Re: [Boost-build] Multiple calls to "using boost" with the same version

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

AMDG

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