it). I
think this is petsc's fault because you are never supposed to use
variables starting with double underscore .
By adding this option to the compile line
-DPETSC_SKIP_UNDERSCORE_CHKERR
the compiler error seems to have gone away. I'm not sure what this
does to the behavior of the library, though.
--
John
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