migration(grantlee): add patch script to avoid QT_TESTCASE_BUILDDIR redefinition; add Grantlee parser smoke test

Lts/Common/CodeGen/CMakeLists.txt

@@ -113,6 +113,21 @@ else()
   message(STATUS "Grantlee5 not found; skipping codegen_grantlee target")
 endif()
 
+# Smoke-test: parse all .grantlee templates in this directory to detect parse/render regressions
+if (TARGET Grantlee5::Templates)
+  find_package(Qt6 COMPONENTS Core QUIET)
+  if (Qt6_FOUND)
+    set(QTCORE_TARGET Qt6::Core)
+  else()
+    find_package(Qt5 COMPONENTS Core REQUIRED)
+    set(QTCORE_TARGET Qt5::Core)
+  endif()
+
+  add_executable(grantlee_parser_smoke tests/GrantleeParserSmoke.cpp)
+  target_link_libraries(grantlee_parser_smoke PRIVATE Grantlee5::Templates ${QTCORE_TARGET})
+  add_test(NAME GrantleeParserSmoke COMMAND grantlee_parser_smoke ${CMAKE_CURRENT_SOURCE_DIR})
+endif()
+
 NGL_ADD_EXECUTABLE(ALL codegen
   main_grantlee.cpp
 )