From c8062a424495617d0c5e6debe0fb243c438b9998 Mon Sep 17 00:00:00 2001
From: Alexey Edelev <alexey.edelev@qt.io>
Date: Fri, 22 Sep 2023 12:50:30 +0200
Subject: [PATCH] Add QtSortModuleDependencies.cmake

The script produces the list of Qt submodules that are required to
build the submodules listed in the QT_BUILD_SUBMODULES variable.
Also the script supports the "collect all but skip repos" mode.
The repos that needs to be skipped should be specified by setting
BUILD_<repo>=FALSE.
The resulting list preserves the required build order.

Change-Id: Ia1cfe0ce013f80dc2793a0ba863a18789657e5a1
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Reviewed-by: Amir Masoud Abdol <amir.abdol@qt.io>
---
 cmake/QtSortModuleDependencies.cmake | 13 ++++++++++
 cmake/QtTopLevelHelpers.cmake        | 38 ++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 cmake/QtSortModuleDependencies.cmake

diff --git a/cmake/QtSortModuleDependencies.cmake b/cmake/QtSortModuleDependencies.cmake
new file mode 100644
index 00000000..d27f1818
--- /dev/null
+++ b/cmake/QtSortModuleDependencies.cmake
@@ -0,0 +1,13 @@
+# The script produces the list of qt submodules that are required to build the submodules listed
+# in the QT_BUILD_SUBMODULES variable. The resulting list preserves the required build order.
+# Usage:
+# cmake [-DQT_BUILD_SUBMODULES="<repo;..>"] [-BUILD_<repo>=<TRUE|FALSE>] \
+#    -P <path/to>/qt6/cmake/QtSortModuleDependencies.cmake
+cmake_minimum_required(VERSION 3.16)
+
+include(${CMAKE_CURRENT_LIST_DIR}/QtTopLevelHelpers.cmake)
+
+qt_internal_collect_modules_only(result "${QT_BUILD_SUBMODULES}")
+
+list(JOIN result " " result)
+message("${result}")
diff --git a/cmake/QtTopLevelHelpers.cmake b/cmake/QtTopLevelHelpers.cmake
index abce0eeb..f8473d72 100644
--- a/cmake/QtTopLevelHelpers.cmake
+++ b/cmake/QtTopLevelHelpers.cmake
@@ -505,3 +505,41 @@ function(qt_internal_foreach_repo_run)
     )
     message("Successes: ${count_success}")
 endfunction()
+
+# The function collects repos and dependencies that are required to build
+# repos listed in ARGN. If the BUILD_<repo> is defined the 'repo' will be
+# excluded from the list.
+function(qt_internal_collect_modules_only out_repos)
+    set(initial_modules "${ARGN}")
+    get_filename_component(qt5_repo_dir "${CMAKE_CURRENT_LIST_DIR}/.." ABSOLUTE)
+
+    # Overriding CMAKE_CURRENT_SOURCE_DIR is ugly but works
+    set(CMAKE_CURRENT_SOURCE_DIR "${qt5_repo_dir}")
+    if(NOT initial_modules)
+        qt_internal_find_modules(initial_modules)
+    endif()
+
+    qt_internal_sort_module_dependencies("${initial_modules}" ${out_repos})
+    foreach(module IN LISTS ${out_repos})
+        # Check for unmet dependencies
+        if(DEFINED BUILD_${module} AND NOT BUILD_${module})
+            list(REMOVE_ITEM ${out_repos} ${module})
+            continue()
+        endif()
+        get_property(required_deps GLOBAL PROPERTY QT_REQUIRED_DEPS_FOR_${module})
+        get_property(dependencies GLOBAL PROPERTY QT_DEPS_FOR_${module})
+        foreach(dep IN LISTS dependencies)
+            set(required FALSE)
+            if(dep IN_LIST required_deps)
+                set(required TRUE)
+            endif()
+            if(required AND DEFINED BUILD_${dep} AND NOT BUILD_${dep})
+                set(BUILD_${module} FALSE)
+                list(REMOVE_ITEM ${out_repos} ${module})
+                break()
+            endif()
+        endforeach()
+    endforeach()
+
+    set(${out_repos} "${${out_repos}}" PARENT_SCOPE)
+endfunction()