38 lines
1.6 KiB
Plaintext
38 lines
1.6 KiB
Plaintext
/*
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How the code in this directory is supposed to work...
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2020/05/22 Mark Geisert <mark@maxrnd.com>
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localtime.cc is the Cygwin-specific module that is compiled into
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the Cygwin DLL when the latter is built. It's just a wrapper that
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#defines a bunch of stuff then #includes localtime.c.
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localtime.c, at any point in time, is a reasonably recent version
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of /src/lib/libc/time/localtime.c from NetBSD. The same goes for
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private.h and tzfile.h. An empty namespace.h suffices for Cygwin.
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The idea is that in the future, one just needs to bring over newer
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versions of localtime.c, private.h, and/or tzfile.h from NetBSD as
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they become available.
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With luck, you can drop those files into this directory and they
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can be immediately used to build a newer Cygwin DLL that has the
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newer NetBSD functionality. Without luck, you'll have to tweak the
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wrapper localtime.cc. In the worst case, some other strategy will
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need to be figured out, such as manually pulling out the parts of
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the NetBSD code Cygwin needs to build a stand-alone localtime.cc.
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Re tz_posixrules.h: The data elements can be generated from
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/usr/share/zoneinfo/posixrules in any version of Cygwin's tzdata
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package. Instructions are in the comment leading tz_posixrules.h.
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Addendum:
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Implementation of the strategy above has uncovered a small number
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of NetBSD-isms in localtime.c that cannot be worked around with
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preprocessor tricks. So there is another file localtime.c.patched
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that holds just these adjustments for Cygwin, and it's this file
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that localtime.cc #includes. localtime.c.patched is generated by
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winsup/cygwin/Makefile[.in] operating with localtime.c.patch.
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..mark
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*/
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