FeatureSummary.cmake: update documentation

Alex

Modules/FeatureSummary.cmake

@@ -1,18 +1,22 @@
 # - Macros for generating a summary of enabled/disabled features
 #
-# This module provides the macros feature_summary(), set_package_info() and
+# This module provides the macros feature_summary(), set_package_properties() and
 # add_feature_info().
-# For compatiblity it also still provides set_feature_info(),
+# For compatiblity it also still provides set_package_info(), set_feature_info(),
-# print_enabled_features() and print_disabled_features.
+# print_enabled_features() and print_disabled_features().
 #
 # These macros can be used to generate a summary of enabled and disabled
 # packages and/or feature for a build tree:
 #
-#    -- Enabled features:
+#    -- The following OPTIONAL packages have been found:
 #    LibXml2 (required version >= 2.4) , XML processing library. , <http://xmlsoft.org>
+#       * Enables HTML-import in MyWordProcessor
+#       * Enables odt-export in MyWordProcessor
 #    PNG , A PNG image library. , <http://www.libpng.org/pub/png/>
-#    -- Disabled features:
+#       * Enables saving screenshots
+#    -- The following OPTIONAL packages have not been found:
 #    Lua51 , The Lua scripting language. , <http://www.lua.org>
+#       * Enables macros in MyWordProcessor
 #    Foo , Foo provides cool stuff.
 #
 #
@@ -20,24 +24,34 @@
 #                     [APPEND]
 #                     [VAR <variable_name>]
 #                     [INCLUDE_QUIET_PACKAGES]
+#                     [FATAL_ON_MISSING_REQUIRED_PACKAGES]
 #                     [DESCRIPTION "Found packages:"]
 #                     WHAT (ALL | PACKAGES_FOUND | PACKAGES_NOT_FOUND
 #                          | ENABLED_FEATURES | DISABLED_FEATURES]
 #                   )
 #
 # The FEATURE_SUMMARY() macro can be used to print information about enabled
-# or disabled features or packages of a project.
+# or disabled packages or features of a project.
 # By default, only the names of the features/packages will be printed and their
-# required version when one was specified. Use SET_FEATURE_INFO() to add more
+# required version when one was specified. Use SET_PACKAGE_PROPERTIES() to add more
-# useful information, like e.g. a download URL for the respective package.
+# useful information, like e.g. a download URL for the respective package or their
+# purpose in the project.
 #
 # The WHAT option is the only mandatory option. Here you specify what information
 # will be printed:
+#    ALL: print everything
 #    ENABLED_FEATURES: the list of all features which are enabled
 #    DISABLED_FEATURES: the list of all features which are disabled
 #    PACKAGES_FOUND: the list of all packages which have been found
 #    PACKAGES_NOT_FOUND: the list of all packages which have not been found
-#    ALL: this will give all packages which have or have not been found
+#    OPTIONAL_PACKAGES_FOUND: only those packages which have been found which have the type OPTIONAL
+#    OPTIONAL_PACKAGES_NOT_FOUND: only those packages which have not been found which have the type OPTIONAL
+#    RECOMMENDED_PACKAGES_FOUND: only those packages which have been found which have the type RECOMMENDED
+#    RECOMMENDED_PACKAGES_NOT_FOUND: only those packages which have not been found which have the type RECOMMENDED
+#    REQUIRED_PACKAGES_FOUND: only those packages which have been found which have the type REQUIRED
+#    REQUIRED_PACKAGES_NOT_FOUND: only those packages which have not been found which have the type REQUIRED
+#    RUNTIME_PACKAGES_FOUND: only those packages which have been found which have the type RUNTIME
+#    RUNTIME_PACKAGES_NOT_FOUND: only those packages which have not been found which have the type RUNTIME
 #
 # If a FILENAME is given, the information is printed into this file. If APPEND
 # is used, it is appended to this file, otherwise the file is overwritten if
@@ -47,19 +61,29 @@
 # If FILENAME is not used, the information is printed to the terminal.
 # Using the DESCRIPTION option a description or headline can be set which will
 # be printed above the actual content.
+# If INCLUDE_QUIET_PACKAGES is given, packages which have been searched with find_package(... QUIET) will
+# also be listed. By default they are skipped.
+# If FATAL_ON_MISSING_REQUIRED_PACKAGES is given, CMake will abort if a package which is marked as REQUIRED
+# has not been found.
 #
 # Example 1, append everything to a file:
 #   feature_summary(WHAT ALL
 #                   FILENAME ${CMAKE_BINARY_DIR}/all.log APPEND)
 #
-# Example 2, print the enabled features into the variable enabledFeaturesText:
+# Example 2, print the enabled features into the variable enabledFeaturesText, including QUIET packages:
 #   feature_summary(WHAT ENABLED_FEATURES
+#                   INCLUDE_QUIET_PACKAGES
 #                   DESCRIPTION "Enabled Features:"
 #                   VAR enabledFeaturesText)
 #   message(STATUS "${enabledFeaturesText}")
 #
 #
-#    SET_PACKAGE_INFO(<name> <description> [<url> [<purpose>] ] )
+#    SET_PACKAGE_PROPERTIES(<name> PROPERTIES [ URL <url> ]
+#                                             [ DESCRIPTION <description> ]
+#                                             [ TYPE (RUNTIME|OPTIONAL|RECOMMENDED|REQUIRED) ]
+#                                             [ PURPOSE <purpose> ]
+#                          )
+#
 # Use this macro to set up information about the named package, which can
 # then be displayed via FEATURE_SUMMARY().
 # This can be done either directly in the Find-module or in the project
@@ -67,16 +91,47 @@
 # The features for which information can be set are added automatically by the
 # find_package() command.
 #
+# URL: this should be the homepage of the package, or something similar. Ideally this is set
+# already directly in the Find-module.
+#
+# DESCRIPTION: A short description what that package is, at most one sentence.
+# Ideally this is set already directly in the Find-module.
+#
+# TYPE: What type of dependency has the using project on that package. Default is OPTIONAL.
+# In this case it is a package which can be used by the project when available at buildtime,
+# but it also work without. RECOMMENDED is similar to OPTIONAL, i.e. the project will build
+# if the package is not present, but the functionality of the resulting binaries will be severly
+# limited. If a REQUIRED package is not available at buildtime, the project may not even build. This
+# can be combined with the FATAL_ON_MISSING_REQUIRED_PACKAGES argument for feature_summary().
+# Last, a RUNTIME package is a package which is actually not used at all during the build, but
+# which is required for actually running the resulting binaries. So if such a package is missing,
+# the project can still be built, but it may not work later on. If set_package_properties() is called
+# multiple times for the same package with different TYPEs, the TYPE is only changed to higher
+# TYPEs ( RUNTIME < OPTIONAL < RECOMMENDED < REQUIRED ), lower TYPEs are ignored.
+# The TYPE property is project-specific, so it cannot be set by the Find-module, but must be set in the project.
+#
+# PURPOSE: This describes which features this package enables in the project, i.e. it tells the user
+# what functionality he gets in the resulting binaries.
+# If set_package_properties() is called multiple times for a package, all PURPOSE properties are appended
+# to a list of purposes of the package in the project.
+# As the TYPE property, also the PURPOSE property
+# is project-specific, so it cannot be set by the Find-module, but must be set in the project.
+#
+#
 # Example for setting the info for a package:
 #   find_package(LibXml2)
-#   set_package_info(LibXml2 "XML processing library." "http://xmlsoft.org/")
+#   set_package_properties(LibXml2 PROPERTIES DESCRIPTION "A XML processing library."
+#                                             URL "http://xmlsoft.org/")
 #
-#    SET_PACKAGE_PROPERTIES(<name> PROPERTIES <description> [<url> [<purpose>  [<type>] ] ] )
+#   set_package_properties(LibXml2 PROPERTIES TYPE RECOMMENDED
+#                                             PURPOSE "Enables HTML-import in MyWordProcessor")
+# ...
+#   set_package_properties(LibXml2 PROPERTIES TYPE OPTIONAL
+#                                             PURPOSE "Enables odt-export in MyWordProcessor")
 #
-# URL: homepage of the package
+#   find_package(DBUS)
-# DESCRIPTION: short description of the package itself
+#   set_package_properties(LibXml2 PROPERTIES TYPE RUNTIME
-# PURPOSE: what is the purpopse of using the package in the current project, always appended
+#                                             PURPOSE "Necessary to disable the screensaver during a presentation" )
-# TYPE: OPTIONAL (default), RECOMMENDED, REQUIRED, RUNTIME
 #
 #    ADD_FEATURE_INFO(<name> <enabled> <description>)
 # Use this macro to add information about a feature with the given <name>.
@@ -92,6 +147,14 @@
 #
 # The following macros are provided for compatibility with previous CMake versions:
 #
+#    SET_PACKAGE_INFO(<name> <description> [<url> [<purpose>] ] )
+# Use this macro to set up information about the named package, which can
+# then be displayed via FEATURE_SUMMARY().
+# This can be done either directly in the Find-module or in the project
+# which uses the module after the FIND_PACKAGE() call.
+# The features for which information can be set are added automatically by the
+# find_package() command.
+#
 #    PRINT_ENABLED_FEATURES()
 # Does the same as FEATURE_SUMMARY(WHAT ENABLED_FEATURES  DESCRIPTION "Enabled features:")
 #
@@ -336,7 +399,7 @@ FUNCTION(FEATURE_SUMMARY)
       SET(_tmp)
       _FS_GET_FEATURE_SUMMARY( ${part} _tmp ${_FS_INCLUDE_QUIET_PACKAGES})
       IF(_tmp)
-        SET(_fullText "${_fullText}\n\n${title_${part}}\n${_tmp}")
+        SET(_fullText "${_fullText}\n\n-- ${title_${part}}\n${_tmp}")
         IF("${part}" STREQUAL "REQUIRED_PACKAGES_NOT_FOUND")
           SET(requiredPackagesNotFound TRUE)
         ENDIF()