Expose present get_compile_options API in Toolcahins

tools/export/exporters.py

@@ -105,7 +105,10 @@ class Exporter(object):
         config_header = self.toolchain.get_config_header()
         flags = {key + "_flags": copy.deepcopy(value) for key, value
                  in self.toolchain.flags.iteritems()}
-        asm_defines = ["-D" + symbol for symbol in self.toolchain.get_symbols(True)]
+        asm_defines = self.toolchain.get_compile_options(
+            self.toolchain.get_symbols(for_asm=True),
+            filter(None, self.resources.inc_dirs),
+            for_asm=True)
         c_defines = ["-D" + symbol for symbol in self.toolchain.get_symbols()]
         flags['asm_flags'] += asm_defines
         flags['c_flags'] += c_defines

tools/toolchains/__init__.py

@@ -1356,6 +1356,25 @@ class mbedToolchain:
         """
         raise NotImplemented
 
+    @abstractmethod
+    def get_compile_options(self, defines, includes, for_asm=False):
+        """Generate the compiler options from the defines and includes
+
+        Positional arguments:
+        defines -- The preprocessor macros defined on the command line
+        includes -- The include file search paths
+
+        Keyword arguments:
+        for_asm -- generate the assembler options instead of the compiler options
+
+        Return value:
+        A list of the command line arguments that will force the inclusion the specified header
+
+        Side effects:
+        None
+        """
+        raise NotImplemented
+
     @abstractmethod
     def assemble(self, source, object, includes):
         """Generate the command line that assembles.