configure: Allow specifying a comma separated list to -skip option

This makes skipping a list of submodules more concise.

e.g. instead of passing

 -skip qtsvg -skip qtimageformats -skip qtmultimedia

pass

 -skip qtsvg,qtimageformats,qtmultimedia

Pick-to: 6.2 6.3
Change-Id: I6a48828b2fd7cec9f6e19988f7b4033333768abb
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>

cmake/QtProcessConfigureArgs.cmake

@@ -25,6 +25,15 @@ macro(pop_path_argument)
     file(TO_CMAKE_PATH "${path}" path)
 endmacro()
 
+function(is_non_empty_valid_arg arg value)
+    if(value STREQUAL "")
+        message(FATAL_ERROR "Value supplied to command line option '${arg}' is empty.")
+    elseif(value MATCHES "^-.*")
+        message(FATAL_ERROR
+                "Value supplied to command line option '${arg}' is invalid: ${value}")
+    endif()
+endfunction()
+
 if("${MODULE_ROOT}" STREQUAL "")
     # If MODULE_ROOT is not set, assume that we want to build qtbase or top-level.
     get_filename_component(MODULE_ROOT ".." ABSOLUTE BASE_DIR "${CMAKE_CURRENT_LIST_DIR}")
@@ -76,8 +85,12 @@ while(NOT "${configure_args}" STREQUAL "")
     elseif(arg STREQUAL "-write-options-for-conan")
         list(POP_FRONT configure_args options_json_file)
     elseif(arg STREQUAL "-skip")
-        list(POP_FRONT configure_args qtrepo)
-        push("-DBUILD_${qtrepo}=OFF")
+        list(POP_FRONT configure_args qtrepos)
+        is_non_empty_valid_arg("${arg}" "${qtrepos}")
+        list(TRANSFORM qtrepos REPLACE "," ";")
+        foreach(qtrepo IN LISTS qtrepos)
+            push("-DBUILD_${qtrepo}=OFF")
+        endforeach()
     elseif(arg STREQUAL "-qt-host-path")
         pop_path_argument()
         push("-DQT_HOST_PATH=${path}")

cmake/configure-cmake-mapping.md

@@ -95,7 +95,7 @@ The following table describes the mapping of configure options to CMake argument
 | -android-style-assets                 | -DFEATURE_android_style_assets=ON                 |                                                                 |
 | -android-javac-source                 | -DQT_ANDROID_JAVAC_SOURCE=7                       | Set the javac build source version.                             |
 | -android-javac-target                 | -DQT_ANDROID_JAVAC_TARGET=7                       | Set the javac build target version.                             |
-| -skip <repo>                          | -DBUILD_<repo>=OFF                                |                                                                 |
+| -skip <repo>,...,<repo_n>             | -DBUILD_<repo>=OFF                                |                                                                 |
 | -make <part>                          | -DQT_BUILD_TESTS=ON                               | A way to turn on tools explicitly is missing. If tests/examples |
 |                                       | -DQT_BUILD_EXAMPLES=ON                            | are enabled, you can disable their building as part of the      |
 |                                       |                                                   | 'all' target by also passing -DQT_BUILD_TESTS_BY_DEFAULT=OFF or |

config_help.txt

@@ -167,7 +167,9 @@ Build environment:
 
 Component selection:
 
-  -skip <repo> ......... Exclude an entire repository from the build.
+  -skip <repo>[,<repo>]  Exclude one or more entire repositories from the
+                         build. The list should be separated with commas.
+                         e.g. -skip qtimageformats,qtsvg
   -make <part> ......... Add <part> to the list of parts to be built.
                          Specifying this option clears the default list first.
                          (allowed values: libs, tools, examples, tests,