[Boost-build] [pch] gcc woes

From: Johan Nilsson (r.johan.nilsson_at_[hidden])
Date: 2007-10-05 02:25:03

Hi,

after attempting to use precompiled headers toghether with gcc 4.1.2, I 
figured I might as well post my "findings" here.

Pre-4.2.0 gcc can't handle pch and anonymous namespaces in headers, ref: 
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29085

This makes it virtually impossible to use pch toghether with e.g. 
Boost.Lambda, Boost.Parameter to build programs with multiple translation 
units.

Perhaps a note of this could be added to the BBv2 pch docs?

Also - is it possible to disable pch using conditional requirements, making 
the pch rule effectively returning a "null" target?

/ Johan