Preserving forwarding of empty string arguments

Also:
- Support cmake-format on Windows
- Auto fixes some whitespace
- `CPMFindPackage` not updated

.cmake-format

@@ -1,6 +1,7 @@
 format:
  tab_size: 2
  line_width: 100
+ line_ending: auto
  dangle_parens: true
 
 parse:

cmake/CPM.cmake

@@ -506,16 +506,34 @@ function(cpm_override_fetchcontent contentName)
 endfunction()
 
 # Download and add a package from source
-function(CPMAddPackage)
+macro(CPMAddPackage)
+ set(__ARGN "${ARGN}")
+ list(LENGTH __ARGN __ARGN_Length)
+ if(__ARGN_Length EQUAL 1)
+ cpm_add_package_single_arg(${ARGN})
+ else()
+ # Forward preserving empty string arguments
+ # (https://gitlab.kitware.com/cmake/cmake/-/merge_requests/4729)
+ set(__ARGN_Quoted)
+ foreach(__ARG IN LISTS __ARGN)
+ string(APPEND __ARGN_Quoted " [==[${__ARG}]==]")
+ endforeach()
+ cmake_language(EVAL CODE "cpm_add_package_multi_arg( ${__ARGN_Quoted} )")
+ endif()
+endmacro()
+
+function(cpm_add_package_single_arg arg)
  cpm_set_policies()
+ cpm_parse_add_package_single_arg("${arg}" ARGN)
 
- list(LENGTH ARGN argnLength)
- if(argnLength EQUAL 1)
- cpm_parse_add_package_single_arg("${ARGN}" ARGN)
+ # The shorthand syntax implies EXCLUDE_FROM_ALL
+ list(APPEND ARGN EXCLUDE_FROM_ALL YES)
 
- # The shorthand syntax implies EXCLUDE_FROM_ALL and SYSTEM
- set(ARGN "${ARGN};EXCLUDE_FROM_ALL;YES;SYSTEM;YES;")
- endif()
+ cpm_add_package_multi_arg(${ARGN}) # Forward function arguments to CPMAddPackage()
+endfunction()
+
+function(cpm_add_package_multi_arg)
+ cpm_set_policies()
 
  set(oneValueArgs
  NAME
@@ -531,15 +549,14 @@ function(CPMAddPackage)
  DOWNLOAD_COMMAND
  FIND_PACKAGE_ARGUMENTS
  NO_CACHE
- SYSTEM
  GIT_SHALLOW
  EXCLUDE_FROM_ALL
  SOURCE_SUBDIR
  )
 
  set(multiValueArgs URL OPTIONS)
 
- cmake_parse_arguments(CPM_ARGS "" "${oneValueArgs}" "${multiValueArgs}" "${ARGN}")
+ cmake_parse_arguments(PARSE_ARGV 0 CPM_ARGS "" "${oneValueArgs}" "${multiValueArgs}")
 
  # Set default values for arguments
 
@@ -647,7 +664,7 @@ function(CPMAddPackage)
  cpm_check_if_package_already_added(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}")
  return()
  endif()
-
+ 
  if(NOT CPM_ARGS_FORCE)
  if(CPM_USE_LOCAL_PACKAGES OR CPM_LOCAL_PACKAGES_ONLY)
  cpm_find_package(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}" ${CPM_ARGS_FIND_PACKAGE_ARGUMENTS})
@@ -917,7 +934,13 @@ function(cpm_declare_fetch PACKAGE VERSION INFO)
  return()
  endif()
 
- FetchContent_Declare(${PACKAGE} ${ARGN})
+ # Forward preserving empty string arguments
+ # (https://gitlab.kitware.com/cmake/cmake/-/merge_requests/4729)
+ set(__argsQuoted)
+ foreach(__item IN LISTS ARGN)
+ string(APPEND __argsQuoted " [==[${__item}]==]")
+ endforeach()
+ cmake_language(EVAL CODE "FetchContent_Declare(${PACKAGE} ${__argsQuoted} )")
 endfunction()
 
 # returns properties for a package previously defined by cpm_declare_fetch
@@ -1105,7 +1128,7 @@ function(cpm_prettify_package_arguments OUT_VAR IS_IN_COMMENT)
  GIT_SHALLOW
  )
  set(multiValueArgs OPTIONS)
- cmake_parse_arguments(CPM_ARGS "" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+ cmake_parse_arguments(PARSE_ARGV 0 CPM_ARGS "" "${oneValueArgs}" "${multiValueArgs}")
 
  foreach(oneArgName ${oneValueArgs})
  if(DEFINED CPM_ARGS_${oneArgName})