From 20b1a5ccfe7acee8f286cbc01566399f1908a177 Mon Sep 17 00:00:00 2001
From: Matthias Braun <30432154+braunms@users.noreply.github.com>
Date: Wed, 3 Dec 2025 18:35:58 +0100
Subject: [PATCH] Make the profile editor (launcher GUI) and thus the Qt6
 dependency optional (#3857)

---
 apps/OpenSpace/CMakeLists.txt | 32 ++++++++++++++++++--------------
 apps/OpenSpace/main.cpp       |  6 ++++++
 2 files changed, 24 insertions(+), 14 deletions(-)

diff --git a/apps/OpenSpace/CMakeLists.txt b/apps/OpenSpace/CMakeLists.txt
index d6f99b9c5e..03100a7f16 100644
--- a/apps/OpenSpace/CMakeLists.txt
+++ b/apps/OpenSpace/CMakeLists.txt
@@ -143,23 +143,27 @@ add_custom_command(TARGET OpenSpace POST_BUILD
 
 end_header("Dependency: SGCT")
 
-begin_header("Dependency: Profile Editor")
-add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/ext/launcher)
-target_link_libraries(OpenSpace PRIVATE openspace-ui-launcher)
-end_header("Dependency: Profile Editor")
+# Profile Editor / Launcher GUI
+option(OPENSPACE_APPLICATION_OPENSPACE-LAUNCHER "Build Launcher GUI" ON)
+if (OPENSPACE_APPLICATION_OPENSPACE-LAUNCHER)
+  begin_header("Dependency: Profile Editor")
+  add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/ext/launcher)
+  target_link_libraries(OpenSpace PRIVATE openspace-ui-launcher)
+  target_compile_definitions(OpenSpace PRIVATE OPENSPACE_HAS_LAUNCHER)
+  end_header("Dependency: Profile Editor")
 
-if (WIN32)
-  # Find the windeployqt application
-  get_target_property(_qmake_executable Qt6::qmake IMPORTED_LOCATION)
-  get_filename_component(_qt_bin_dir "${_qmake_executable}" DIRECTORY)
-  add_custom_command(
-    TARGET OpenSpace POST_BUILD
-    COMMAND "${WINDEPLOYQT_EXECUTABLE}" --verbose 0 --no-compiler-runtime --no-translations \"$<TARGET_FILE:OpenSpace>\"
-    COMMENT "Deploying Qt libraries"
-  )
+  if (WIN32)
+    # Find the windeployqt application
+    get_target_property(_qmake_executable Qt6::qmake IMPORTED_LOCATION)
+    get_filename_component(_qt_bin_dir "${_qmake_executable}" DIRECTORY)
+    add_custom_command(
+      TARGET OpenSpace POST_BUILD
+      COMMAND "${WINDEPLOYQT_EXECUTABLE}" --verbose 0 --no-compiler-runtime --no-translations \"$<TARGET_FILE:OpenSpace>\"
+      COMMENT "Deploying Qt libraries"
+    )
+  endif ()
 endif ()
 
-
 # Web Browser and Web gui
 # Why not put these in the module's path? Because they do not have access to the
 # target as of July 2017, which is needed.
diff --git a/apps/OpenSpace/main.cpp b/apps/OpenSpace/main.cpp
index 40daa211bf..969b90fc53 100644
--- a/apps/OpenSpace/main.cpp
+++ b/apps/OpenSpace/main.cpp
@@ -79,9 +79,11 @@
 #include <float.h>
 #endif // OPENSPACE_BREAK_ON_FLOATING_POINT_EXCEPTION
 
+#ifdef OPENSPACE_HAS_LAUNCHER
 #include <launcherwindow.h>
 #include <QApplication>
 #include <QMessageBox>
+#endif // OPENSPACE_HAS_LAUNCHER
 
 #ifdef WIN32
 extern "C" {
@@ -1450,6 +1452,7 @@ int main(int argc, char* argv[]) {
 #endif // __APPLE__
 
     if (!global::configuration->bypassLauncher) {
+#ifdef OPENSPACE_HAS_LAUNCHER
 #ifndef __APPLE__
         int qac = 0;
         QApplication app(qac, nullptr);
@@ -1542,6 +1545,9 @@ int main(int argc, char* argv[]) {
             }
             global::configuration->windowConfiguration = config;
         }
+#else // ^^^^ OPENSPACE_HAS_LAUNCHER // !OPENSPACE_HAS_LAUNCHER
+        glfwInit();
+#endif // OPENSPACE_HAS_LAUNCHER
     }
     else {
         glfwInit();