Add OPT=1 flag to build optimized on Linux.

net/net_perftests.scons

 # Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 __doc__ = """
 Configuration for building the net_perftests{,.exe} executable.
 """
 
 Import('env')
 
@@ skipping 39 matching lines @@
           '/DELAYLOAD:"dwmapi.dll"',
           '/DELAYLOAD:"uxtheme.dll"',
           '/MACHINE:X86',
           '/FIXED:No',
           '/safeseh',
           '/dynamicbase',
           '/ignore:4199',
           '/nxcompat',
       ],
   )
+elif env['PLATFORM'] == 'posix':
+  env.Append(
+      # TODO(port): disk_cache_perftest breaks strict aliasing rules.
+      CCFLAGS = ['-fno-strict-aliasing'],
+  )
 
 input_files = [
     'base/cookie_monster_perftest.cc',
     'disk_cache/disk_cache_perftest.cc',
     'disk_cache/disk_cache_test_util$OBJSUFFIX',
 
     # TODO(sgk): avoid using .cc from base directly
     '$OBJ_ROOT/base/run_all_perftests$OBJSUFFIX',
     '$OBJ_ROOT/base/perftimer$OBJSUFFIX',
 ]
 
 if env['PLATFORM'] in ('posix', 'win32'):
 
   env.ChromeTestProgram('net_perftests', input_files)