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93 lines
2.7 KiB
Python
93 lines
2.7 KiB
Python
#!/usr/bin/env python
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# encoding: utf-8
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# Christoph Koke, 2013
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"""
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Writes the c and cpp compile commands into build/compile_commands.json
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see http://clang.llvm.org/docs/JSONCompilationDatabase.html
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Usage:
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def configure(conf):
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conf.load('compiler_cxx')
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...
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conf.load('clang_compilation_database')
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"""
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import sys, os, json, shlex, pipes
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from waflib import Logs, TaskGen, Task
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Task.Task.keep_last_cmd = True
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if sys.hexversion >= 0x3030000:
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quote = shlex.quote
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else:
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quote = pipes.quote
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@TaskGen.feature('c', 'cxx')
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@TaskGen.after_method('process_use')
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def collect_compilation_db_tasks(self):
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"Add a compilation database entry for compiled tasks"
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try:
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clang_db = self.bld.clang_compilation_database_tasks
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except AttributeError:
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clang_db = self.bld.clang_compilation_database_tasks = []
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self.bld.add_post_fun(write_compilation_database)
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tup = tuple(y for y in [Task.classes.get(x) for x in ('c', 'cxx')] if y)
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for task in getattr(self, 'compiled_tasks', []):
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if isinstance(task, tup):
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clang_db.append(task)
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def write_compilation_database(ctx):
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"Write the clang compilation database as JSON"
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database_file = ctx.bldnode.make_node('compile_commands.json')
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Logs.info('Build commands will be stored in %s', database_file.path_from(ctx.path))
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try:
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root = json.load(database_file)
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except IOError:
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root = []
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clang_db = dict((x['file'], x) for x in root)
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for task in getattr(ctx, 'clang_compilation_database_tasks', []):
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try:
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cmd = task.last_cmd
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except AttributeError:
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continue
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directory = getattr(task, 'cwd', ctx.variant_dir)
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f_node = task.inputs[0]
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filename = os.path.relpath(f_node.abspath(), directory)
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cmd = " ".join(map(quote, cmd))
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entry = {
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"directory": directory,
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"command": cmd,
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"file": filename,
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}
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clang_db[filename] = entry
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root = list(clang_db.values())
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database_file.write(json.dumps(root, indent=2))
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# Override the runnable_status function to do a dummy/dry run when the file doesn't need to be compiled.
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# This will make sure compile_commands.json is always fully up to date.
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# Previously you could end up with a partial compile_commands.json if the build failed.
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for x in ('c', 'cxx'):
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if x not in Task.classes:
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continue
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t = Task.classes[x]
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def runnable_status(self):
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def exec_command(cmd, **kw):
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pass
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run_status = self.old_runnable_status()
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if run_status == Task.SKIP_ME:
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setattr(self, 'old_exec_command', getattr(self, 'exec_command', None))
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setattr(self, 'exec_command', exec_command)
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self.run()
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setattr(self, 'exec_command', getattr(self, 'old_exec_command', None))
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return run_status
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setattr(t, 'old_runnable_status', getattr(t, 'runnable_status', None))
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setattr(t, 'runnable_status', runnable_status)
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