In addition to generic error messages, warning: unknown rule X
A rule was invoked that has not been defined with an " using N temp target(s) Targets marked as being temporary (but nonetheless present) have been found. updating N target(s) Targets are out-of-date and will be updated. can't find N target(s) Source files can't be found and there are no actions to create them. can't make N target(s) Due to sources not being found, other targets cannot be made. warning: X depends on itself A target depends on itself either directly or through its sources. don't know how to make X A target is not present and no actions have been defined to create it. X skipped for lack of Y A source failed to build, and thus a target cannot be built. warning: using independent target X
A target that is not a dependency of any other target is being referenced
with X removed
For parallel building to be successful, the dependencies among files must
be properly spelled out, as targets tend to get built in a quickest-first
ordering. Also, beware of un-parallelizable commands that drop fixed-named
files into the current directory, like
A poorly set This section is derived from the official Jam documentation and from experience using it and reading the Jambase rules. We repeat the information here mostly because it is essential to understanding and using Jam, but is not consolidated in a single place. Some of it is missing from the official documentation altogether. We hope it will be useful to anyone wishing to become familiar with Jam and the Boost build system.
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