CMake: Implement configure -optimize-debug

Task-number: QTBUG-85373
Change-Id: I3aba1fcf96e36544dd75a5e6adc5f770a9a45726
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

CMakeLists.txt

@@ -118,6 +118,9 @@ endif()
 
 qt_build_repo_end()
 
+# This function must be called after the QT_FEATURE_xxx variables have been set up.
+qt_internal_set_up_config_optimizations_like_in_qmake()
+
 if(NOT QT_BUILD_STANDALONE_TESTS AND BUILD_EXAMPLES)
     add_subdirectory(examples)
     if(QT_NO_MAKE_EXAMPLES)

cmake/QtBuildInternals/QtBuildInternalsConfig.cmake

@@ -180,7 +180,9 @@ macro(qt_enable_cmake_languages)
         endif()
     endforeach()
 
-    qt_internal_set_up_config_optimizations_like_in_qmake()
+    if(NOT PROJECT_NAME STREQUAL "QtBase")
+        qt_internal_set_up_config_optimizations_like_in_qmake()
+    endif()
 endmacro()
 
 # Minimum setup required to have any CMakeList.txt build as as a standalone

cmake/QtFlagHandlingHelpers.cmake

@@ -356,6 +356,11 @@ function(qt_internal_set_up_config_optimizations_like_in_qmake)
                 endif()
             endif()
 
+            # Debug should get the OPTIMIZE_DEBUG flag if the respective feature is ON.
+            if(config STREQUAL "DEBUG" AND QT_FEATURE_optimize_debug)
+                string(APPEND "${flag_var_name}" " ${QT_CFLAGS_OPTIMIZE_DEBUG}")
+            endif()
+
             # Assign value to the cache entry.
             get_property(help_text CACHE "${flag_var_name}" PROPERTY HELPSTRING)
             set("${flag_var_name}" "${${flag_var_name}}" CACHE STRING "${help_text}" FORCE)

configure.cmake

@@ -409,6 +409,12 @@ qt_feature("use_lld_linker"
     DISABLE INPUT_linker STREQUAL 'bfd' OR INPUT_linker STREQUAL 'gold'
 )
 qt_feature_config("use_lld_linker" QMAKE_PRIVATE_CONFIG)
+qt_feature("optimize_debug"
+    LABEL "Optimize debug build"
+    AUTODETECT NOT QT_FEATURE_developer_build
+    CONDITION NOT MSVC AND NOT CLANG AND ( QT_FEATURE_debug OR QT_FEATURE_debug_and_release ) AND TEST_optimize_debug
+)
+qt_feature_config("optimize_debug" QMAKE_PRIVATE_CONFIG)
 qt_feature("pkg-config" PUBLIC
     LABEL "Using pkg-config"
     AUTODETECT NOT APPLE AND NOT WIN32

util/cmake/configurejson2cmake.py

@@ -897,7 +897,6 @@ def get_feature_mapping():
         "incredibuild_xge": None,
         "ltcg": {"autoDetect": "1", "condition": "CMAKE_INTERPROCEDURAL_OPTIMIZATION"},
         "msvc_mp": None,
-        "optimize_debug": None,
         "optimize_size": None,
         "simulator_and_device": {"condition": "UIKIT AND NOT QT_UIKIT_SDK"},
         "pkg-config": {"condition": "PKG_CONFIG_FOUND"},