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| author | Marc-André Lureau <marcandre.lureau@redhat.com> | 2019-07-27 17:25:38 +0400 |
|---|---|---|
| committer | Jussi Pakkanen <jpakkane@gmail.com> | 2019-09-30 22:17:50 +0300 |
| commit | 01569fee2e8130b3ac54659c119e73180d3dafee (patch) | |
| tree | 7fc3b94f3aa921e548455caca7f118ad42b0f677 /mesonbuild/depfile.py | |
| parent | e32b0f8fbbd16b6cdd795a9a596eb56813620055 (diff) | |
| download | meson-01569fee2e8130b3ac54659c119e73180d3dafee.zip meson-01569fee2e8130b3ac54659c119e73180d3dafee.tar.gz meson-01569fee2e8130b3ac54659c119e73180d3dafee.tar.bz2 | |
Add depfile to configure_file()
In qemu, minikconf generates a depfile that meson could use to
automatically reconfigure on dependency change.
Note: someone clever can perhaps find a way to express this with a
ninja rule & depfile=. I didn't manage, so I wrote a simple depfile
parser.
Diffstat (limited to 'mesonbuild/depfile.py')
| -rw-r--r-- | mesonbuild/depfile.py | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/mesonbuild/depfile.py b/mesonbuild/depfile.py new file mode 100644 index 0000000..7a896cd --- /dev/null +++ b/mesonbuild/depfile.py @@ -0,0 +1,85 @@ +# Copyright 2019 Red Hat, Inc. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at + +# http://www.apache.org/licenses/LICENSE-2.0 + +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +import collections + +def parse(lines): + rules = [] + targets = [] + deps = [] + in_deps = False + out = '' + for line in lines: + if not line.endswith('\n'): + line += '\n' + escape = None + for c in line: + if escape: + if escape == '$' and c != '$': + out += '$' + if escape == '\\' and c == '\n': + continue + out += c + escape = None + continue + if c == '\\' or c == '$': + escape = c + continue + elif c in (' ', '\n'): + if out != '': + if in_deps: + deps.append(out) + else: + targets.append(out) + out = '' + if c == '\n': + rules.append((targets, deps)) + targets = [] + deps = [] + in_deps = False + continue + elif c == ':': + targets.append(out) + out = '' + in_deps = True + continue + out += c + return rules + +Target = collections.namedtuple('Target', ['deps']) + +class DepFile: + def __init__(self, lines): + rules = parse(lines) + depfile = {} + for (targets, deps) in rules: + for target in targets: + t = depfile.setdefault(target, Target(deps=set())) + for dep in deps: + t.deps.add(dep) + self.depfile = depfile + + def get_all_dependencies(self, target, visited=None): + deps = set() + if not visited: + visited = set() + if target in visited: + return set() + visited.add(target) + target = self.depfile.get(target) + if not target: + return set() + deps.update(target.deps) + for dep in target.deps: + deps.update(self.get_all_dependencies(dep, visited)) + return deps |