Re: [Boost-build] Strange problem when compiling pch

From: Vladimir Prus (ghost_at_[hidden])
Date: 2006-10-13 14:58:25

On Friday 29 September 2006 11:20, Franz Schnyder wrote:

> 'compile-pch' has two targts (x.obj and x.pch) but the 'CC_RSPLINE on
> $(target)' is just done on the first one. I changed the 'compile.pch' rule
> to also set it on the second target (see patch) and to my surprise now the
> 'CC_RSPLINE' isn't empty anymore an anything works fine now ! I don't know
> if this i a bug in bjam or if the set on target needs to be done on all
> targets of the action to ensure that the variable is set correct for the
> action ?

Hi Franz,
when an action produces more than one target, bjam will use settings of only 
one target when computing the build command, and which target will be used 
depends on the order in which bjam traverses the dependency graph.
You fix is right; I will commit you fix as soon as Sourceforge CVS works 
again.

I must admit I have no idea why this problem manifests -- for the example 
Bojan has sent the order of dependency graph traversal should be always the 
same. However, I've decided it does not worth the time to find out how 
exactly this bug is triggered.

Thanks for the fix!

- Volodya