Fix DDR debug generation for Open XL on z/OS

Adds the `gdwarf-5` and `gsplit-dwarf` flags to enable split dwarf
(dwo) files to be generated with Open XL on z/OS. By default the debug
information is included in the `.o` files, which doesn't work with our
ddrgen logic for z/OS.

Also fixes existing code to allow all the debug information to be
generated when working with split dwarf (dwo) files.

Signed-off-by: Gaurav Chaudhari <[email protected]>

Author: Deigue

runtime/cmake/platform/toolcfg/openxl.cmake

@@ -27,6 +27,10 @@ list(APPEND OMR_PLATFORM_COMPILE_OPTIONS
 
 list(APPEND OMR_PLATFORM_CXX_COMPILE_OPTIONS -fno-rtti)
 
+if(OMR_OS_ZOS)
+	list(APPEND OMR_PLATFORM_COMPILE_OPTIONS -g -gdwarf-5 -gsplit-dwarf)
+endif()
+
 # OMR_PLATFORM_CXX_COMPILE_OPTIONS get applied to JIT code (which needs exceptions),
 # so we put these in the CMAKE_CXX_FLAGS instead.
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fignore-exceptions")

runtime/ddr/CMakeLists.txt

@@ -61,7 +61,7 @@ if(CMAKE_C_COMPILER_ID STREQUAL "XLClang")
 	if(CMAKE_C_COMPILER_VERSION AND (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL "17.1"))
 		target_compile_options(j9ddr_misc PRIVATE -qdbxextra)
 	endif()
-elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
+elseif((CMAKE_C_COMPILER_ID MATCHES "Clang") OR (OMR_TOOLCONFIG STREQUAL "openxl"))
 	target_compile_options(j9ddr_misc PRIVATE -fno-eliminate-unused-debug-types)
 elseif(CMAKE_C_COMPILER_ID STREQUAL "GNU")
 	target_compile_options(j9ddr_misc PRIVATE -femit-class-debug-always)

runtime/ddr/gcddr.cpp

@@ -71,6 +71,7 @@ GC_DdrDebugLink(MM_MemoryPoolSplitAddressOrderedList)
 GC_DdrDebugLink(MM_RealtimeMarkingScheme)
 GC_DdrDebugLink(MM_ScavengerForwardedHeader)
 GC_DdrDebugLink(MM_StringTable)
+GC_DdrDebugLink(MM_SublistPuddle)
 
 #if defined(J9VM_GC_FINALIZATION)
 GC_DdrDebugLink(GC_FinalizeListManager)