Add suport for ASM for the IBM XL compiler

Alex

Modules/CMakeDetermineASMCompiler.cmake

@@ -99,6 +99,10 @@ IF(NOT CMAKE_ASM${ASM_DIALECT}_COMPILER_ID)
   SET(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_FLAGS_SunPro "-V")
   SET(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_REGEX_SunPro "Sun C")
 
+  LIST(APPEND CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDORS XL )
+  SET(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_FLAGS_XL "-qversion")
+  SET(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_REGEX_XL "XL C")
+
   LIST(APPEND CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDORS TI_DSP )
   SET(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_FLAGS_TI_DSP "-h")
   SET(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_REGEX_TI_DSP "Texas Instruments")

Modules/Compiler/XL-ASM.cmake

@@ -0,0 +1,15 @@
+SET(CMAKE_ASM_VERBOSE_FLAG "-V")
+
+# -qthreaded     = Ensures that all optimizations will be thread-safe
+# -qalias=noansi = Turns off type-based aliasing completely (safer optimizer)
+# -qhalt=e       = Halt on error messages (rather than just severe errors)
+SET(CMAKE_ASM_FLAGS_INIT "-qthreaded -qalias=noansi -qhalt=e -qsourcetype=assembler")
+
+SET(CMAKE_ASM_FLAGS_DEBUG_INIT "-g")
+SET(CMAKE_ASM_FLAGS_RELEASE_INIT "-O -DNDEBUG")
+SET(CMAKE_ASM_FLAGS_MINSIZEREL_INIT "-O -DNDEBUG")
+SET(CMAKE_ASM_FLAGS_RELWITHDEBINFO_INIT "-g")
+
+SET(CMAKE_ASM_SOURCE_FILE_EXTENSIONS s )
+
+SET(CMAKE_ASM_COMPILE_OBJECT "<CMAKE_ASM_COMPILER> <DEFINES> <FLAGS> -o <OBJECT>   -c <SOURCE>")