From e737ace8fb7c039f276180e1190ef332e4d66705 Mon Sep 17 00:00:00 2001 From: RevoluPowered Date: Sat, 2 Nov 2019 14:21:21 +0000 Subject: [PATCH] Added compilation database support for clang and gcc This tool is originally from mongodb. - Updated CPPSUFFIXES to use scons suffixes - objective-c files will also be loaded into the compilation database where the compiler / tooling is available to compile the files. Known limitations: - this will not work with msvc as your compiler. --- .appveyor.yml | 4 +- SConstruct | 4 + site_scons/site_tools/compilation_db.py | 173 ++++++++++++++++++++++++ 3 files changed, 180 insertions(+), 1 deletion(-) create mode 100644 site_scons/site_tools/compilation_db.py diff --git a/.appveyor.yml b/.appveyor.yml index 05e7094981d..81a6276d9cf 100644 --- a/.appveyor.yml +++ b/.appveyor.yml @@ -20,7 +20,9 @@ cache: install: - SET "PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%" - - pip install scons==3.1.2 + - pip install -U wheel # needed for pip install scons to work, otherwise a flag is missing + - pip install scons # use stable scons + - if defined VS call "%VS%" %ARCH% # if defined - so we can also use mingw before_build: - echo %GD_PLATFORM% diff --git a/SConstruct b/SConstruct index a8a4acbcdbf..601c2b6b687 100644 --- a/SConstruct +++ b/SConstruct @@ -255,6 +255,10 @@ if selected_platform in platform_list: else: env = env_base.Clone() + env.Tool("compilation_db") + env.Alias("compiledb", env.CompilationDatabase('compile_commands.json')) + + if env['dev']: env['verbose'] = True env['warnings'] = "extra" diff --git a/site_scons/site_tools/compilation_db.py b/site_scons/site_tools/compilation_db.py new file mode 100644 index 00000000000..086484a153c --- /dev/null +++ b/site_scons/site_tools/compilation_db.py @@ -0,0 +1,173 @@ +# Copyright 2015 MongoDB Inc. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +import json +import SCons +import itertools + +# Implements the ability for SCons to emit a compilation database for the MongoDB project. See +# http://clang.llvm.org/docs/JSONCompilationDatabase.html for details on what a compilation +# database is, and why you might want one. The only user visible entry point here is +# 'env.CompilationDatabase'. This method takes an optional 'target' to name the file that +# should hold the compilation database, otherwise, the file defaults to compile_commands.json, +# which is the name that most clang tools search for by default. + +# TODO: Is there a better way to do this than this global? Right now this exists so that the +# emitter we add can record all of the things it emits, so that the scanner for the top level +# compilation database can access the complete list, and also so that the writer has easy +# access to write all of the files. But it seems clunky. How can the emitter and the scanner +# communicate more gracefully? +__COMPILATION_DB_ENTRIES = [] + +# We make no effort to avoid rebuilding the entries. Someday, perhaps we could and even +# integrate with the cache, but there doesn't seem to be much call for it. +class __CompilationDbNode(SCons.Node.Python.Value): + def __init__(self, value): + SCons.Node.Python.Value.__init__(self, value) + self.Decider(changed_since_last_build_node) + + +def changed_since_last_build_node(child, target, prev_ni, node): + """ Dummy decider to force always building""" + return True + + +def makeEmitCompilationDbEntry(comstr): + """ + Effectively this creates a lambda function to capture: + * command line + * source + * target + :param comstr: unevaluated command line + :return: an emitter which has captured the above + """ + user_action = SCons.Action.Action(comstr) + + def EmitCompilationDbEntry(target, source, env): + """ + This emitter will be added to each c/c++ object build to capture the info needed + for clang tools + :param target: target node(s) + :param source: source node(s) + :param env: Environment for use building this node + :return: target(s), source(s) + """ + + dbtarget = __CompilationDbNode(source) + + entry = env.__COMPILATIONDB_Entry( + target=dbtarget, source=[], __COMPILATIONDB_UTARGET=target, + __COMPILATIONDB_USOURCE=source, __COMPILATIONDB_UACTION=user_action, + __COMPILATIONDB_ENV=env) + + # TODO: Technically, these next two lines should not be required: it should be fine to + # cache the entries. However, they don't seem to update properly. Since they are quick + # to re-generate disable caching and sidestep this problem. + env.AlwaysBuild(entry) + env.NoCache(entry) + + __COMPILATION_DB_ENTRIES.append(dbtarget) + + return target, source + + return EmitCompilationDbEntry + + +def CompilationDbEntryAction(target, source, env, **kw): + """ + Create a dictionary with evaluated command line, target, source + and store that info as an attribute on the target + (Which has been stored in __COMPILATION_DB_ENTRIES array + :param target: target node(s) + :param source: source node(s) + :param env: Environment for use building this node + :param kw: + :return: None + """ + + command = env['__COMPILATIONDB_UACTION'].strfunction( + target=env['__COMPILATIONDB_UTARGET'], + source=env['__COMPILATIONDB_USOURCE'], + env=env['__COMPILATIONDB_ENV'], + ) + + entry = { + "directory": env.Dir('#').abspath, "command": command, + "file": str(env['__COMPILATIONDB_USOURCE'][0]) + } + + target[0].write(entry) + + +def WriteCompilationDb(target, source, env): + entries = [] + + for s in __COMPILATION_DB_ENTRIES: + entries.append(s.read()) + + with open(str(target[0]), 'w') as target_file: + json.dump(entries, target_file, sort_keys=True, indent=4, separators=(',', ': ')) + + +def ScanCompilationDb(node, env, path): + return __COMPILATION_DB_ENTRIES + + +def generate(env, **kwargs): + + static_obj, shared_obj = SCons.Tool.createObjBuilders(env) + + env['COMPILATIONDB_COMSTR'] = kwargs.get('COMPILATIONDB_COMSTR', + 'Building compilation database $TARGET') + + components_by_suffix = itertools.chain( + itertools.product(env['CPPSUFFIXES'], [ + (static_obj, SCons.Defaults.StaticObjectEmitter, '$CXXCOM'), + (shared_obj, SCons.Defaults.SharedObjectEmitter, '$SHCXXCOM'), + ]), + ) + + for entry in components_by_suffix: + suffix = entry[0] + builder, base_emitter, command = entry[1] + + # Ensure we have a valid entry + # used to auto ignore header files + if suffix in builder.emitter: + emitter = builder.emitter[suffix] + builder.emitter[suffix] = SCons.Builder.ListEmitter([ + emitter, + makeEmitCompilationDbEntry(command), + ]) + + env['BUILDERS']['__COMPILATIONDB_Entry'] = SCons.Builder.Builder( + action=SCons.Action.Action(CompilationDbEntryAction, None), ) + + env['BUILDERS']['__COMPILATIONDB_Database'] = SCons.Builder.Builder( + action=SCons.Action.Action(WriteCompilationDb, "$COMPILATIONDB_COMSTR"), + target_scanner=SCons.Scanner.Scanner(function=ScanCompilationDb, node_class=None)) + + def CompilationDatabase(env, target): + result = env.__COMPILATIONDB_Database(target=target, source=[]) + + env.AlwaysBuild(result) + env.NoCache(result) + + return result + + env.AddMethod(CompilationDatabase, 'CompilationDatabase') + + +def exists(env): + return True