Created
October 28, 2011 00:28
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Precompiled header builder for SCons
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# | |
# SCons builder for gcc's precompiled headers | |
# Copyright (C) 2006 Tim Blechmann (C) 2011 Pedro Larroy | |
# | |
# This program is free software; you can redistribute it and/or modify | |
# it under the terms of the GNU General Public License as published by | |
# the Free Software Foundation; either version 2 of the License, or | |
# (at your option) any later version. | |
# | |
# This program is distributed in the hope that it will be useful, | |
# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
# GNU General Public License for more details. | |
# | |
# You should have received a copy of the GNU General Public License | |
# along with this program; see the file COPYING. If not, write to | |
# the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
# Boston, MA 02111-1307, USA. | |
# 1.2 | |
# | |
# 09-11-2011 Pedro Larroy: Fixed dependency emitter not working with variant dir | |
# 07-09-2012 Pedro Larroy: Create the resulting pch on the variant directory, | |
# the variant dir should be added to the includes, before any of the other | |
# local includes for the compiler to search the pch file on the build directory | |
# that we just created. In doubt execute 'strace -f g++ ...' to check that it | |
# opens the correct pch. | |
# | |
# FIXME: the original precompiled header has to be set | |
# in the environment as | |
# env['precompiled_header'], this should be fixed | |
# | |
# | |
# Example usage: | |
# src_variant_dir = 'build/release' | |
# includes = [ | |
# Dir(src_variant_dir), | |
# ... other includes ... | |
# ] | |
# ... set includes in environment ... | |
# env['precompiled_header'] = File('src/common/includes/all.h') | |
# env['Gch'] = env.Gch(target='common/includes/all.h.gch', source=env['precompiled_header']) | |
import SCons.Action | |
import SCons.Builder | |
import SCons.Scanner.C | |
import SCons.Util | |
import SCons.Script | |
import os | |
import functools | |
SCons.Script.EnsureSConsVersion(0,96,92) | |
GchAction = SCons.Action.Action('$GCHCOM', '$GCHCOMSTR') | |
GchShAction = SCons.Action.Action('$GCHSHCOM', '$GCHSHCOMSTR') | |
def gen_suffix(env, sources): | |
return sources[0].get_suffix() + env['GCHSUFFIX'] | |
GchShBuilder = SCons.Builder.Builder(action = GchShAction, | |
source_scanner = SCons.Scanner.C.CScanner(), | |
suffix = gen_suffix) | |
GchBuilder = SCons.Builder.Builder(action = GchAction, | |
source_scanner = SCons.Scanner.C.CScanner(), | |
suffix = gen_suffix) | |
def header_path(node): | |
h_path = node.abspath | |
idx = h_path.rfind('.gch') | |
if idx != -1: | |
h_path = h_path[0:idx] | |
if not os.path.isfile(h_path): | |
raise SCons.Errors.StopError("can't find header file: {0}".format(h_path)) | |
return h_path | |
else: | |
raise SCons.Errors.StopError("{0} file doesn't have .gch extension".format(h_path)) | |
def pch_emitter(pch_env_key, target, source, env): | |
# print 'target', target[0].str_for_display(), 'source', str(source[0]) | |
# print 'target' | |
# print map(lambda x: x.str_for_display(), target) | |
# print 'source' | |
# print map(lambda x: x.str_for_display(), source) | |
# print 'env:' | |
# print env.get(pch_env_key) | |
# print type(env.get(pch_env_key)) | |
SCons.Defaults.StaticObjectEmitter( target, source, env ) | |
scanner = SCons.Scanner.C.CScanner() | |
path = scanner.path(env) | |
deps = scanner(source[0], env, path) | |
if env.get(pch_env_key): | |
h_path = env['precompiled_header'].abspath | |
#print 'h_path', h_path | |
#print env['Gch'].abspath | |
#print map(lambda x: x.str_for_display(), deps) | |
#if h_path in [x.abspath for x in deps]: | |
for i in [x.abspath for x in deps]: | |
#print '|{0}|{1}|'.format(i, h_path) | |
if i == h_path: | |
if 'explain' in env.GetOption('debug'): | |
print 'Found dep. on pch: ', source[0], ' -> ', env[pch_env_key] | |
env.Depends(target, env[pch_env_key]) | |
return (target, source) | |
def generate(env): | |
""" | |
Add builders and construction variables for the Gch builder. | |
""" | |
env.Append(BUILDERS = { | |
'gch': env.Builder( | |
action = GchAction, | |
suffix = 'gch', | |
target_factory = env.fs.File, | |
), | |
'gchsh': env.Builder( | |
action = GchShAction, | |
target_factory = env.fs.File, | |
), | |
}) | |
try: | |
bld = env['BUILDERS']['Gch'] | |
bldsh = env['BUILDERS']['GchSh'] | |
except KeyError: | |
bld = GchBuilder | |
bldsh = GchShBuilder | |
env['BUILDERS']['Gch'] = bld | |
env['BUILDERS']['GchSh'] = bldsh | |
env['GCHCOM'] = '$CXX -Wall -o $TARGET -x c++-header -c $CXXFLAGS $CCFLAGS $_CCCOMCOM $SOURCE' | |
env['GCHSHCOM'] = '$CXX -o $TARGET -x c++-header -c $SHCXXFLAGS $CCFLAGS $_CCCOMCOM $SOURCE' | |
env['GCHSUFFIX'] = '.gch' | |
for suffix in SCons.Util.Split('.c .C .cc .cxx .cpp .c++'): | |
static_pch_emitter = functools.partial(pch_emitter, 'Gch') | |
env['BUILDERS']['StaticObject'].add_emitter( suffix, static_pch_emitter ) | |
shared_pch_emitter = functools.partial(pch_emitter, 'GchSh') | |
env['BUILDERS']['SharedObject'].add_emitter( suffix, shared_pch_emitter ) | |
def exists(env): | |
return env.Detect('g++') |
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