"Simplify" XGetopt usage

When "getopt()" is not available, various of the netcdf-c utilities
use XGetopt instead. This occurs primarily when building under Window,
so the build changes are restricted to CMake.

This PR tries to isolate XGetopt.c to the libdispatch directory
and then builds the various utilities using this cliche:
````
IF(USE_X_GETOPT)
  SET(XGETOPTSRC "${CMAKE_CURRENT_SOURCE_DIR}/../libdispatch/XGetopt.c")
ENDIF()
````

This avoids the need to copy XGetopt.c to all the directories that
use it.

CMakeLists.txt

@@ -1249,18 +1249,6 @@ IF(MSVC)
   OPTION(ENABLE_XGETOPT "Enable bundled XGetOpt instead of external getopt()." ON)
   IF(ENABLE_XGETOPT)
     SET(USE_X_GETOPT ON CACHE BOOL "")
-    # Copy XGetopt.c to everywhere it is needed. Avoids
-    # inconsistent code
-    FILE(COPY ${netCDF_SOURCE_DIR}/libsrc/XGetopt.c
-         DESTINATION ${netCDF_BINARY_DIR}/ncgen3/)
-    FILE(COPY ${netCDF_SOURCE_DIR}/libsrc/XGetopt.c
-         DESTINATION ${netCDF_BINARY_DIR}/ncgen/)
-    FILE(COPY ${netCDF_SOURCE_DIR}/libsrc/XGetopt.c
-         DESTINATION ${netCDF_BINARY_DIR}/ncdump/)
-    FILE(COPY ${netCDF_SOURCE_DIR}/libsrc/XGetopt.c
-         DESTINATION ${netCDF_BINARY_DIR}/nczarr_test/)
-    FILE(COPY ${netCDF_SOURCE_DIR}/libsrc/XGetopt.c
-         DESTINATION ${netCDF_BINARY_DIR}/ncdap_test/)
   ENDIF()
 ENDIF()
 

libdispatch/Makefile.am

@@ -56,7 +56,7 @@ if REGEDIT
 libdispatch_la_SOURCES += dreg.c
 endif
 
-EXTRA_DIST=CMakeLists.txt ncsettings.hdr utf8proc_data.c
+EXTRA_DIST = CMakeLists.txt ncsettings.hdr utf8proc_data.c XGetopt.c
 
 # Build ncsettings.c as follows:
 # 1. copy ncsettings.hdr to ncsettings.c

libsrc/Makefile.am

@@ -45,7 +45,7 @@ noinst_LTLIBRARIES = libnetcdf3.la
 # with m4), but they are included in the distribution so that the user
 # does not have to have m4.
 MAINTAINERCLEANFILES = $(man_MANS) attr.c ncx.c putget.c
-EXTRA_DIST = attr.m4 ncx.m4 putget.m4 $(man_MANS) CMakeLists.txt XGetopt.c
+EXTRA_DIST = attr.m4 ncx.m4 putget.m4 $(man_MANS) CMakeLists.txt
 
 # This tells make how to turn .m4 files into .c files.
 .m4.c:

ncdump/CMakeLists.txt

@@ -11,25 +11,19 @@
 
 SET(RCMERGE OFF)
 
-SET(ncdump_FILES ncdump.c vardata.c dumplib.c indent.c nctime0.c utils.c nciter.c)
-SET(nccopy_FILES nccopy.c nciter.c chunkspec.c utils.c dimmap.c list.c)
-SET(ocprint_FILES ocprint.c)
-SET(ncvalidator_FILES ncvalidator.c)
-SET(printfqn_FILES printfqn.c)
-SET(ncpathcvt_FILES ncpathcvt.c)
-SET(ncfilteravail_FILES ncfilteravail.c)
-SET(nchdf5version_FILES nchdf5version.c)
-
 IF(USE_X_GETOPT)
-  SET(ncdump_FILES ${ncdump_FILES} XGetopt.c)
-  SET(nccopy_FILES ${nccopy_FILES} XGetopt.c)
-  SET(ocprint_FILES ${ocprint_FILES} XGetopt.c)
-  SET(ncvalidator_FILES ${ncvalidator_FILES} XGetopt.c)
-  SET(printfqn_FILES ${printfqn_FILES} XGetopt.c)
-  SET(ncpathcvt_FILES ${ncpathcvt_FILES} XGetopt.c)
-  SET(ncfilteravail_FILES ${ncfilteravail_FILES} XGetopt.c)
-ENDIF(USE_X_GETOPT)
+SET(XGETOPTSRC "${CMAKE_CURRENT_SOURCE_DIR}/../libdispatch/XGetopt.c")
+ENDIF()
 
+SET(ncdump_FILES ncdump.c vardata.c dumplib.c indent.c nctime0.c utils.c nciter.c ${XGETOPTSRC})
+SET(nccopy_FILES nccopy.c nciter.c chunkspec.c utils.c dimmap.c list.c ${XGETOPTSRC})
+SET(ocprint_FILES ocprint.c ${XGETOPTSRC})
+SET(ncvalidator_FILES ncvalidator.c ${XGETOPTSRC})
+SET(printfqn_FILES printfqn.c ${XGETOPTSRC})
+SET(ncpathcvt_FILES ncpathcvt.c ${XGETOPTSRC})
+SET(ncfilteravail_FILES ncfilteravail.c ${XGETOPTSRC})
+SET(nchdf5version_FILES nchdf5version.c)
+
 ADD_EXECUTABLE(ncdump ${ncdump_FILES})
 ADD_EXECUTABLE(nccopy ${nccopy_FILES})
 ADD_EXECUTABLE(ncvalidator ${ncvalidator_FILES})
@@ -181,21 +175,21 @@ endif()
     build_bin_test_no_prefix(tst_h_rdc0)
     build_bin_test_no_prefix(tst_unicode)
     build_bin_test_no_prefix(tst_vlen_data)
-    add_bin_test_no_prefix(tst_create_files)
-    add_bin_test_no_prefix(tst_opaque_data)
-    add_bin_test_no_prefix(tst_string_data)
-    add_bin_test_no_prefix(tst_comp2)
-    add_bin_test_no_prefix(tst_nans)
-    add_bin_test_no_prefix(tst_h_scalar)
-    add_bin_test_no_prefix(tst_compress)
-    add_bin_test_no_prefix(tst_chunking)
-    add_bin_test_no_prefix(tst_group_data)
-    add_bin_test_no_prefix(tst_enum_data)
-    add_bin_test_no_prefix(tst_enum_undef)
-    add_bin_test_no_prefix(tst_comp)
+    build_bin_test_no_prefix(tst_create_files)
+    build_bin_test_no_prefix(tst_opaque_data)
+    build_bin_test_no_prefix(tst_string_data)
+    build_bin_test_no_prefix(tst_comp2)
+    build_bin_test_no_prefix(tst_nans)
+    build_bin_test_no_prefix(tst_h_scalar)
+    build_bin_test_no_prefix(tst_compress)
+    build_bin_test_no_prefix(tst_chunking)
+    build_bin_test_no_prefix(tst_group_data)
+    build_bin_test_no_prefix(tst_enum_data)
+    build_bin_test_no_prefix(tst_enum_undef)
+    build_bin_test_no_prefix(tst_comp)
     # Add this test by hand, as it is also called from a script.
     # Editing the script would break autotools compatibility.
-    add_bin_test_no_prefix(tst_special_atts)
+    build_bin_test_no_prefix(tst_special_atts)
   ENDIF(USE_HDF5)
 
   # Base tests

ncgen/CMakeLists.txt

@@ -9,22 +9,22 @@ IF(BUILD_SHARED_LIBS AND WIN32)
   remove_definitions(-DDLL_NETCDF)
 ENDIF()
 
+IF(USE_X_GETOPT)
+  SET(XGETOPTSRC "${CMAKE_CURRENT_SOURCE_DIR}/../libdispatch/XGetopt.c")
+ENDIF()
+
 SET(ncgen_FILES bindata.c bytebuffer.c cdata.c cvt.c data.c
 debug.c dump.c escapes.c f77data.c genbin.c
 genc.c genchar.c generate.c generr.c genf77.c
 genj.c genlib.c getfill.c jdata.c list.c
 main.c ncgeny.c semantics.c
 util.c bytebuffer.h data.h debug.h dump.h
 generate.h generr.h genlib.h includes.h list.h
-ncgen.h ncgeny.h util.h)
+ncgen.h ncgeny.h util.h ${XGETOPTSRC})
 
 # Obsolete
 SET(OBSOLETE odom.c odom.h jdatastd.c jdatajni.c genjni.c cdfdata.c cmldata.c)
 
-IF(USE_X_GETOPT)
-  SET(ncgen_FILES ${ncgen_FILES} XGetopt.c)
-ENDIF()
-
 # don't add the automatically determined parts of the RPATH
 # which point to directories outside the build tree to the install RPATH
 SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH FALSE)

ncgen3/CMakeLists.txt

@@ -3,13 +3,14 @@
 # 2015, 2016, 2017, 2018
 # University Corporation for Atmospheric Research/Unidata.
 
-# See netcdf-c/COPYRIGHT file for more info.
-SET(ncgen3_FILES main.c load.c escapes.c getfill.c init.c genlib.c ncgeny.c)
 
 IF(USE_X_GETOPT)
-  SET(ncgen3_FILES ${ncgen3_FILES} XGetopt.c)
+  SET(XGETOPTSRC "${CMAKE_CURRENT_SOURCE_DIR}/../libdispatch/XGetopt.c")
 ENDIF()
 
+# See netcdf-c/COPYRIGHT file for more info.
+SET(ncgen3_FILES main.c load.c escapes.c getfill.c init.c genlib.c ncgeny.c ${XGETOPTSRC})
+
 FILE(GLOB COPY_FILES ${CMAKE_CURRENT_SOURCE_DIR}/*.nc ${CMAKE_CURRENT_SOURCE_DIR}/*.sh ${CMAKE_CURRENT_SOURCE_DIR}/*.cdl)
 FILE(COPY ${COPY_FILES} DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/ FILE_PERMISSIONS OWNER_WRITE OWNER_READ OWNER_EXECUTE)
 

nczarr_test/CMakeLists.txt

@@ -40,17 +40,15 @@ ${CMAKE_CURRENT_SOURCE_DIR}/ref*.zmap)
 
 FILE(COPY ${COPY_FILES} DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/ FILE_PERMISSIONS OWNER_WRITE OWNER_READ OWNER_EXECUTE)
 
+IF(USE_X_GETOPT)
+SET(XGETOPTSRC "${CMAKE_CURRENT_SOURCE_DIR}/../libdispatch/XGetopt.c")
+ENDIF()
+
 IF(ENABLE_TESTS)
 
-  SET(COMMONSRC ut_util.c ut_test.c)
-  IF(USE_X_GETOPT)
-    SET(COMMONSRC ${COMMONSRC} XGetopt.c)
-  ENDIF()
+  SET(COMMONSRC ut_util.c ut_test.c ${XGETOPTSRC})
 
-  SET(TSTCOMMONSRC tst_utils.c)
-  IF(USE_X_GETOPT)
-    SET(TSTCOMMONSRC ${TSTCOMMONSRC} XGetopt.c)
-  ENDIF()
+  SET(TSTCOMMONSRC tst_utils.c ${XGETOPTSRC})
 
   # Base tests
   # The tests are set up as a combination of shell scripts and executables that
@@ -91,9 +89,7 @@ IF(ENABLE_TESTS)
   endif()
 
   SET(ncdumpchunks_SOURCE ncdumpchunks.c)
-  IF(USE_X_GETOPT)
-    SET(ncdumpchunks_SOURCE ${ncdumpchunks_SOURCE} XGetopt.c)
-  ENDIF()
+  SET(ncdumpchunks_SOURCE ${ncdumpchunks_SOURCE} ${XGETOPTSRC})
   BUILD_BIN_TEST(ncdumpchunks ${ncdumpchunks_SOURCE})
   TARGET_INCLUDE_DIRECTORIES(ncdumpchunks PUBLIC ../libnczarr)