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| 1 # Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| 2 # Use of this source code is governed by a BSD-style license that can be |
| 3 # found in the LICENSE file. |
| 4 |
| 5 # This target generates a "last_change.h" header file in the generated files |
| 6 # directory that contains a define of the last revision of the source tree |
| 7 # of the form: |
| 8 # #define LAST_CHANGE "123456" |
| 9 # |
| 10 # The version is a string rather than an integer for extra flexibility (for |
| 11 # example, we may require git hashes in the future). |
| 12 # |
| 13 # All you nede to do is depend on this target, and then from your source code: |
| 14 # #include "build/util/last_change.h" |
| 15 custom("last_change") { |
| 16 script = "//build/util/lastchange.py" |
| 17 |
| 18 # This script must be run before targets depending on us. |
| 19 hard_dep = true |
| 20 |
| 21 # Rerun the script any time this file changes. |
| 22 source_prereqs = [ "//build/util/LASTCHANGE" ] |
| 23 |
| 24 output_header = "$target_gen_dir/last_change.h" |
| 25 outputs = [ output_header ] |
| 26 |
| 27 build_relative_src = rebase_path("//", ".", root_build_dir) |
| 28 build_relative_outputs = rebase_path(output_header, ".", root_build_dir) |
| 29 |
| 30 args = [ |
| 31 "--source-dir=$build_relative_src", |
| 32 "--header=$build_relative_outputs", |
| 33 "--define=LAST_CHANGE", |
| 34 ] |
| 35 } |
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