[EXTERNAL] Unable to use 'sip-build --debug'

Phil Thompson phil at riverbankcomputing.com
Thu Mar 4 16:02:37 GMT 2021

sip-build (rather than sip-install) leaves the build directory intact.


On 04/03/2021 15:57, John Ehresman wrote:
> Is there an option to keep the generated C files that normally get 
> deleted?
> Thanks,
> John
>> On Mar 4, 2021, at 10:43 AM, Phil Thompson 
>> <phil at riverbankcomputing.com> wrote:
>> I will add support (probably SIP v6.1) that will allow you to do...
>> python -m sipbuild.tools.build
>> The purpose of the check for a debug build is to avoid a conflict with 
>> the use of the limited API. I'm pretty sure this conflict was removed 
>> in Python v3.8 (I'll try and resolve it in v6.1).
>> In the meantime you can try setting the 'py_debug' project option in 
>> pyproject.toml. This overrides SIP's test for whether it is running 
>> under a debug build of Python.
>> Phil
>> On 04/03/2021 14:17, Gehlhaar, Daniel Kurt wrote:
>>> Thank you, Phil.
>>> Is there any way to deliver these scripts as Python scripts so I can
>>> do "python sip-install.py" versus "python_d sip-install.py"?  That
>>> seems an easy solution unless I am missing something.
>>> Regards,
>>> Dan
>>> -----Original Message-----
>>> From: Phil Thompson <phil at riverbankcomputing.com>
>>> Sent: Thursday, March 4, 2021 4:19 AM
>>> To: Gehlhaar, Daniel Kurt <dan.gehlhaar at pfizer.com>
>>> Cc: 'pyqt at riverbankcomputing.com' <pyqt at riverbankcomputing.com>
>>> Subject: [EXTERNAL] Re: Unable to use 'sip-build --debug'
>>> On 03/03/2021 16:52, Gehlhaar, Daniel Kurt wrote:
>>>> All,
>>>> I am unable to use "sip-build --debug" to build debuggable bindings
>>>> for my custom project. I am using sip installed through the 
>>>> commands:
>>>> pip install PyQt-builder
>>>> pip install PyQt5-sip
>>>> and then by doing 'sip-install' in the PyQt5 source directory.
>>>> The error I get is, "sip-build: A debug version of Python must be 
>>>> used
>>>> when building a debug version of the <project> bindings".  My Python
>>>> installation has both debug (python_d.exe) and optimized 
>>>> (python.exe)
>>>> versions installed, as well as the corresponding libraries. However,
>>>> it appears that sip-build is installed as an executable (this is
>>>> Windows) so I can't choose my Python interpreter (I don't think?)
>>>> because it is baked in (?).
>>> You implicitly choose it when you chose the version of pip to install 
>>> it.
>>> Recent versions of Python have changed the way Windows debug versions
>>> are handled. This is not yet reflected in SIP.
>>>> Anyways it's important for my build system, to allow debug and
>>>> optimized builds to be able to be done side by side, so I need a way
>>>> to toggle between these. With sip v4, I could simply do the code
>>>> generation and then choose my own compiler options and link 
>>>> libraries,
>>>> to select debug versus optimized Python.
>>> Use sip-build with the --no-make option and run nmake overriding make
>>> variables on the command line (I'm assuming nmake works the same was
>>> as make in this respect).
>>> Phil

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