Can set per-target cs args.

build.py

@@ -251,6 +251,10 @@ class BuildTarget():
         if not isinstance(cpplist, list):
             cpplist = [cpplist]
         self.add_compiler_args('cpp', cpplist)
+        cslist = kwargs.get('cs_args', [])
+        if not isinstance(cslist, list):
+            cslist = [cslist]
+        self.add_compiler_args('cs', cslist)
         self.link_args = kwargs.get('link_args', [])
         if not isinstance(self.link_args, list):
             self.link_args = [self.link_args]

ninjabackend.py

@@ -442,7 +442,7 @@ class NinjaBackend(backends.Backend):
         compiler = self.get_compiler_for_source(src_list[0])
         assert(compiler.get_language() == 'cs')
         rel_srcs = [os.path.join(self.build_to_src, s) for s in src_list]
-        commands = []
+        commands = target.extra_args.get('cs', [])
         commands += compiler.get_buildtype_args(buildtype)
         if isinstance(target, build.Executable):
             commands.append('-target:exe')