Refactored dep file name so Swift dependency tracking works.

compilers.py

@@ -215,6 +215,9 @@ class CCompiler(Compiler):
     def get_dependency_gen_args(self, outtarget, outfile):
         return ['-MMD', '-MQ', outtarget, '-MF', outfile]
 
+    def depfile_for_object(self, objfile):
+        return objfile + '.' + self.get_depfile_suffix()
+
     def get_depfile_suffix(self):
         return 'd'
 
@@ -985,6 +988,9 @@ class SwiftCompiler(Compiler):
     def get_dependency_gen_args(self, outtarget, outfile):
         return ['-emit-dependencies']
 
+    def depfile_for_object(self, objfile):
+        return os.path.splitext(objfile)[0] + '.' + self.get_depfile_suffix()
+
     def get_depfile_suffix(self):
         return 'd'
 
@@ -1562,6 +1568,9 @@ end program prog
     def get_module_outdir_args(self, path):
         return ['-J' + path]
 
+    def depfile_for_object(self, objfile):
+        return objfile + '.' + self.get_depfile_suffix()
+
     def get_depfile_suffix(self):
         return 'd'
 

ninjabackend.py

@@ -1269,7 +1269,7 @@ rule FORTRAN_DEP_HACK
         obj_basename = src_filename.replace('/', '_').replace('\\', '_')
         rel_obj = os.path.join(self.get_target_private_dir(target), obj_basename)
         rel_obj += '.' + self.environment.get_object_suffix()
-        dep_file = rel_obj + '.' + compiler.get_depfile_suffix()
+        dep_file = compiler.depfile_for_object(rel_obj)
         if self.environment.coredata.get_builtin_option('use_pch'):
             pchlist = target.get_pch(compiler.language)
         else: