CMake: Allow excluding tools and apps from the default 'all' target

Qt uses the qtNomakeTools() function to mark a directory which will
not be built as part of the default target. This is especially
important when cross-compiling (to iOS for example) because the build
process might fail.

The condition for not building these "GUI tool sub-directory projects"
is the absence of the "tools" value in qmake's QT_BUILD_PARTS
variable.

Introduce a QT_NO_MAKE_TOOLS CMake variable. If the value is true,
it's equivalent to "tools" not being present in QT_BUILD_PARTS.

Introduce qt_exclude_tool_directories_from_default_target().
It's the qmake counter part to qtNomakeTools().

Teach pro2cmake to generate it where appropriate.

Change-Id: If2e5958d91847ab139af0e452608510286e73fa0
Reviewed-by: Leander Beernaert <leander.beernaert@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

1 files changed, 17 insertions, 0 deletions

diff --git a/util/cmake/pro2cmake.py b/util/cmake/pro2cmake.py
index d4bcf81063..e496a2448d 100755
--- a/util/cmake/pro2cmake.py
+++ b/util/cmake/pro2cmake.py
@@ -1064,6 +1064,13 @@ class Scope(object):
             if project_required_condition:
                 scope._append_operation("_REQUIREMENTS", AddOperation(project_required_condition))
 
+            qt_no_make_tools = statement.get("qt_no_make_tools_arguments")
+            if qt_no_make_tools:
+                qt_no_make_tools = qt_no_make_tools.strip("()").strip()
+                qt_no_make_tools = qt_no_make_tools.split()
+                for entry in qt_no_make_tools:
+                    scope._append_operation("_QT_NO_MAKE_TOOLS", AddOperation(entry))
+
         scope.settle_condition()
 
         if scope.scope_debug:
@@ -1783,6 +1790,16 @@ def handle_subdir(
     )
     group_and_print_sub_dirs(scope, indent=indent)
 
+    qt_no_make_tools = scope.get("_QT_NO_MAKE_TOOLS")
+    if qt_no_make_tools:
+        ind = spaces(indent + 1)
+        directories_string = ""
+        for directory in qt_no_make_tools:
+            directories_string += f"{ind}{directory}\n"
+        cm_fh.write(
+            f"\nqt_exclude_tool_directories_from_default_target(\n{directories_string})\n\n"
+        )
+
 
 def sort_sources(sources: List[str]) -> List[str]:
     to_sort = {}  # type: Dict[str, List[str]]