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8b0e1134b4
re: Issue https://github.com/Unidata/netcdf-c/issues/2419 There are effectively two json subsystems in netcdf-c. 1. ncjson.[ch] in libnetcdf 2. netcdf_json.h for use by plugins so they can be built without need for libnetcdf. The netcdf_json.h file is constructed from the concatenation of ncjson.h plus ncjson.c. It turned out that in doing this, I was leaving some symbols externally visible so that if, for some reason, a plugin was built and needed libnetcdf, then symbol conflicts arose. The solution is to prefix the declarations in ncjson.[ch] with a macro (OPTSTATIC) that can be resolved to either nothing or to "static". Then in netcdf_json.h, it resolves to "static" and prevents the symbol conflicts. Note that netcdf_json.h is constructed once in netcdf-c/include/Makefile.am with the rule named "makepluginjson". This means that it is included in the distribution. However, this also means that if ncjson.[ch] is changed, then it is necessary to invoke makepluginjson explicitly to rebuild netcdf_json.h
47 lines
1.8 KiB
Makefile
47 lines
1.8 KiB
Makefile
## This is a automake file, part of Unidata's netCDF package.
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# Copyright 2018, see the COPYRIGHT file for more information.
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# This automake file generates the Makefile to build the include
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# directory.
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# Ed Hartnett, Dennis Heimbigner, Ward Fisher
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include_HEADERS = netcdf.h netcdf_meta.h netcdf_mem.h netcdf_aux.h \
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netcdf_filter.h netcdf_filter_build.h netcdf_filter_hdf5_build.h netcdf_dispatch.h netcdf_json.h
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if BUILD_PARALLEL
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include_HEADERS += netcdf_par.h
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endif
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noinst_HEADERS = nc_logging.h nc_tests.h fbits.h nc.h nclist.h \
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ncuri.h ncutf8.h ncdispatch.h ncdimscale.h netcdf_f.h err_macros.h \
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ncbytes.h nchashmap.h ceconstraints.h rnd.h nclog.h ncconfigure.h \
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nc4internal.h nctime.h nc3internal.h onstack.h ncrc.h ncauth.h \
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ncoffsets.h nctestserver.h nc4dispatch.h nc3dispatch.h ncexternl.h \
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ncpathmgr.h ncindex.h hdf4dispatch.h hdf5internal.h nc_provenance.h \
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hdf5dispatch.h ncmodel.h isnan.h nccrc.h ncexhash.h ncxcache.h \
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ncjson.h ncxml.h ncs3sdk.h
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if USE_DAP
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noinst_HEADERS += ncdap.h
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endif
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if ENABLE_BYTERANGE
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noinst_HEADERS += nchttp.h
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endif
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EXTRA_DIST = CMakeLists.txt XGetopt.h netcdf_meta.h.in netcdf_dispatch.h.in
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# netcdf_json.h is constructed as a header-only file for use by
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# nczarr code wrappers in the plugin directory. It is
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# constructed by joining libdispatch/ncjson.c with
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# include/ncjson.h. Additionally all the entry points are
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# marked with a macro (OPTSTATIC) that marks the entry point as
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# static inside netcdf_json.h. This is an ugly hack to avoid
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# having to reference libnetcdf in the nczarr code wrappers.
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# Give the recipe for rebuilding netcdf_json.h
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makepluginjson::
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sed -e 's/NCJSON_H/NETCDF_JSON_H/' -e '/ncjson.h/d' <${srcdir}/ncjson.h > netcdf_json.h
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sed -e '/ncjson.h/d' < ${srcdir}/../libdispatch/ncjson.c >> netcdf_json.h
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