[orc-rt] Ensure EH/RTTI=On overrides LLVM opts, applies to unit tests.

When -DORC_RT_ENABLE_EXCEPTIONS=On and -DORC_RT_ENABLE_RTTI=On are passed we
need to ensure that the resulting compiler flags (e.g. -fexceptions, -frtti
for clang/GCC) are appended so that we override any inherited options (e.g.
-fno-exceptions, -fno-rtti) from LLVM.

Updates unit tests to ensure that these compiler options are applied to them
too.

Author: lhames

orc-rt/CMakeLists.txt

@@ -44,11 +44,15 @@ set(ORC_RT_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
 
 # Configure RTTI and exceptions compile flags
 set(ORC_RT_COMPILE_FLAGS)
-if(NOT ORC_RT_ENABLE_RTTI)
+if(ORC_RT_ENABLE_RTTI)
+  list(APPEND ORC_RT_COMPILE_FLAGS -frtti)
+else()
   list(APPEND ORC_RT_COMPILE_FLAGS -fno-rtti)
 endif()
 
-if(NOT ORC_RT_ENABLE_EXCEPTIONS)
+if(ORC_RT_ENABLE_EXCEPTIONS)
+  list(APPEND ORC_RT_COMPILE_FLAGS -fexceptions)
+else()
   list(APPEND ORC_RT_COMPILE_FLAGS -fno-exceptions)
 endif()
 

orc-rt/unittests/CMakeLists.txt

@@ -9,6 +9,9 @@ endif ()
 
 function(add_orc_rt_unittest test_dirname)
   add_unittest(OrcRTUnitTests ${test_dirname} ${ARGN})
+
+  # Apply ORC_RT_COMPILE_FLAGS to the unittest target
+  target_compile_options(${test_dirname} PRIVATE ${ORC_RT_COMPILE_FLAGS})
 endfunction()
 
 add_orc_rt_unittest(CoreTests