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Thomas Munro 1758d42446 Require ucrt if using MinGW. ... Historically we tolerated the absence of various C runtime library features for the benefit of the MinGW tool chain, because it used ancient msvcrt.dll for a long period of time. It now uses ucrt by default (like Windows 10+, Visual Studio 2015+), and that's the only configuration we're testing. In practice, we effectively required ucrt already in PostgreSQL 17, when commit 8d9a9f03 required _create_locale etc, first available in msvcr120.dll (Visual Studio 2013, the last of the pre-ucrt series of runtimes), and for MinGW users that practically meant ucrt because it was difficult or impossible to use msvcr120.dll. That may even not have been the first such case, but old MinGW configurations had already dropped off our testing radar so we weren't paying much attention. This commit formalizes the requirement. It also removes a couple of obsolete comments that discussed msvcrt.dll limitations, and some tests of !defined(_MSC_VER) to imply msvcrt.dll. There are many more anachronisms, but it'll take some time to figure out how to remove them all. APIs affected relate to locales, UTF-8, threads, large files and more. Thanks to Peter Eisentraut for the documentation change. It's not really necessary to talk about ucrt explicitly in such a short section, since it's the default for MinGW-w64 and MSYS2. It's enough to prune references and broken links to much older tools. Reviewed-by: Peter Eisentraut <peter@eisentraut.org> Discussion: https://postgr.es/m/d9e7731c-ca1b-477c-9298-fa51e135574a%40eisentraut.org		2 years ago
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src	Require ucrt if using MinGW.	2 years ago
KNOWN_BUGS	…
MISSING_FEATURES	…
Makefile	Remove distprep	3 years ago
TODO	…