Ninja: separate dependencies for compile steps vs actions/rules/copies

test/ninja/action_dependencies/gyptest-action-dependencies.py

+#!/usr/bin/env python
+
+# Copyright (c) 2009 Google Inc. All rights reserved.

[Nico, 2011/11/08 04:26:57]

daylight saving years

(also elsewhere)

[piman, 2011/11/08 22:01:41]

Done.

+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+Verify that building an object file correctly depends on running actions in
+dependent targets, but not the targets themselves.
+"""
+
+import TestGyp
+
+test = TestGyp.TestGyp(formats=['ninja'])

[Nico, 2011/11/08 04:26:57]

Will this work with other generators? Can you remove the formats= parameter
completely?

[piman, 2011/11/08 22:01:41]

The test will not work with other generators because:
- it explicitly tests the optimization, which is not implemented (yet?) on other
generators
- it relies on the exact path to output object files, which is generator
dependent, and actually, relies on the ability to build only that object file,
which I don't think is available on all generators.

That being said, I think the optimization could be implemented in the make
generator, in which case, it'll be worth the effort to make that test run there.

[Nico, 2011/11/09 19:47:55]

Makes sense. Maybe add this as a comment.
Do you have numbers on how much this helps with -j100? (But I guess we could
increase the 100 on the bots if it helps a lot in make, but only with higher
parallelism)

Are you interested in working on this? :-)

+
+test.run_gyp('action_dependencies.gyp', chdir='src')
+
+chdir = 'relocate/src'
+test.relocate('src', chdir)
+
+test.build('action_dependencies.gyp', 'obj/b.b.o', chdir=chdir)
+
+# The 'a' actions should be run (letting b.c compile), but the a static library
+# should not be built.
+test.built_file_must_not_exist('a', type=test.STATIC_LIB, chdir=chdir)
+test.built_file_must_not_exist('b', type=test.STATIC_LIB, chdir=chdir)
+test.built_file_must_exist('obj/b.b.o', chdir=chdir)
+
+test.build('action_dependencies.gyp', 'obj/c.c.o', chdir=chdir)
+
+# 'a' and 'b' should be built, so that the 'c' action succeeds, letting c.c
+# compile
+test.built_file_must_exist('a', type=test.STATIC_LIB, chdir=chdir)
+test.built_file_must_exist('b', type=test.EXECUTABLE, chdir=chdir)
+test.built_file_must_exist('obj/c.c.o', chdir=chdir)
+
+
+test.pass_test()