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From: K. Noel Belcourt (kbelco_at_[hidden])
Date: 2007-12-11 10:01:49

Hi Philip,

On Dec 10, 2007, at 1:03 PM, Phillip Seaver wrote:

> I don't have the latest version of boost-build (looks like I
> imported it
> from the May 15th nightly release), but I couldn't find a similar
> bug in
> the tracker.
> One of my co-workers ran into an interesting problem. He had a
> directory named "new" in one of his source directories. Every time he
> modified the "new" directory, it caused most (if not all) of the C++
> files to be rebuilt. The reason is that it was looking at the
> timestamp
> of the "new" directory (instead of the system "new" include, I
> believe)
> and seeing that it was newer than the object files.
> Is it possible/reasonable to exclude directories from dependency
> scanner
> matching?

Yes, we had to do the exact same thing. Here's an email I sent to
Rene showing how we did it.

Begin forwarded message:
> From: "K. Noel Belcourt" <kbelco_at_[hidden]>
> Date: August 22, 2007 8:41:56 AM MDT
> To: Rene Rivera <grafikrobot_at_[hidden]>
> Subject: Patch to eliminate directories from the build dependencies
> Hi Rene,
> A while ago, I mentioned that we found a problem with bjam where it
> was depending on the directory time stamps. Our environment is
> intolerant of this since directory timestamps are updated whenever
> a file in the directory is modified (in our case, non-source files
> are modified and this causes things to rebuild). Our solution was
> to set all directory timestamps back to one (1), effectively
> eliminating them from the dependency graph.
> The attached patch to the trunk will introduce this same behavior.
> It also eliminates an unused variable. I don't know if you want to
> put this into bjam but at one point I told you I'd send you this
> patch, so here it is.
> -- Noel

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