update CPM.cmake (#42)

cmake/CPM.cmake

@@ -1,6 +1,6 @@
-# TheLartians/CPM - A simple Git dependency manager
+# CPM.cmake - CMake's missing package manager
-# =================================================
+# ===========================================
-# See https://github.com/TheLartians/CPM for usage and update instructions.
+# See https://github.com/TheLartians/CPM.cmake for usage and update instructions.
 #
 # MIT License
 # ----------- 
@@ -28,11 +28,11 @@
 
 cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
 
-set(CURRENT_CPM_VERSION 0.21)
+set(CURRENT_CPM_VERSION 0.26.2)
 
 if(CPM_DIRECTORY)
-  if(NOT ${CPM_DIRECTORY} MATCHES ${CMAKE_CURRENT_LIST_DIR})
+  if(NOT CPM_DIRECTORY STREQUAL CMAKE_CURRENT_LIST_DIR)
-    if (${CPM_VERSION} VERSION_LESS ${CURRENT_CPM_VERSION})
+    if (CPM_VERSION VERSION_LESS CURRENT_CPM_VERSION)
       message(AUTHOR_WARNING "${CPM_INDENT} \
 A dependency is using a more recent CPM version (${CURRENT_CPM_VERSION}) than the current project (${CPM_VERSION}). \
 It is recommended to upgrade CPM to the most recent version. \
@@ -54,6 +54,8 @@ option(CPM_USE_LOCAL_PACKAGES "Always try to use `find_package` to get dependenc
 option(CPM_LOCAL_PACKAGES_ONLY "Only use `find_package` to get dependencies" $ENV{CPM_LOCAL_PACKAGES_ONLY})
 option(CPM_DOWNLOAD_ALL "Always download dependencies from source" $ENV{CPM_DOWNLOAD_ALL})
 option(CPM_DONT_UPDATE_MODULE_PATH "Don't update the module path to allow using find_package" $ENV{CPM_DONT_UPDATE_MODULE_PATH})
+option(CPM_DONT_CREATE_PACKAGE_LOCK "Don't create a package lock file in the binary path" $ENV{CPM_DONT_CREATE_PACKAGE_LOCK})
+option(CPM_INCLUDE_ALL_IN_PACKAGE_LOCK "Add all packages added through CPM.cmake to the package lock" $ENV{CPM_INCLUDE_ALL_IN_PACKAGE_LOCK})
 
 set(CPM_VERSION ${CURRENT_CPM_VERSION} CACHE INTERNAL "")
 set(CPM_DIRECTORY ${CMAKE_CURRENT_LIST_DIR} CACHE INTERNAL "")
@@ -78,6 +80,11 @@ if (NOT CPM_DONT_UPDATE_MODULE_PATH)
   set(CMAKE_MODULE_PATH "${CPM_MODULE_PATH};${CMAKE_MODULE_PATH}")
 endif()
 
+if (NOT CPM_DONT_CREATE_PACKAGE_LOCK)
+  set(CPM_PACKAGE_LOCK_FILE "${CMAKE_BINARY_DIR}/cpm-package-lock.cmake" CACHE INTERNAL "")
+  file(WRITE ${CPM_PACKAGE_LOCK_FILE} "# CPM Package Lock\n# This file should be committed to version control\n\n")
+endif()
+
 include(FetchContent)
 include(CMakeParseArguments)
 
@@ -90,8 +97,8 @@ function(cpm_find_package NAME VERSION)
   string(REPLACE " " ";" EXTRA_ARGS "${ARGN}")
   find_package(${NAME} ${VERSION} ${EXTRA_ARGS} QUIET)
   if(${CPM_ARGS_NAME}_FOUND)
-    message(STATUS "${CPM_INDENT} using local package ${CPM_ARGS_NAME}@${${CPM_ARGS_NAME}_VERSION}")
+    message(STATUS "${CPM_INDENT} using local package ${CPM_ARGS_NAME}@${VERSION}")
-    CPMRegisterPackage(${CPM_ARGS_NAME} "${${CPM_ARGS_NAME}_VERSION}")
+    CPMRegisterPackage(${CPM_ARGS_NAME} "${VERSION}")
     set(CPM_PACKAGE_FOUND YES PARENT_SCOPE)
   else()
     set(CPM_PACKAGE_FOUND NO PARENT_SCOPE)
@@ -117,9 +124,21 @@ function(CPMFindPackage)
 
   cmake_parse_arguments(CPM_ARGS "" "${oneValueArgs}" "" ${ARGN})
 
+  if (NOT DEFINED CPM_ARGS_VERSION)
+    if (DEFINED CPM_ARGS_GIT_TAG) 
+      cpm_get_version_from_git_tag("${CPM_ARGS_GIT_TAG}" CPM_ARGS_VERSION)
+    endif()
+  endif()
+
   if (CPM_DOWNLOAD_ALL)
     CPMAddPackage(${ARGN})
-    cpm_export_variables()
+    cpm_export_variables(${CPM_ARGS_NAME})
+    return()
+  endif()
+
+  CPMCheckIfPackageAlreadyAdded(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}" "${CPM_ARGS_OPTIONS}")
+  if (CPM_PACKAGE_ALREADY_ADDED)
+    cpm_export_variables(${CPM_ARGS_NAME})
     return()
   endif()
 
@@ -127,21 +146,47 @@ function(CPMFindPackage)
 
   if(NOT CPM_PACKAGE_FOUND)
     CPMAddPackage(${ARGN})
-    cpm_export_variables()
+    cpm_export_variables(${CPM_ARGS_NAME})
   endif()
 
 endfunction()
 
+# checks if a package has been added before
+function(CPMCheckIfPackageAlreadyAdded CPM_ARGS_NAME CPM_ARGS_VERSION CPM_ARGS_OPTIONS)
+  if ("${CPM_ARGS_NAME}" IN_LIST CPM_PACKAGES)
+    CPMGetPackageVersion(${CPM_ARGS_NAME} CPM_PACKAGE_VERSION)
+    if("${CPM_PACKAGE_VERSION}" VERSION_LESS "${CPM_ARGS_VERSION}")
+      message(WARNING "${CPM_INDENT} requires a newer version of ${CPM_ARGS_NAME} (${CPM_ARGS_VERSION}) than currently included (${CPM_PACKAGE_VERSION}).")
+    endif()
+    if (CPM_ARGS_OPTIONS)
+      foreach(OPTION ${CPM_ARGS_OPTIONS})
+        cpm_parse_option(${OPTION})
+        if(NOT "${${OPTION_KEY}}" STREQUAL "${OPTION_VALUE}")
+          message(WARNING "${CPM_INDENT} ignoring package option for ${CPM_ARGS_NAME}: ${OPTION_KEY} = ${OPTION_VALUE} (${${OPTION_KEY}})")
+        endif()
+      endforeach()
+    endif()
+    cpm_get_fetch_properties(${CPM_ARGS_NAME})
+    SET(${CPM_ARGS_NAME}_ADDED NO)
+    SET(CPM_PACKAGE_ALREADY_ADDED YES PARENT_SCOPE)
+    cpm_export_variables(${CPM_ARGS_NAME})
+  else()
+    SET(CPM_PACKAGE_ALREADY_ADDED NO PARENT_SCOPE)
+  endif()
+endfunction()
+
 # Download and add a package from source
 function(CPMAddPackage)
 
   set(oneValueArgs
     NAME
+    FORCE
     VERSION
     GIT_TAG
     DOWNLOAD_ONLY
     GITHUB_REPOSITORY
     GITLAB_REPOSITORY
+    GIT_REPOSITORY
     SOURCE_DIR
     DOWNLOAD_COMMAND
     FIND_PACKAGE_ARGUMENTS
@@ -153,10 +198,75 @@ function(CPMAddPackage)
 
   cmake_parse_arguments(CPM_ARGS "" "${oneValueArgs}" "${multiValueArgs}" "${ARGN}")
 
+  # Set default values for arguments
+
+  if (NOT DEFINED CPM_ARGS_VERSION)
+    if (DEFINED CPM_ARGS_GIT_TAG) 
+      cpm_get_version_from_git_tag("${CPM_ARGS_GIT_TAG}" CPM_ARGS_VERSION)
+    endif()
+  endif()
+
+  if(CPM_ARGS_DOWNLOAD_ONLY)
+    set(DOWNLOAD_ONLY ${CPM_ARGS_DOWNLOAD_ONLY})
+  else()
+    set(DOWNLOAD_ONLY NO)
+  endif()
+
+  if (DEFINED CPM_ARGS_GITHUB_REPOSITORY)
+    set(CPM_ARGS_GIT_REPOSITORY "https://github.com/${CPM_ARGS_GITHUB_REPOSITORY}.git")
+  endif()
+
+  if (DEFINED CPM_ARGS_GITLAB_REPOSITORY)
+    list(CPM_ARGS_GIT_REPOSITORY "https://gitlab.com/${CPM_ARGS_GITLAB_REPOSITORY}.git")
+  endif()
+
+  if (DEFINED CPM_ARGS_GIT_REPOSITORY)
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS GIT_REPOSITORY ${CPM_ARGS_GIT_REPOSITORY})
+    if (NOT DEFINED CPM_ARGS_GIT_TAG)
+      set(CPM_ARGS_GIT_TAG v${CPM_ARGS_VERSION})
+    endif()
+  endif()
+
+  if (DEFINED CPM_ARGS_GIT_TAG)
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS GIT_TAG ${CPM_ARGS_GIT_TAG})
+  endif()
+
+  # Check if package has been added before
+  CPMCheckIfPackageAlreadyAdded(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}" "${CPM_ARGS_OPTIONS}")
+  if (CPM_PACKAGE_ALREADY_ADDED)
+    cpm_export_variables(${CPM_ARGS_NAME})
+    return()
+  endif()
+
+  # Check for manual overrides
+  if (NOT CPM_ARGS_FORCE AND NOT "${CPM_${CPM_ARGS_NAME}_SOURCE}" STREQUAL "")
+    set(PACKAGE_SOURCE ${CPM_${CPM_ARGS_NAME}_SOURCE})
+    set(CPM_${CPM_ARGS_NAME}_SOURCE "")
+    CPMAddPackage(
+      NAME ${CPM_ARGS_NAME}
+      SOURCE_DIR ${PACKAGE_SOURCE}
+      FORCE True
+    )
+    cpm_export_variables(${CPM_ARGS_NAME})
+    return()
+  endif()
+
+  # Check for available declaration
+  if (NOT CPM_ARGS_FORCE AND NOT "${CPM_DECLARATION_${CPM_ARGS_NAME}}" STREQUAL "")
+    set(declaration ${CPM_DECLARATION_${CPM_ARGS_NAME}})
+    set(CPM_DECLARATION_${CPM_ARGS_NAME} "")
+    CPMAddPackage(${declaration})
+    cpm_export_variables(${CPM_ARGS_NAME})
+    # checking again to ensure version and option compatibility
+    CPMCheckIfPackageAlreadyAdded(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}" "${CPM_ARGS_OPTIONS}")
+    return()
+  endif()
+
   if(CPM_USE_LOCAL_PACKAGES OR CPM_LOCAL_PACKAGES_ONLY)
     cpm_find_package(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}" ${CPM_ARGS_FIND_PACKAGE_ARGUMENTS})
 
     if(CPM_PACKAGE_FOUND)
+      cpm_export_variables(${CPM_ARGS_NAME})
       return()
     endif()
 
@@ -165,58 +275,7 @@ function(CPMAddPackage)
     endif()
   endif()
 
-  if (NOT DEFINED CPM_ARGS_VERSION)
+  CPMRegisterPackage("${CPM_ARGS_NAME}" "${CPM_ARGS_VERSION}")
-    if (DEFINED CPM_ARGS_GIT_TAG) 
-      cpm_get_version_from_git_tag("${CPM_ARGS_GIT_TAG}" CPM_ARGS_VERSION)
-    endif()
-    if (NOT DEFINED CPM_ARGS_VERSION) 
-      set(CPM_ARGS_VERSION 0)
-    endif()
-  endif()
-
-  if (NOT DEFINED CPM_ARGS_GIT_TAG)
-    set(CPM_ARGS_GIT_TAG v${CPM_ARGS_VERSION})
-  endif()
-
-  list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS GIT_TAG ${CPM_ARGS_GIT_TAG})
-
-  if(CPM_ARGS_DOWNLOAD_ONLY)
-    set(DOWNLOAD_ONLY ${CPM_ARGS_DOWNLOAD_ONLY})
-  else()
-    set(DOWNLOAD_ONLY NO)
-  endif()
-
-  if (CPM_ARGS_GITHUB_REPOSITORY)
-    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS GIT_REPOSITORY "https://github.com/${CPM_ARGS_GITHUB_REPOSITORY}.git")
-  endif()
-
-  if (CPM_ARGS_GITLAB_REPOSITORY)
-    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS GIT_REPOSITORY "https://gitlab.com/${CPM_ARGS_GITLAB_REPOSITORY}.git")
-  endif()
-
-  if ("${CPM_ARGS_NAME}" IN_LIST CPM_PACKAGES)
-    CPMGetPackageVersion(${CPM_ARGS_NAME} CPM_PACKAGE_VERSION)
-    if(${CPM_PACKAGE_VERSION} VERSION_LESS ${CPM_ARGS_VERSION})
-      message(WARNING "${CPM_INDENT} requires a newer version of ${CPM_ARGS_NAME} (${CPM_ARGS_VERSION}) than currently included (${CPM_PACKAGE_VERSION}).")
-    endif()
-    if (CPM_ARGS_OPTIONS)
-      foreach(OPTION ${CPM_ARGS_OPTIONS})
-        cpm_parse_option(${OPTION})
-        if(NOT "${${OPTION_KEY}}" STREQUAL ${OPTION_VALUE})
-          message(WARNING "${CPM_INDENT} ignoring package option for ${CPM_ARGS_NAME}: ${OPTION_KEY} = ${OPTION_VALUE} (${${OPTION_KEY}})")
-        endif()
-      endforeach()
-    endif()
-    cpm_fetch_package(${CPM_ARGS_NAME} ${DOWNLOAD_ONLY})
-    cpm_get_fetch_properties(${CPM_ARGS_NAME})
-    SET(${CPM_ARGS_NAME}_SOURCE_DIR "${${CPM_ARGS_NAME}_SOURCE_DIR}")
-    SET(${CPM_ARGS_NAME}_BINARY_DIR "${${CPM_ARGS_NAME}_BINARY_DIR}")  
-    SET(${CPM_ARGS_NAME}_ADDED NO)
-    cpm_export_variables()
-    return()
-  endif()
-
-  CPMRegisterPackage(${CPM_ARGS_NAME} ${CPM_ARGS_VERSION})
 
   if (CPM_ARGS_OPTIONS)
     foreach(OPTION ${CPM_ARGS_OPTIONS})
@@ -225,28 +284,28 @@ function(CPMAddPackage)
     endforeach()
   endif()
 
-  set(FETCH_CONTENT_DECLARE_EXTRA_OPTS "")
-
   if (DEFINED CPM_ARGS_GIT_TAG)
     set(PACKAGE_INFO "${CPM_ARGS_GIT_TAG}")
+  elseif (DEFINED CPM_ARGS_SOURCE_DIR)
+    set(PACKAGE_INFO "${CPM_ARGS_SOURCE_DIR}")
   else()
     set(PACKAGE_INFO "${CPM_ARGS_VERSION}")
   endif()
 
   if (DEFINED CPM_ARGS_DOWNLOAD_COMMAND)
-    set(FETCH_CONTENT_DECLARE_EXTRA_OPTS DOWNLOAD_COMMAND ${CPM_ARGS_DOWNLOAD_COMMAND})
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS DOWNLOAD_COMMAND ${CPM_ARGS_DOWNLOAD_COMMAND})
-  elseif(DEFINED CPM_ARGS_SOURCE_DIR)
+  elseif (DEFINED CPM_ARGS_SOURCE_DIR)
-    set(FETCH_CONTENT_DECLARE_EXTRA_OPTS SOURCE_DIR ${CPM_ARGS_SOURCE_DIR})
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS SOURCE_DIR ${CPM_ARGS_SOURCE_DIR})
   elseif (CPM_SOURCE_CACHE)
     string(TOLOWER ${CPM_ARGS_NAME} lower_case_name)
     set(origin_parameters ${CPM_ARGS_UNPARSED_ARGUMENTS})
     list(SORT origin_parameters)
     string(SHA1 origin_hash "${origin_parameters}")
     set(download_directory ${CPM_SOURCE_CACHE}/${lower_case_name}/${origin_hash})
-    list(APPEND FETCH_CONTENT_DECLARE_EXTRA_OPTS SOURCE_DIR ${download_directory})
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS SOURCE_DIR ${download_directory})
     if (EXISTS ${download_directory})
       # disable the download command to allow offline builds
-      list(APPEND FETCH_CONTENT_DECLARE_EXTRA_OPTS DOWNLOAD_COMMAND "${CMAKE_COMMAND}")
+      list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS DOWNLOAD_COMMAND "${CMAKE_COMMAND}")
       set(PACKAGE_INFO "${download_directory}")
     else()
       # remove timestamps so CMake will re-download the dependency
@@ -255,23 +314,82 @@ function(CPMAddPackage)
     endif()
   endif()
 
-  cpm_declare_fetch(${CPM_ARGS_NAME} ${CPM_ARGS_VERSION} ${PACKAGE_INFO} "${CPM_ARGS_UNPARSED_ARGUMENTS}" ${FETCH_CONTENT_DECLARE_EXTRA_OPTS})
-  cpm_fetch_package(${CPM_ARGS_NAME} ${DOWNLOAD_ONLY})
-  cpm_get_fetch_properties(${CPM_ARGS_NAME})
   CPMCreateModuleFile(${CPM_ARGS_NAME} "CPMAddPackage(${ARGN})")
+
+  if (CPM_PACKAGE_LOCK_ENABLED)
+    if ((CPM_ARGS_VERSION AND NOT CPM_ARGS_SOURCE_DIR) OR CPM_INCLUDE_ALL_IN_PACKAGE_LOCK)
+      cpm_add_to_package_lock(${CPM_ARGS_NAME} "${ARGN}")
+    elseif(CPM_ARGS_SOURCE_DIR)
+      cpm_add_comment_to_package_lock(${CPM_ARGS_NAME} "local directory")
+    else()
+      cpm_add_comment_to_package_lock(${CPM_ARGS_NAME} "${ARGN}")
+    endif()
+  endif()
+
+  cpm_declare_fetch("${CPM_ARGS_NAME}" "${CPM_ARGS_VERSION}" "${PACKAGE_INFO}" "${CPM_ARGS_UNPARSED_ARGUMENTS}")
+  cpm_fetch_package("${CPM_ARGS_NAME}" "${DOWNLOAD_ONLY}")
+  cpm_get_fetch_properties("${CPM_ARGS_NAME}")
+
   SET(${CPM_ARGS_NAME}_ADDED YES)
-  cpm_export_variables()
+  cpm_export_variables("${CPM_ARGS_NAME}")
 endfunction()
 
+# Fetch a previously declared package
+macro(CPMGetPackage Name)
+  if (DEFINED "CPM_DECLARATION_${Name}")
+    CPMAddPackage(
+      NAME ${Name}
+    )
+  else()
+    message(SEND_ERROR "Cannot retrieve package ${Name}: no declaration available")
+  endif()
+endmacro()
+
 # export variables available to the caller to the parent scope
 # expects ${CPM_ARGS_NAME} to be set
-macro(cpm_export_variables)
+macro(cpm_export_variables name)
-  SET(${CPM_ARGS_NAME}_SOURCE_DIR "${${CPM_ARGS_NAME}_SOURCE_DIR}" PARENT_SCOPE)
+  SET(${name}_SOURCE_DIR "${${name}_SOURCE_DIR}" PARENT_SCOPE)
-  SET(${CPM_ARGS_NAME}_BINARY_DIR "${${CPM_ARGS_NAME}_BINARY_DIR}" PARENT_SCOPE)
+  SET(${name}_BINARY_DIR "${${name}_BINARY_DIR}" PARENT_SCOPE)
-  SET(${CPM_ARGS_NAME}_ADDED "${${CPM_ARGS_NAME}_ADDED}" PARENT_SCOPE)
+  SET(${name}_ADDED "${${name}_ADDED}" PARENT_SCOPE)
 endmacro()
 
-# declares that a package has been added to CPM
+# declares a package, so that any call to CPMAddPackage for the 
+# package name will use these arguments instead.
+# Previous declarations will not be overriden.
+macro(CPMDeclarePackage Name)
+  if (NOT DEFINED "CPM_DECLARATION_${Name}")
+    set("CPM_DECLARATION_${Name}" "${ARGN}")
+  endif()
+endmacro()
+
+function(cpm_add_to_package_lock Name)
+  if (NOT CPM_DONT_CREATE_PACKAGE_LOCK)
+    file(APPEND ${CPM_PACKAGE_LOCK_FILE} "# ${Name}\nCPMDeclarePackage(${Name} \"${ARGN}\")\n")
+  endif()
+endfunction()
+
+function(cpm_add_comment_to_package_lock Name)
+  if (NOT CPM_DONT_CREATE_PACKAGE_LOCK)
+    file(APPEND ${CPM_PACKAGE_LOCK_FILE} "# ${Name} (unversioned)\n# CPMDeclarePackage(${Name} \"${ARGN}\")\n")
+  endif()
+endfunction()
+
+# includes the package lock file if it exists and creates a target
+# `cpm-write-package-lock` to update it
+macro(CPMUsePackageLock file)
+  if (NOT CPM_DONT_CREATE_PACKAGE_LOCK)
+    get_filename_component(CPM_ABSOLUTE_PACKAGE_LOCK_PATH ${file} ABSOLUTE)
+    if(EXISTS ${CPM_ABSOLUTE_PACKAGE_LOCK_PATH})
+      include(${CPM_ABSOLUTE_PACKAGE_LOCK_PATH})
+    endif()
+    if (NOT TARGET cpm-update-package-lock)
+      add_custom_target(cpm-update-package-lock COMMAND ${CMAKE_COMMAND} -E copy ${CPM_PACKAGE_LOCK_FILE} ${CPM_ABSOLUTE_PACKAGE_LOCK_PATH})
+    endif()
+    set(CPM_PACKAGE_LOCK_ENABLED true)
+  endif()
+endmacro()
+
+# registers a package that has been added to CPM
 function(CPMRegisterPackage PACKAGE VERSION)
   list(APPEND CPM_PACKAGES ${PACKAGE})
   set(CPM_PACKAGES ${CPM_PACKAGES} CACHE INTERNAL "")
@@ -292,8 +410,7 @@ function (cpm_declare_fetch PACKAGE VERSION INFO)
     return()
   endif()
 
-  FetchContent_Declare(
+  FetchContent_Declare(${PACKAGE}
-    ${PACKAGE}
     ${ARGN}
   )
 endfunction()
@@ -311,22 +428,22 @@ endfunction()
 
 # downloads a previously declared package via FetchContent
 function (cpm_fetch_package PACKAGE DOWNLOAD_ONLY)  
-
   if (${CPM_DRY_RUN}) 
     message(STATUS "${CPM_INDENT} package ${PACKAGE} not fetched (dry run)")
     return()
   endif()
 
-  set(CPM_OLD_INDENT "${CPM_INDENT}")
+  if(DOWNLOAD_ONLY)
-  set(CPM_INDENT "${CPM_INDENT} ${PACKAGE}:")
+    FetchContent_GetProperties(${PACKAGE})
-  if(${DOWNLOAD_ONLY})
+    if(NOT ${PACKAGE}_POPULATED)
-    if(NOT "${PACKAGE}_POPULATED")
       FetchContent_Populate(${PACKAGE})
     endif()
   else()
+    set(CPM_OLD_INDENT "${CPM_INDENT}")
+    set(CPM_INDENT "${CPM_INDENT} ${PACKAGE}:")
     FetchContent_MakeAvailable(${PACKAGE})
+    set(CPM_INDENT "${CPM_OLD_INDENT}")
   endif()
-  set(CPM_INDENT "${CPM_OLD_INDENT}")
 endfunction()
 
 # splits a package option