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From: aulwelling_at_[hidden]
Date: 2007-03-13 12:28:43


> -----Original Message-----
> From: aulwelling
> Sent: Wednesday, March 07, 2007 11:49 AM
> To: 'boost-build_at_[hidden]'
> Subject: [BBV2] Cache SHELL output during parse/location of
> generated files
> I am trying to improve the performance of our builds by
> caching the results of system commands that run during the
> parse stage to determine which source files to include in
> various libraries.
> Some background:
> I have a custom rule to generate a shared library from a
> large set of files. Separate text files contain the list of
> functions actually needed for that library. The functions
> are generally in separate source files. I added some SHELL
> commands to the rule so that we will grep through the text
> files and determine which source files to include in the
> library. This ends up taking quite a lot of time when
> building, so I thought I'd try to save the results of the
> grep to a file.
> I have run into 2 main problems:
> First, I can't figure out a nice boost way to save the grep
> results in a file, because I need to results of the grep
> during the parsing stage, but any files I generate using
> boost rules will only get created during the update stage. I
> tried using the make rule to generate a new file with the
> results of the grep in it and then just cat this file in my
> rule, but I don't think this will work due to the parse then
> update nature of boost. If someone has a good solution to
> this I'd love to try it.
> This led to my second problem. I decided I'd need a separate
> script/rule/whatever to run the grep commands if the file
> doesn't needs updating or just cat the file if everything is
> up to date. I'd like this file to end up in the same place
> as my .o and .so files. How do I determine the current
> output directory for built targets (meaning
> build-dir/.../linux/gcc/debug or whatever) so I can pass it
> to my rule/script?
> I'd greatly appreciate any help with either of these issues.
> Thanks,
> Ashley

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