[Python-ideas] Allow to compile debug extension against releasePython in Windows
vano at mail.mipt.ru
Tue Jan 9 13:46:37 EST 2018
On 09.01.2018 21:35, Ivan Pozdeev via Python-ideas wrote:
> On 08.01.2018 0:11, Steve Dower wrote:
>> It’s not a good idea. You end up with two different C runtimes in
>> memory that cannot communicate, and many things will not work properly.
>> If you compile your debug build extension with the non-debug CRT (/MD
>> rather than /MDd) you will lose asserts, but otherwise it will work
>> fine and the quoted code picks the release lib.
> Distutils' designers seem to have thought differently.
> Whether the extension is linked against pythonxx_d.lib is governed by
> the --debug switch to the `build' command rather than the type of the
> running Python. Compiler optimization flags and /MD(d) are inserted
> according to it, too.
> As a consequence,
> * I cannot install an extension into debug Python at all 'cuz
> `bdist_*' and `install' commands don't support --debug and invoke
> `debug' internally without it.
I meant "invoke `build' internally without it." , sorry.
This kafkaesque "you cannot do this because you cannot do this" is
taking its toll on me...
> * Neither can I compile an extension for release Python without
> I'm at a loss here. Either I'm missing something, or with the current
> build system, it's impossible to debug extensions!
>> Or if you like, when you install Python 3.5 or later there are
>> advanced options to install debug symbols and binaries. You can use a
>> proper debug build against the debug binaries (python_d.exe).
>> Top-posted from my Windows phone
>> *From: *Ivan Pozdeev via Python-ideas <mailto:python-ideas at python.org>
>> *Sent: *Saturday, December 30, 2017 13:01
>> *To: *python-ideas at python.org <mailto:python-ideas at python.org>
>> *Subject: *[Python-ideas] Allow to compile debug extension against
>> releasePython in Windows
>> The Windows version of pyconfig.h has the following construct:
>> if defined(_DEBUG)
>> pragma comment(lib,"python37_d.lib")
>> elif defined(Py_LIMITED_API)
>> pragma comment(lib,"python3.lib")
>> pragma comment(lib,"python37.lib")
>> endif /* _DEBUG */
>> which fails the compilation of a debug version of an extension. Making
>> debugging it... difficult.
>> Perhaps we could define some other constant?
>> I'm not sure whether such compilation is a good idea in general, so
>> asking here at first.
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