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# redo-c
redo-c is an implementation of the redo build system (designed by
Daniel J. Bernstein) in portable C with zero external dependencies.
## Documentation
Please refer to the documentation for
[redo in Python](https://github.com/apenwarr/redo/blob/master/README.md),
or the [tutorial by Jonathan de Boyne Pollard](http://jdebp.eu/FGA/introduction-to-redo.html)
for usage instructions.
## Notes about the redo-c implementation of redo
* Without arguments, `redo` behaves like `redo all`.
* `.do` files always are executed in their directory, arguments are
relative paths.
* Standard output of `.do` files is only captured as build product if
`redo -s` is used, or the environment variable `REDO_STDOUT` is set to 1.
Else, standard output is simply displayed.
* Non-executable `.do` files are run with `/bin/sh -e`.
`redo -x` can be utilized to use `/bin/sh -e -x` instead, for
debugging `.do` files or verbose builds.
* Executable `.do` files are simply executed, and should have a shebang line.
* When a target makes no output, no target file is created. The target
is considered always out of date.
* `default.do` files are checked in all parent directories up to `/`.
* Parallel builds can be started with `redo -j N` (or `JOBS=N redo`),
this uses a job broker similar to but not compatible with GNU make.
* To detect whether a file has changed, we first compare `ctime` and
in case it differs, a SHA2 hash of the contents.
* Dependencies are tracked in `.dep.BASENAME` files all over the tree.
This is an implementation detail.
* Builds can be started from every directory and should yield same results.
* `redo -f` will consider all targets outdated and force a rebuild.
* `redo -k` will keep going if a target failed to build.
## Copying
To the extent possible under law, Leah Neukirchen <leah@vuxu.org>
has waived all copyright and related or neighboring rights to this work.
http://creativecommons.org/publicdomain/zero/1.0/
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