GH-131296: fix clang-cl warning on Windows in socketmodule.c

[chris-eibl]

I think this is a skip news?

• Issue: clang-cl issues many warnings when building on Windows #131296

[chris-eibl]

fix warning : incompatible pointer types passing 'int *' to parameter of type 'LPDWORD' (aka 'unsigned long *') [-Wincompatible-pointer-types]

[chris-eibl]

The rest of the PR cares about deprecation warnings like

..\Modules\socketmodule.c(6070,9): warning : 'gethostbyname' is deprecated:
Use getaddrinfo() or GetAddrInfoW() instead or define _WINSOCK_DEPRECATED_NO_WARNINGS
to disable deprecated API warnings [-Wdeprecated-declarations]

https://github.com/python/cpython/actions/runs/14044831663/job/39366560293?pr=131690#step:4:183

using the already existing infrastructure _Py_COMP_DIAG_PUSH et al. from pyport.h, because clang-cl unfortunately does not (yet) respect

# define SUPPRESS_DEPRECATED_CALL __pragma(warning(suppress: 4996))

[zooba]

Is there another way to spell the pragma that will work? The idea of pyport.h is to deal with compiler differences as much as possible, so it's the place to handle it if the original macro can be made to work.

[chris-eibl]

clang-cl does not understand suppress, hence I need to push and pop and thus used the existing infrastructure from pyport.h (warning(disable: 4996))

cpython/Include/pyport.h

Lines 308 to 311 in 0045100

	#elif defined(_MSC_VER)
	#define _Py_COMP_DIAG_PUSH __pragma(warning(push))
	#define _Py_COMP_DIAG_IGNORE_DEPR_DECLS __pragma(warning(disable: 4996))
	#define _Py_COMP_DIAG_POP __pragma(warning(pop))

Likewise, AFAIK, there is no supress in gcc / "regular" clang, so we need to always push / pop there.

[chris-eibl]

I am pretty sure that failing of Ubuntu (free-threading) / build and test (ubuntu-24.04) (pull_request) is unrelated to the PR.

[python-cla-bot]

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[chris-eibl]

@zooba May I ask you for a review?

[neonene]

nit: Two space indents of preprocessor directives might be uncommon in CPython except when a line starts with # .

[chris-eibl]

I indented everywhere by two spaces to easier spot the macros, but I will happily indent by four spaces if this is preferred.

[neonene]

I'd prefer to avoid thinking of the intention when reading, so +1 for four spaces.

[chris-eibl]

Done. I had a look at the other occurrences in the code base: either no indentation or like the code they guard.

I switched to the latter.

[zooba]

LGTM. I'll merge after CI is done unless something else comes up (or if someone else sees this and can merge, go ahead)