Most changes are to get plugins working.
libdispatchdreg.c went in in unidata/netcdf-c#2460,
after I'd done it here.
Summary of individual changes below.
BLD: Remove declspec(dllexport); in dreg.c.
By removing the explicit handling, the automatic handling
(equivalent to --export-all-symbols with recent GNU tools)
will be enabled again, so the generated library will have
more than one function exported.
BLD: Link plugins against libnetcdf on Cygwin.
BLD: Add AM_LDFLAGS to plugin _LDFLAGS to pass -no-undefined.
BLD: Link ncz*filters plugins against libnetcdf.
BLD: Add AM_LDFLAGS to test plugin _LDFLAGS.
Also move rpath from AM_LDFLAGS to test plugin _LDFLAGS.
TST: Don't run nczarr_test/run_specific_filters.sh on Cygwin.
It takes over half an hour to complete, where the others take a minute or less.
TST: Try to find the hanging Cygwin test.
re:
The current netcdf-c release has some problems with the mingw platform
on windows. Mostly they are path issues.
Changes to support mingw+msys2:
-------------------------------
* Enable option of looking into the windows registry to find
the mingw root path. In aid of proper path handling.
* Add mingw+msys as a specific platform in configure.ac and move testing
of the platform to the front so it is available early.
* Handle mingw X libncpoco (dynamic loader) properly even though
mingw does not yet support it.
* Handle mingw X plugins properly even though mingw does not yet support it.
* Alias pwd='pwd -W' to better handle paths in shell scripts.
* Plus a number of other minor compile irritations.
* Disallow the use of multiple nc_open's on the same file for windows
(and mingw) because windows does not seem to handle these properly.
Not sure why we did not catch this earlier.
* Add mountpoint info to dpathmgr.c to help support mingw.
* Cleanup dpathmgr conversions.
Known problems:
---------------
* I have not been able to get shared libraries to work, so
plugins/filters must be disabled.
* There is some kind of problem with libcurl that I have not solved,
so all uses of libcurl (currently DAP+Byterange) must be disabled.
Misc. other fixes:
------------------
* Cleanup the relationship between ENABLE_PLUGINS and various other flags
in CMakeLists.txt and configure.ac.
* Re-arrange the TESTDIRS order in Makefile.am.
* Add pseudo-breakpoint to nclog.[ch] for debugging.
* Improve the documentation of the path manager code in ncpathmgr.h
* Add better support for relative paths in dpathmgr.c
* Default the mode args to NCfopen to include "b" (binary) for windows.
* Add optional debugging output in various places.
* Make sure that everything builds with plugins disabled.
* Fix numerous (s)printf inconsistencies betweenb the format spec
and the arguments.
