CMake GUI: Split up into libraries, add test shim

Source/QtDialog/CMakeGUIExec.cxx

@@ -0,0 +1,15 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+
+#include <QApplication>
+
+class CMakeSetupDialog;
+
+void SetupDefaultQSettings()
+{
+}
+
+int CMakeGUIExec(CMakeSetupDialog* /*window*/)
+{
+  return QApplication::exec();
+}

Source/QtDialog/CMakeLists.txt

@@ -81,7 +81,6 @@ endif()
 set(SRCS
   AddCacheEntry.cxx
   AddCacheEntry.h
-  CMakeSetup.cxx
   CMakeSetupDialog.cxx
   CMakeSetupDialog.h
   Compilers.h
@@ -150,11 +149,18 @@ endif()
 
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
-add_executable(cmake-gui WIN32 MACOSX_BUNDLE ${SRCS} ${MANIFEST_FILE})
-target_link_libraries(cmake-gui CMakeLib Qt5::Core Qt5::Widgets ${CMake_QT_EXTRA_LIBRARIES})
+add_library(CMakeGUILib STATIC ${SRCS})
+# CMake_QT_EXTRA_LIBRARIES have to come before the main libraries on the link line
+target_link_libraries(CMakeGUILib PUBLIC CMakeLib ${CMake_QT_EXTRA_LIBRARIES} Qt5::Core Qt5::Widgets)
+
+add_library(CMakeGUIMainLib STATIC CMakeSetup.cxx)
+target_link_libraries(CMakeGUIMainLib PUBLIC CMakeGUILib)
+
+add_executable(cmake-gui WIN32 MACOSX_BUNDLE CMakeGUIExec.cxx ${MANIFEST_FILE})
+target_link_libraries(cmake-gui CMakeGUIMainLib Qt5::Core)
 
 if(WIN32)
-  target_sources(cmake-gui PRIVATE $<TARGET_OBJECTS:CMakeVersion>)
+  target_sources(CMakeGUILib INTERFACE $<TARGET_OBJECTS:CMakeVersion>)
 endif()
 
 if(CMake_JOB_POOL_LINK_BIN)
@@ -163,7 +169,7 @@ endif()
 
 # cmake-gui has not been updated for `include-what-you-use`.
 # Block the tool until this is done.
-set_target_properties(cmake-gui PROPERTIES
+set_target_properties(CMakeGUILib CMakeGUIMainLib cmake-gui PROPERTIES
   CXX_INCLUDE_WHAT_YOU_USE ""
   )
 

Source/QtDialog/CMakeSetup.cxx

@@ -21,7 +21,6 @@
 #include "cmDocumentationEntry.h"
 #include "cmStringAlgorithms.h"
 #include "cmSystemTools.h" // IWYU pragma: keep
-#include "cmVersion.h"
 #include "cmake.h"
 
 static const char* cmDocumentationName[][2] = { { nullptr,
@@ -55,6 +54,9 @@ Q_IMPORT_PLUGIN(QWindowsVistaStylePlugin);
 #  endif
 #endif
 
+int CMakeGUIExec(CMakeSetupDialog* window);
+void SetupDefaultQSettings();
+
 int main(int argc, char** argv)
 {
   cmSystemTools::EnsureStdPipes();
@@ -108,6 +110,7 @@ int main(int argc, char** argv)
   QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 #endif
 
+  SetupDefaultQSettings();
   QApplication app(argc, argv);
 
   setlocale(LC_NUMERIC, "C");
@@ -215,7 +218,7 @@ int main(int argc, char** argv)
     }
   }
 
-  return QApplication::exec();
+  return CMakeGUIExec(&dialog);
 }
 
 #if defined(Q_OS_MAC)