Rust buildtype flags.

environment.py

@@ -57,6 +57,11 @@ msvc_buildtype_linker_flags = {'plain' : [],
                                'debugoptimized' : [],
                                'release' : []}
 
+rust_buildtype_flags = {'plain' : [],
+                        'debug' : ['-g'],
+                        'debugoptimized' : ['-g', '--opt-level', '2'],
+                        'release' : ['--opt-level', '3']}
+
 class CCompiler():
     def __init__(self, exelist, version, is_cross, exe_wrapper=None):
         if type(exelist) == type(''):
@@ -631,6 +636,9 @@ class RustCompiler():
     def get_dependency_gen_flags(self, outfile):
         return ['--dep-info', outfile]
 
+    def get_buildtype_flags(self, buildtype):
+        return rust_buildtype_flags[buildtype]
+
 class VisualStudioCCompiler(CCompiler):
     std_warn_flags = ['/W3']
     std_opt_flags= ['/O2']

ninjabackend.py

@@ -508,6 +508,7 @@ class NinjaBackend(backends.Backend):
             flags.append('bin')
         else:
             raise InvalidArguments('Unknown target type for rustc.')
+        flags += rustc.get_buildtype_flags(self.environment.coredata.buildtype)
         flags += ['--out-dir', target.subdir, '-o', target.get_basename()]
         element = NinjaBuildElement(target_name, 'rust_COMPILER', relsrc)
         element.add_item('FLAGS', flags)