But aren't there basic ways to work around this? Why don't they prefix all
struct declarations with something like proj_ or libproj_? They could then
include #defines that provide like-named symbols without the prefix UNLESS
you have #defined some sensibly named symbol, like
PROJ_NO_NAMESPACE_POLUTION. This keeps the behavior backward compatible,
but solves your problem. They don't even need to do it for all tokens, just
the ones that give trouble, at least for starters.
Hrmph.
David
On Thu, May 21, 2015 at 6:19 AM, <sisyph...@optusnet.com.au> wrote:
>
> From: Chris Marshall
> Sent: Thursday, May 21, 2015 3:24 AM
> To: Sisyphus
> Cc: pdl-devel@lists.sourceforge.net
> Subject: Re: [Pdl-devel] Insert C code before '#include "EXTERN.h"'
>
> > It's a hack but what about adding -D_PROVIDER_STRUCTS_DEFINED to the
> > DEFINE?
>
> Yes, that does the trick - and allows me to verify that it doesn't have the
> effect I hoped it would have.
>
> There's a problem with PDL::GIS::Proj that arises because the proj header
> projects.h introduces a symbol named PVALUE. Unfortunately a symbol of the
> same name has already been introduced in winreg.h.
>
> I've been working around this problem by hacking the proj code prior to
> building the library, so that "PVALUE" is replaced by a symbol that doesn't
> clash.
> It's a pita, and I'm looking for a better solution - but defining
> _PROVIDER_STRUCTS_DEFINED is not it.
>
> Best solution would be if the proj developers renamed "PVALUE" to something
> that doesn't clash - but they're not entirely thrilled at that prospect,
> given that projects.h is public (to some extent, at least).
>
> Cheers,
> Rob
>
>
>
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