Reduce the size of a release test_shell from 18mb to 13mb.

build/SConscript.main

 # 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.
 
 import os
 import shutil
 import sys
 
 
 if sys.platform == 'win32':
@@ skipping 434 matching lines @@
 excluded_warnings = [
   # TODO: Clean up uses of ext/hash_map and remove this.
   # (see unordered_map and base/hash_tables.h)
   '-Wno-deprecated',  # Needed for using ext/hash_map on GCC 4.3
 ]
 linux_env.Append(
     BUILD_SCONSCRIPTS = [
         '$LIBEVENT_DIR/libevent.scons',
     ],
     CCFLAGS = ['-m32', '-pthread', '-march=i686', '-fno-exceptions'],
+    # GCC will generate ident directives with the GCC version. Accumulate
+    # these all up and you end up with ~80K repeated in a .comment section.
+    CCFLAGS_OPTIMIZED = ['-fno-ident'],
     CXXFLAGS = ['-Wall', '-Werror', '-march=i686'] + excluded_warnings,
     LINKFLAGS = ['-m32', '-pthread'],
 )
 
 linux_env.Replace(
     # Linking of large files uses lots of RAM, so serialize links
     # using the handy flock command from util-linux.
     LINK = 'flock $TARGET_ROOT/linker.lock ' + linux_env['LINK'],
 
     # We have several cases where archives depend on each other in a cyclic
@@ skipping 48 matching lines @@
 if ARGUMENTS.get('COVERAGE') == '1':
   linux_env.Append(CCFLAGS=['-fprofile-arcs', '-ftest-coverage'])
   linux_env.Append(LINKFLAGS=['-fprofile-arcs'])
 
 # Build with support for gprof when PROFILE=1.
 if ARGUMENTS.get('PROFILE') == '1':
   linux_env.Append(CCFLAGS=['-pg', '-g'])
   linux_env.Append(LINKFLAGS=['-pg'])
 
 # Build with symbols (useful for opt builds, for example) when SYMBOLS=1.
+# Otherwise if we're building release, strip all symbols from our output.
 if ARGUMENTS.get('SYMBOLS') == '1':
   linux_env.Append(CCFLAGS=['-g'])
+else:
+  linux_env.Append(CCFLAGS_OPTIMIZED=['-ffunction-sections', '-fdata-sections'])
+  linux_env.Append(LINKFLAGS_OPTIMIZED=['-Wl,--gc-sections', '-s'])

[Lei Zhang, 2009/01/26 22:21:23]

FYI, gold does not support --gc-sections.

 
 # Build shared libraries (useful for fast links) when SHARED=1.
 if ARGUMENTS.get('SHARED') == '1':
   linux_env.Replace(COMPONENT_STATIC=False)
 
 # Build with system-provided NSS and GTK.
 if root_env['PLATFORM'] in ['linux', 'linux2', 'posix']:
   try:
     linux_env.ParseConfig('pkg-config --cflags --libs nss')
     linux_env.ParseConfig('pkg-config --cflags --libs gtk+-2.0')
@@ skipping 281 matching lines @@
         'all_libraries',
         'all_languages',
         'all_programs',
         'all_test_programs',
     ], projects = [p],
     COMPONENT_VS_PROJECT_SCRIPT_PATH=(
         'cd $$(ProjectDir)/$VS_PROJECT_TO_MAIN_DIR && hammer.bat'),
 )
 
 # -------------------------------------------------------------------------