[PyQt] Platforms directive or tags, or both?

Larry Shaffer larrys at dakotacarto.com
Thu Oct 18 18:58:59 BST 2012

Hi Phil,

Thanks for the reply.

On Thu, Oct 18, 2012 at 10:03 AM, Phil Thompson
<phil at riverbankcomputing.com> wrote:
> On Thu, 18 Oct 2012 09:42:30 -0600, Larry Shaffer <larrys at dakotacarto.com>
> wrote:
>> Hi,
>> I'm working on a fix for Mac (for QGIS project) where size_t needs a
>> different typedef in a sip file than other platforms.
>> See: http://hub.qgis.org/issues/6505
>> The build system is CMake that passes -t WS_MACX from the found PyQt4
>> config on the command line. So, I wrote a simple:
>> %If (WS_MACX)
>> typedef unsigned long size_t;
>> %End
>> %If (!WS_MACX)
>> typedef unsigned int size_t;
>> %End
>> When I tried to enable the platform with  %Platforms {WS_MACX} I was
>> presented with an error noting it had already been defined (or
>> enabled), presumably because of the existing tag. Does the Platforms
>> directive need to be used if already enabling a platform via -t on the
>> command line?
> %Platforms defines the platform, it doesn't enable it - you just need to
> use it as you have done and pass the right -t flag.


>> Also, I would either like to know what the other platforms' (Win,
>> Linux, etc.) tags are expected to be and whether those can be counted
>> on being consistent, or whether I can just use the CMake platform
>> variables to pass in known, valid tags (WIN32, UNIX, APPLE) to use in
>> sip files.
> Platforms (and tags) are a SIP specific thing.

What I was suggesting is this:

typedef unsigned long size_t;
%If (!APPLE)
typedef unsigned int size_t;

where the generic platform tags are generated by CMake, before being
concatenated to sip command line options:

    LIST(APPEND _sip_tags -t APPLE)
    LIST(APPEND _sip_tags -t WIN32)

This would bypass the PyQt tags and use a set of
already-known-to-be-valid platform tags from CMake. This appears for
work for the Mac issue, but I'm asking if it is a proper use of the
Platforms directive and tags. ??

Lastly, if what I have done is OK, do I need to define the other
platforms (UNIX_NOTAPPLE, WIN32) in the Platforms directive if I am
only concerned with whether or not APPLE is enabled in the IF
directives, i.e. can I just do the following and have it work on
non-APPLE platforms?

%Platforms {APPLE}
typedef unsigned long size_t;
%If (!APPLE)
typedef unsigned int size_t;



>> The project has to support older sip versions on some distros, so the
>> benefits provided by sip 4.14 for Platforms can't be used.
> Phil

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