[rootcling] Use longFlags for multi-character rootcling options

This replaces many usages of `shortflags` with multiple characters
whenever possible.

Some flags are omitted (e.g., `-writeEmptyRootPCM`) as they cause the diff
to be huge and can go in a separate PR.

Author: devajithvs

README/README.CXXMODULES.md

@@ -306,7 +306,7 @@ different. There are several differences which can be noticed:
   specific location. This way we 'mount' `/usr/include/module.modulemap`
   non-invasively. The reasons why we need to extend the C++ modules support
   beyond ROOT is described bellow.
-  * rootcling -cxxmodule creates a single artifact *Name.pcm* after the library
+  * rootcling --cxxmodule creates a single artifact *Name.pcm* after the library
   name. At a final stage, ROOT might be able to integrate the Name.pcm with the
   shared library itself.
   * Improved correctness in number of cases -- in a few cases ROOT is more
@@ -347,7 +347,7 @@ different. There are several differences which can be noticed:
   This command concatenates `header.h` twice before compiling it to make sure
   it has proper include protectors.
   * Enable it in `rootcling` -- rootcling can produce a C++ Modules-aware
-  dictionary when it is invoked with `-cxxmodule` flag.
+  dictionary when it is invoked with `--cxxmodule` flag.
   * Modularization of external dependencies -- if a header file is not explicitly
   nominated as part of a module and it is transitively included in two modules,
   both modules contain that header file content. In other words, the header is

bindings/pyroot/cppyy/cppyy/doc/source/utilities.rst

@@ -243,7 +243,7 @@ With ``genreflex``, the mapping file can be automatically created with
 ``--rootmap-lib=MyClassDict``, where "MyClassDict" is the name of the shared
 library (without the extension) build from the dictionary file.
 With ``rootcling``, create the same mapping file with
-``-rmf MyClassDict.rootmap -rml MyClassDict``.
+``--rmf MyClassDict.rootmap --rml MyClassDict``.
 It is necessary to provide the final library name explicitly, since it is
 only in the separate linking step where these names are fixed and those names
 may not match the default choice.

bindings/pyroot/cppyy/cppyy/test/make_dict_win32.py

@@ -63,7 +63,7 @@ def get_python_lib_dir():
     linkdef.write("#pragma link C++ defined_in %s.h;\n" % fn)
     linkdef.write("\n#endif")
 
-DICTIONARY_CMD = "python -m cppyy_backend._rootcling -f {fn}_rflx.cxx -rmf {fn}Dict.rootmap -rml {fn}Dict.dll {fn}.h {fn}Linkdef.h".format(fn=fn)
+DICTIONARY_CMD = "python -m cppyy_backend._rootcling -f {fn}_rflx.cxx --rmf {fn}Dict.rootmap --rml {fn}Dict.dll {fn}.h {fn}Linkdef.h".format(fn=fn)
 if os.system(DICTIONARY_CMD):
     sys.exit(1)
 

cmake/modules/RootMacros.cmake

@@ -554,7 +554,7 @@ function(ROOT_GENERATE_DICTIONARY dictionary)
   set(pcm_name ${library_output_dir}/${libprefix}${library_output_name}_rdict.pcm)
   if(ARG_MODULE)
     if(ARG_MULTIDICT)
-      set(newargs ${newargs} -multiDict)
+      set(newargs ${newargs} --multiDict)
       set(pcm_name ${library_output_dir}/${libprefix}${library_output_name}_${dictionary}_rdict.pcm)
       set(rootmap_name ${library_output_dir}/${libprefix}${library_output_name}32.rootmap)
     else()
@@ -595,7 +595,7 @@ function(ROOT_GENERATE_DICTIONARY dictionary)
     set(rootmap_name)
     set(rootmapargs)
   else()
-    set(rootmapargs -rml ${library_name} -rmf ${rootmap_name})
+    set(rootmapargs --rml ${library_name} --rmf ${rootmap_name})
   endif()
 
   #---Get the library and module dependencies-----------------
@@ -621,7 +621,7 @@ function(ROOT_GENERATE_DICTIONARY dictionary)
   endif()
 
   if(cpp_module_file)
-    set(newargs -cxxmodule ${newargs})
+    set(newargs --cxxmodule ${newargs})
   endif()
 
   #---what rootcling command to use--------------------------
@@ -632,9 +632,9 @@ function(ROOT_GENERATE_DICTIONARY dictionary)
   else()
     if(CMAKE_PROJECT_NAME STREQUAL ROOT)
       if(MSVC AND CMAKE_ROOTTEST_DICT)
-        set(command ${CMAKE_COMMAND} -E env "ROOTIGNOREPREFIX=1" ${CMAKE_BINARY_DIR}/bin/rootcling.exe -rootbuild)
+        set(command ${CMAKE_COMMAND} -E env "ROOTIGNOREPREFIX=1" ${CMAKE_BINARY_DIR}/bin/rootcling.exe --rootbuild)
       else()
-        set(command ${CMAKE_COMMAND} -E env "ROOTIGNOREPREFIX=1" $<TARGET_FILE:rootcling> -rootbuild)
+        set(command ${CMAKE_COMMAND} -E env "ROOTIGNOREPREFIX=1" $<TARGET_FILE:rootcling> --rootbuild)
         # Modules need RConfigure.h copied into include/.
         set(ROOTCLINGDEP rootcling rconfigure)
       endif()
@@ -648,7 +648,7 @@ function(ROOT_GENERATE_DICTIONARY dictionary)
   #---build the path exclusion switches----------------------
   set(excludepathsargs "")
   foreach(excludepath ${excludepaths})
-    set(excludepathsargs ${excludepathsargs} -excludePath ${excludepath})
+    set(excludepathsargs ${excludepathsargs} --excludePath ${excludepath})
   endforeach()
 
   #---build the implicit dependencies arguments
@@ -686,7 +686,7 @@ function(ROOT_GENERATE_DICTIONARY dictionary)
 
   set(compIncPaths)
   foreach(implinc IN LISTS CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES)
-    list(APPEND compIncPaths "-compilerI${implinc}")
+    list(APPEND compIncPaths "--compilerI${implinc}")
   endforeach()
 
   if(cpp_module_file AND TARGET ${ARG_MODULE})

config/Makefile.in

@@ -42,7 +42,7 @@ rmfName = $(dir $1)$(subst .$(SOEXT),.rootmap,$(notdir $1))
 # generate the rootmap file
 #    $(call rootmapModule, TREELIB)
 # the argument is the upper case name of the library (see the Module.mk)
-rootmapModule = -rml $(notdir $1) -rmf $(call rmfName, $1)
+rootmapModule = --rml $(notdir $1) --rmf $(call rmfName, $1)
 
 # This macro returns the argument to be passed to rootcling to
 # properly setup the pcm

core/CMakeLists.txt

@@ -123,12 +123,12 @@ target_compile_definitions(Core PRIVATE
  )
 
 if (runtime_cxxmodules)
-  list(APPEND core_implicit_modules "-mSystemByproducts")
+  list(APPEND core_implicit_modules "--mSystemByproducts")
   # Force generation of _Builtin_intrinsics from Core.
-  list(APPEND core_implicit_modules "-m" "_Builtin_intrinsics" "-mByproduct" "_Builtin_intrinsics")
-  list(APPEND core_implicit_modules "-mByproduct" "ROOT_Foundation_Stage1_NoRTTI")
-  list(APPEND core_implicit_modules "-mByproduct" "ROOT_Foundation_C")
-  list(APPEND core_implicit_modules "-mByproduct" "ROOT_Rtypes")
+  list(APPEND core_implicit_modules "-m" "_Builtin_intrinsics" "--mByproduct" "_Builtin_intrinsics")
+  list(APPEND core_implicit_modules "--mByproduct" "ROOT_Foundation_Stage1_NoRTTI")
+  list(APPEND core_implicit_modules "--mByproduct" "ROOT_Foundation_C")
+  list(APPEND core_implicit_modules "--mByproduct" "ROOT_Rtypes")
 endif(runtime_cxxmodules)
 
 get_target_property(CORE_DICT_HEADERS Core DICT_HEADERS)

core/base/src/TSystem.cxx

@@ -3557,7 +3557,7 @@ int TSystem::CompileMacro(const char *filename, Option_t *opt,
    rcling.Append(dict).Append("\" ");
 
    if (produceRootmap && !useCxxModules) {
-      rcling += " -rml " + libname + " -rmf \"" + libmapfilename + "\" ";
+      rcling += " --rml " + libname + " --rmf \"" + libmapfilename + "\" ";
       rcling.Append("-DR__ACLIC_ROOTMAP ");
    }
    rcling.Append(GetIncludePath()).Append(" -D__ACLIC__ ");
@@ -3575,7 +3575,7 @@ int TSystem::CompileMacro(const char *filename, Option_t *opt,
    // Create a modulemap
    // FIXME: Merge the modulemap generation from cmake and here in rootcling.
    if (useCxxModules && produceRootmap) {
-      rcling += " -cxxmodule ";
+      rcling += " --cxxmodule ";
       // TString moduleMapFileName = file_dirname + "/" + libname + ".modulemap";
       TString moduleName = libname + "_ACLiC_dict";
       if (moduleName.BeginsWith("lib"))
@@ -3596,7 +3596,7 @@ int TSystem::CompileMacro(const char *filename, Option_t *opt,
       moduleMapFile << "}" << std::endl;
       moduleMapFile.close();
       gInterpreter->RegisterPrebuiltModulePath(build_loc.Data(), moduleMapName.Data());
-      rcling.Append(" \"-moduleMapFile=" + moduleMapFullPath + "\" ");
+      rcling.Append(" \"--moduleMapFile=" + moduleMapFullPath + "\" ");
    }
 
    rcling.Append(" \"").Append(filename_fullpath).Append("\" ");

core/dictgen/src/rootcling-argparse.py

@@ -99,11 +99,11 @@ def get_argparse():
 will not include any of the declarations already included in the
 pcm files loaded via -m.  There can be more than one -m
 """)
-	parser.add_argument('-rmf', help="""Rootmap file name
+	parser.add_argument('--rmf', help="""Rootmap file name
 Name of the rootmap file. In order to be picked up by ROOT it must
 have .rootmap extension
 """)
-	parser.add_argument('-rml', help="""Rootmap library name
+	parser.add_argument('--rml', help="""Rootmap library name
 Specify the name of the library which contains the autoload keys. This
 switch can be specified multiple times to autoload several libraries in
 presence of a particular key
@@ -124,17 +124,17 @@ def get_argparse():
    3) If this is specified in conjunction with --multiDict, the output is
       libTARGETLIBRARY_DICTIONARY_rdict.pcm
 """)
-	parser.add_argument('-multiDict', help="""Enable support for multiple pcms in one library
+	parser.add_argument('--multiDict', help="""Enable support for multiple pcms in one library
 Needs the -s flag. See its documentation.
 """)
-	parser.add_argument('-inlineInputHeader', help="""Add the argument header to the code of the dictionary
+	parser.add_argument('--inlineInputHeader', help="""Add the argument header to the code of the dictionary
 This allows the header to be inlined within the dictionary
 """)
-	parser.add_argument('-interpreteronly', help='No IO information in the dictionary\n')
+	parser.add_argument('--interpreteronly', help='No IO information in the dictionary\n')
 	parser.add_argument('-noIncludePaths', help="""Do not store the headers' directories in the dictionary
 Instead, rely on the environment variable $ROOT_INCLUDE_PATH at runtime
 """)
-	parser.add_argument('-excludePath', help="""Specify a path to be excluded from the include paths
+	parser.add_argument('--excludePath', help="""Specify a path to be excluded from the include paths
 specified for building this dictionary
 """)
 	parser.add_argument('--lib-list-prefix', help="""Specify libraries needed by the header files parsed