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author | David Robillard <d@drobilla.net> | 2018-09-15 14:51:02 +0200 |
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committer | David Robillard <d@drobilla.net> | 2018-09-15 14:51:02 +0200 |
commit | ffb5286641dca2e12bebd2c4a4f4a73cc11a20e6 (patch) | |
tree | 4d5eee9bf36eb3a34080a7b928333939327a5a96 /waflib/extras/pch.py | |
parent | bd57bc1edb6d8131a920bcc4f12d91457e2ca2ed (diff) | |
parent | 8c96b17a5393bffee0c521c4872a9fa999048032 (diff) | |
download | lilv-ffb5286641dca2e12bebd2c4a4f4a73cc11a20e6.tar.gz lilv-ffb5286641dca2e12bebd2c4a4f4a73cc11a20e6.tar.bz2 lilv-ffb5286641dca2e12bebd2c4a4f4a73cc11a20e6.zip |
Merge commit '8c96b17a5393bffee0c521c4872a9fa999048032' as 'waflib'
Diffstat (limited to 'waflib/extras/pch.py')
-rw-r--r-- | waflib/extras/pch.py | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/waflib/extras/pch.py b/waflib/extras/pch.py new file mode 100644 index 0000000..103e752 --- /dev/null +++ b/waflib/extras/pch.py @@ -0,0 +1,148 @@ +#! /usr/bin/env python +# encoding: utf-8 +# Alexander Afanasyev (UCLA), 2014 + +""" +Enable precompiled C++ header support (currently only clang++ and g++ are supported) + +To use this tool, wscript should look like: + + def options(opt): + opt.load('pch') + # This will add `--with-pch` configure option. + # Unless --with-pch during configure stage specified, the precompiled header support is disabled + + def configure(conf): + conf.load('pch') + # this will set conf.env.WITH_PCH if --with-pch is specified and the supported compiler is used + # Unless conf.env.WITH_PCH is set, the precompiled header support is disabled + + def build(bld): + bld(features='cxx pch', + target='precompiled-headers', + name='precompiled-headers', + headers='a.h b.h c.h', # headers to pre-compile into `precompiled-headers` + + # Other parameters to compile precompiled headers + # includes=..., + # export_includes=..., + # use=..., + # ... + + # Exported parameters will be propagated even if precompiled headers are disabled + ) + + bld( + target='test', + features='cxx cxxprogram', + source='a.cpp b.cpp d.cpp main.cpp', + use='precompiled-headers', + ) + + # or + + bld( + target='test', + features='pch cxx cxxprogram', + source='a.cpp b.cpp d.cpp main.cpp', + headers='a.h b.h c.h', + ) + +Note that precompiled header must have multiple inclusion guards. If the guards are missing, any benefit of precompiled header will be voided and compilation may fail in some cases. +""" + +import os +from waflib import Task, TaskGen, Utils +from waflib.Tools import c_preproc, cxx + + +PCH_COMPILER_OPTIONS = { + 'clang++': [['-include'], '.pch', ['-x', 'c++-header']], + 'g++': [['-include'], '.gch', ['-x', 'c++-header']], +} + + +def options(opt): + opt.add_option('--without-pch', action='store_false', default=True, dest='with_pch', help='''Try to use precompiled header to speed up compilation (only g++ and clang++)''') + +def configure(conf): + if (conf.options.with_pch and conf.env['COMPILER_CXX'] in PCH_COMPILER_OPTIONS.keys()): + conf.env.WITH_PCH = True + flags = PCH_COMPILER_OPTIONS[conf.env['COMPILER_CXX']] + conf.env.CXXPCH_F = flags[0] + conf.env.CXXPCH_EXT = flags[1] + conf.env.CXXPCH_FLAGS = flags[2] + + +@TaskGen.feature('pch') +@TaskGen.before('process_source') +def apply_pch(self): + if not self.env.WITH_PCH: + return + + if getattr(self.bld, 'pch_tasks', None) is None: + self.bld.pch_tasks = {} + + if getattr(self, 'headers', None) is None: + return + + self.headers = self.to_nodes(self.headers) + + if getattr(self, 'name', None): + try: + task = self.bld.pch_tasks["%s.%s" % (self.name, self.idx)] + self.bld.fatal("Duplicated 'pch' task with name %r" % "%s.%s" % (self.name, self.idx)) + except KeyError: + pass + + out = '%s.%d%s' % (self.target, self.idx, self.env['CXXPCH_EXT']) + out = self.path.find_or_declare(out) + task = self.create_task('gchx', self.headers, out) + + # target should be an absolute path of `out`, but without precompiled header extension + task.target = out.abspath()[:-len(out.suffix())] + + self.pch_task = task + if getattr(self, 'name', None): + self.bld.pch_tasks["%s.%s" % (self.name, self.idx)] = task + +@TaskGen.feature('cxx') +@TaskGen.after_method('process_source', 'propagate_uselib_vars') +def add_pch(self): + if not (self.env['WITH_PCH'] and getattr(self, 'use', None) and getattr(self, 'compiled_tasks', None) and getattr(self.bld, 'pch_tasks', None)): + return + + pch = None + # find pch task, if any + + if getattr(self, 'pch_task', None): + pch = self.pch_task + else: + for use in Utils.to_list(self.use): + try: + pch = self.bld.pch_tasks[use] + except KeyError: + pass + + if pch: + for x in self.compiled_tasks: + x.env.append_value('CXXFLAGS', self.env['CXXPCH_F'] + [pch.target]) + +class gchx(Task.Task): + run_str = '${CXX} ${ARCH_ST:ARCH} ${CXXFLAGS} ${CXXPCH_FLAGS} ${FRAMEWORKPATH_ST:FRAMEWORKPATH} ${CPPPATH_ST:INCPATHS} ${DEFINES_ST:DEFINES} ${CXXPCH_F:SRC} ${CXX_SRC_F}${SRC[0].abspath()} ${CXX_TGT_F}${TGT[0].abspath()} ${CPPFLAGS}' + scan = c_preproc.scan + color = 'BLUE' + ext_out=['.h'] + + def runnable_status(self): + try: + node_deps = self.generator.bld.node_deps[self.uid()] + except KeyError: + node_deps = [] + ret = Task.Task.runnable_status(self) + if ret == Task.SKIP_ME and self.env.CXX_NAME == 'clang': + t = os.stat(self.outputs[0].abspath()).st_mtime + for n in self.inputs + node_deps: + if os.stat(n.abspath()).st_mtime > t: + return Task.RUN_ME + return ret |