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Subject: Re: [Boost-build] Multiple calls to "using boost" with the same version
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-06-11 22:02:20


Anthony Foglia wrote:
> In our project we have a sysdefs.jam file at the top of the
> directory structure that sets up the rules for most of the libraries.
> I just replaced the 200+ lines we had for boost libraries with aliases
> to the boost libraries as defined in the boost.jam file that comes
> with boost.
> While working up to this change, I set up a user-config.jam of my
> own to set up boost. Very simple, configures both the system version
> of boost 1.35, and a version of 1.38 I downloaded and compiled in my
> home directory.
> When I changed our repository code, since we haven't been using
> site-config.jam, I put a "using boost" rule in our sysdefs.jam file
> (located in the same directory as our Jamroot). Bjam complained that
> "Boost 1.35 already configured."
> I patched boost.jam to test for duplicate initializations, and if
> the new settings are the same as the old, do nothing. (And print a
> warning if .debug-configuration is set.)

That's probably the best solution.

> Is there a better way? Should/Can I test before calling "using
> boost" in the sysdefs to see if it's been defined earlier (e.g.
> user-config.jam)? Should/Can I catch the error instead?

In Christ,
Steven Watanabe

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