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A restat rule is a rule which is capable of pruning the build tree
depending on the timestamps of its outputs before and after a build.
After a restat rule is rebuilt, Ninja will re-stat each output file
to obtain its current timestamp. If the timestamp is unchanged from
when Ninja initially stat'ed the file before starting the build,
Ninja will mark that output file as clean, and recursively for each
reverse dependency of the output file, recompute its dirty status.
Ninja then stores the most recent timestamp of any input file in the
build log entry associated with the output file. This timestamp
will be treated by future invocations of Ninja as the output file's
modification time instead of the output file's actual modification
time for the purpose of deciding whether it is dirty (but not whether
its reverse dependencies are dirty).
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dirty_ is intended to remain static during the build (unless a restat
occurs), while outputs_ready_ reflects the dynamic state of the build.
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Don't rebuild the manifest when it's already up to date.
The underlying problem was that Builder::Build has a confusing API;
split the API so it's more clear for callers what the return values
mean.
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After much staring at this I think I found the more clear way to
express what it's doing.
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Centralizing printing allows being more careful about what is output.
1) Always include the [2/15] prefix on commands.
2) Make the header command match the error output command.
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