update to use scons compile db tool
(cherry picked from commit 974a4cde9d)
This commit is contained in:
Gordon MacPherson
Rémi Verschelde
parent
69dc9c9417
commit
5db6095bde
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@ -298,9 +298,10 @@ if selected_platform in platform_list:
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from SCons import __version__ as scons_raw_version
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scons_ver = env._get_major_minor_revision(scons_raw_version)
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if scons_ver >= (3, 1, 1):
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env.Tool("compilation_db", toolpath=["misc/scons"])
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env.Alias("compiledb", env.CompilationDatabase("compile_commands.json"))
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if scons_ver >= (4, 0, 0):
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env.Tool("compilation_db")
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env.Alias("compiledb", env.CompilationDatabase())
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if env["dev"]:
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env["verbose"] = True
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@ -1,177 +0,0 @@
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# Copyright 2015 MongoDB Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import json
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import SCons
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import itertools
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# Implements the ability for SCons to emit a compilation database for the MongoDB project. See
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# http://clang.llvm.org/docs/JSONCompilationDatabase.html for details on what a compilation
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# database is, and why you might want one. The only user visible entry point here is
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# 'env.CompilationDatabase'. This method takes an optional 'target' to name the file that
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# should hold the compilation database, otherwise, the file defaults to compile_commands.json,
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# which is the name that most clang tools search for by default.
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# TODO: Is there a better way to do this than this global? Right now this exists so that the
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# emitter we add can record all of the things it emits, so that the scanner for the top level
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# compilation database can access the complete list, and also so that the writer has easy
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# access to write all of the files. But it seems clunky. How can the emitter and the scanner
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# communicate more gracefully?
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__COMPILATION_DB_ENTRIES = []
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# We make no effort to avoid rebuilding the entries. Someday, perhaps we could and even
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# integrate with the cache, but there doesn't seem to be much call for it.
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class __CompilationDbNode(SCons.Node.Python.Value):
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def __init__(self, value):
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SCons.Node.Python.Value.__init__(self, value)
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self.Decider(changed_since_last_build_node)
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def changed_since_last_build_node(child, target, prev_ni, node):
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""" Dummy decider to force always building"""
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return True
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def makeEmitCompilationDbEntry(comstr):
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"""
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Effectively this creates a lambda function to capture:
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* command line
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* source
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* target
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:param comstr: unevaluated command line
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:return: an emitter which has captured the above
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"""
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user_action = SCons.Action.Action(comstr)
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def EmitCompilationDbEntry(target, source, env):
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"""
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This emitter will be added to each c/c++ object build to capture the info needed
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for clang tools
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:param target: target node(s)
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:param source: source node(s)
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:param env: Environment for use building this node
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:return: target(s), source(s)
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"""
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dbtarget = __CompilationDbNode(source)
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entry = env.__COMPILATIONDB_Entry(
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target=dbtarget,
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source=[],
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__COMPILATIONDB_UTARGET=target,
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__COMPILATIONDB_USOURCE=source,
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__COMPILATIONDB_UACTION=user_action,
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__COMPILATIONDB_ENV=env,
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)
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# TODO: Technically, these next two lines should not be required: it should be fine to
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# cache the entries. However, they don't seem to update properly. Since they are quick
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# to re-generate disable caching and sidestep this problem.
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env.AlwaysBuild(entry)
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env.NoCache(entry)
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__COMPILATION_DB_ENTRIES.append(dbtarget)
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return target, source
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return EmitCompilationDbEntry
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def CompilationDbEntryAction(target, source, env, **kw):
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"""
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Create a dictionary with evaluated command line, target, source
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and store that info as an attribute on the target
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(Which has been stored in __COMPILATION_DB_ENTRIES array
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:param target: target node(s)
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:param source: source node(s)
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:param env: Environment for use building this node
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:param kw:
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:return: None
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"""
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command = env["__COMPILATIONDB_UACTION"].strfunction(
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target=env["__COMPILATIONDB_UTARGET"], source=env["__COMPILATIONDB_USOURCE"], env=env["__COMPILATIONDB_ENV"],
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)
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entry = {
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"directory": env.Dir("#").abspath,
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"command": command,
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"file": str(env["__COMPILATIONDB_USOURCE"][0]),
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}
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target[0].write(entry)
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def WriteCompilationDb(target, source, env):
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entries = []
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for s in __COMPILATION_DB_ENTRIES:
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entries.append(s.read())
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with open(str(target[0]), "w") as target_file:
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json.dump(entries, target_file, sort_keys=True, indent=4, separators=(",", ": "))
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def ScanCompilationDb(node, env, path):
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return __COMPILATION_DB_ENTRIES
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def generate(env, **kwargs):
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static_obj, shared_obj = SCons.Tool.createObjBuilders(env)
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env["COMPILATIONDB_COMSTR"] = kwargs.get("COMPILATIONDB_COMSTR", "Building compilation database $TARGET")
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components_by_suffix = itertools.chain(
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itertools.product(
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env["CPPSUFFIXES"],
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[
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(static_obj, SCons.Defaults.StaticObjectEmitter, "$CXXCOM"),
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(shared_obj, SCons.Defaults.SharedObjectEmitter, "$SHCXXCOM"),
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],
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),
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)
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for entry in components_by_suffix:
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suffix = entry[0]
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builder, base_emitter, command = entry[1]
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# Ensure we have a valid entry
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# used to auto ignore header files
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if suffix in builder.emitter:
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emitter = builder.emitter[suffix]
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builder.emitter[suffix] = SCons.Builder.ListEmitter([emitter, makeEmitCompilationDbEntry(command),])
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env["BUILDERS"]["__COMPILATIONDB_Entry"] = SCons.Builder.Builder(
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action=SCons.Action.Action(CompilationDbEntryAction, None),
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)
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env["BUILDERS"]["__COMPILATIONDB_Database"] = SCons.Builder.Builder(
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action=SCons.Action.Action(WriteCompilationDb, "$COMPILATIONDB_COMSTR"),
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target_scanner=SCons.Scanner.Scanner(function=ScanCompilationDb, node_class=None),
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)
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def CompilationDatabase(env, target):
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result = env.__COMPILATIONDB_Database(target=target, source=[])
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env.AlwaysBuild(result)
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env.NoCache(result)
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return result
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env.AddMethod(CompilationDatabase, "CompilationDatabase")
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def exists(env):
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return True
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