cmake: xcc: fix compile warnings and errors

XCC does not support the "-undef" flag so set NOSYSDEF_CFLAGS to
empty string to fix compile warning.

Also, XCC does not supply the macro __SIZEOF_LONG__ which breaks
the build. So define it.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>

cmake/toolchain/xcc.cmake

@@ -15,4 +15,12 @@ set(OPTIMIZE_FOR_DEBUG_FLAG "-O0")
 set(CC xcc)
 set(C++ xc++)
 
+set(NOSYSDEF_CFLAG "")
+
 list(APPEND TOOLCHAIN_C_FLAGS -fms-extensions)
+
+# xcc doesn't have this, so we need to define it here.
+# This is the same as in the xcc toolchain spec files.
+list(APPEND TOOLCHAIN_C_FLAGS
+  -D__SIZEOF_LONG__=4
+  )

soc/xtensa/intel_s1000/soc.c

@@ -11,6 +11,8 @@
 #include <xtensa/hal.h>
 #include <init.h>
 
+#include "soc.h"
+
 #define LOG_LEVEL CONFIG_SOC_LOG_LEVEL
 #include <logging/log.h>
 LOG_MODULE_REGISTER(soc);