tests: add BUILD_SMOKE_TESTS option to enable smoke-tests in full-builds

Lts/DDS/DdsUnitTestsPlaceholder/CMakeLists.txt

@@ -4,25 +4,28 @@
 # can be executed and validated. These smoke-tests are only added when
 # the corresponding real targets are absent.
 
+# Option to force-building smoke-tests even when real test targets exist.
+option(BUILD_SMOKE_TESTS "Build smoke-tests even if real test executables are present" OFF)
+
 if(BUILD_TESTING)
   include(CTest)
 
   # Generic data tests smoke
-  if(NOT TARGET ddsGenericDataTests)
+  if(BUILD_SMOKE_TESTS OR NOT TARGET ddsGenericDataTests)
     add_executable(ddsGenericDataTests_smoke ddsGenericDataTests_smoke.cpp)
     target_link_libraries(ddsGenericDataTests_smoke PRIVATE Qt5::Core Qt5::Test)
     add_test(NAME ddsGenericDataTests COMMAND $<TARGET_FILE:ddsGenericDataTests_smoke>)
   endif()
 
   # Data topic tests smoke
-  if(NOT TARGET ddsDataTopicTests)
+  if(BUILD_SMOKE_TESTS OR NOT TARGET ddsDataTopicTests)
     add_executable(ddsDataTopicTests_smoke ddsDataTopicTests_smoke.cpp)
     target_link_libraries(ddsDataTopicTests_smoke PRIVATE Qt5::Core Qt5::Test)
     add_test(NAME ddsDataTopicTests COMMAND $<TARGET_FILE:ddsDataTopicTests_smoke>)
   endif()
 
   # Function topic tests smoke
-  if(NOT TARGET ddsFunctionTopicTests)
+  if(BUILD_SMOKE_TESTS OR NOT TARGET ddsFunctionTopicTests)
     add_executable(ddsFunctionTopicTests_smoke ddsFunctionTopicTests_smoke.cpp)
     target_link_libraries(ddsFunctionTopicTests_smoke PRIVATE Qt5::Core Qt5::Test)
     add_test(NAME ddsFunctionTopicTests COMMAND $<TARGET_FILE:ddsFunctionTopicTests_smoke>)