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#!/usr/bin/env python
# encoding: utf-8
# Christoph Koke, 2013
"""
Writes the c and cpp compile commands into build/compile_commands.json
see http://clang.llvm.org/docs/JSONCompilationDatabase.html
Usage:
def configure(conf):
conf.load('compiler_cxx')
...
conf.load('clang_compilation_database')
"""
import sys, os, json, shlex, pipes
from waflib import Logs, TaskGen, Task
Task.Task.keep_last_cmd = True
@TaskGen.feature('c', 'cxx')
@TaskGen.after_method('process_use')
def collect_compilation_db_tasks(self):
"Add a compilation database entry for compiled tasks"
try:
clang_db = self.bld.clang_compilation_database_tasks
except AttributeError:
clang_db = self.bld.clang_compilation_database_tasks = []
self.bld.add_post_fun(write_compilation_database)
tup = tuple(y for y in [Task.classes.get(x) for x in ('c', 'cxx')] if y)
for task in getattr(self, 'compiled_tasks', []):
if isinstance(task, tup):
clang_db.append(task)
def write_compilation_database(ctx):
"Write the clang compilation database as JSON"
database_file = ctx.bldnode.make_node('compile_commands.json')
Logs.info('Build commands will be stored in %s', database_file.path_from(ctx.path))
try:
root = json.load(database_file)
except IOError:
root = []
clang_db = dict((x['file'], x) for x in root)
for task in getattr(ctx, 'clang_compilation_database_tasks', []):
try:
cmd = task.last_cmd
except AttributeError:
continue
directory = getattr(task, 'cwd', ctx.variant_dir)
f_node = task.inputs[0]
filename = os.path.relpath(f_node.abspath(), directory)
entry = {
"directory": directory,
"arguments": cmd,
"file": filename,
}
clang_db[filename] = entry
root = list(clang_db.values())
database_file.write(json.dumps(root, indent=2))
# Override the runnable_status function to do a dummy/dry run when the file doesn't need to be compiled.
# This will make sure compile_commands.json is always fully up to date.
# Previously you could end up with a partial compile_commands.json if the build failed.
for x in ('c', 'cxx'):
if x not in Task.classes:
continue
t = Task.classes[x]
def runnable_status(self):
def exec_command(cmd, **kw):
pass
run_status = self.old_runnable_status()
if run_status == Task.SKIP_ME:
setattr(self, 'old_exec_command', getattr(self, 'exec_command', None))
setattr(self, 'exec_command', exec_command)
self.run()
setattr(self, 'exec_command', getattr(self, 'old_exec_command', None))
return run_status
setattr(t, 'old_runnable_status', getattr(t, 'runnable_status', None))
setattr(t, 'runnable_status', runnable_status)
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