nl_langinfo: fix multithread-safety bugs

[Bruno Haible]

This series of patches makes gnulib's nl_langinfo replacement multithread-safe.

The nl_langinfo of the various platforms is already multithread-safe (as shown
by the new unit test, which I let run for 30 seconds on each platform) -
nothing to fix on this side.


2019-12-17  Bruno Haible  <address@hidden>

        langinfo: Document more details.
        * doc/posix-headers/langinfo.texi: List platform details.
        * doc/posix-functions/nl_langinfo.texi: Likewise.

        nl_langinfo: Fix multithread-safety bug on mingw and MSVC.
        * lib/nl_langinfo.c (ctype_codeset, rpl_nl_langinfo): Use a
        stack-allocated buffer to assemble each result and different static
        buffers to return it.
        * tests/test-nl_langinfo-mt.c: New file.
        * modules/nl_langinfo-tests (Files): Add it.
        (Depends-on): Add thread, nanosleep.
        (Makefile.am): Build test-nl_langinfo-mt test.

        nl_langinfo: Fix multithread-safety bug on OpenBSD 3.8.
        * lib/nl_langinfo.c (ctype_codeset): Invoke setlocale_null instead of
        setlocale.
        * m4/nl_langinfo.m4 (gl_FUNC_NL_LANGINFO): Require
        gl_FUNC_SETLOCALE_NULL. Set LIB_NL_LANGINFO.
        * modules/nl_langinfo (Depends-on): Add setlocale-null.

0001-langinfo-Document-more-details.patch
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0002-nl_langinfo-Fix-multithread-safety-bug-on-mingw-and-.patch
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0003-nl_langinfo-Fix-multithread-safety-bug-on-OpenBSD-3..patch
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