Hi.
Boost infrastructure like Boost.Build needs special care because a problem can be so serious.
Please revert these changes until after the release.
Now that the 1.50 release is out, I've merged the boostcpp.jam changes back into the release branch - so all the stylistic changes and minor tweaks are back in. The problematic 'unversioned library staging with --layout=versioned' code has been cleanly commented out so the behaviour is still the same as before. I tested the Boost library build and it worked fine on my computer (Windows 7, release branch, msvc 9.0). So if anyone wants the unversioned library targets enabled (personally, I do not need them and so do not have an itch to scratch here...) - he'll have to reenable the commented-out code and fix the duplicate target bug. But at least the release branch and the trunk are in sync again. Hope this helps. Best regards, Jurko Gospodnetić