Issue 1354, clang compilation databases

waflib/extras/clang_compilation_database.py

@@ -0,0 +1,53 @@
+#!/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 json
+from waflib import Logs, TaskGen
+from waflib.Tools import c, cxx
+
+@TaskGen.feature('*')
+@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)
+
+	for task in getattr(self, 'compiled_tasks', []):
+		if isinstance(task, (c.c, cxx.cxx)):
+			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("Store compile comands in %s" % database_file.path_from(ctx.path))
+	clang_db = dict((x["file"], x) for x in json.load(database_file))
+	for task in getattr(ctx, 'clang_compilation_database_tasks', []):
+		try:
+			cmd = task.last_cmd
+		except AttributeError:
+			continue
+		filename = task.inputs[0].abspath()
+		entry = {
+			"directory" : getattr(task, 'cwd', ctx.variant_dir),
+			"command"   : " ".join(cmd),
+			"file"	  : filename,
+		}
+		clang_db[filename] = entry
+	database_file.write(json.dumps(clang_db.values(), indent=2))
+