[Bug other/46333] problems with configure -enable-build-with-cxx -disable-bootstrap

[joseph at codesourcery dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46333

--- Comment #20 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2010-11-08 13:12:11 UTC ---
There really is absolutely no point experimenting with this option 
anywhere other than on trunk.  Maybe we should just disable it on 4.5 
branch; it's a GCC-developer-only option at this point.

*Many* problems with C++ compatibility have been fixed on trunk since 4.5 
branched.  See Joern's work on fixing problems building different targets 
with --enable-werror-always (many of the problems fixed are C++ 
compatibility warnings).  No such fixes will be backported to 4.5 branch.  
Since we're now in development stage 3, I expect that the default build 
will not be C++ until after 4.6 branches, which means that C++ fixes will 
not be backported to 4.6 branch either once that branch is created.  Bug 
reports and fixes for such issues are only useful for trunk, and they are 
only useful when each separate problem (each problem with a genuinely 
different cause) is reported as a separate well-defined bug report; 
omnibus issues mixing different problems are useless, although meta-bugs 
marked as depending on the individual C++-compatibility bugs can be 
useful.  As it happens we have such a bug: bug 44433.  So when you have a 
well-defined issue verified to exist on trunk and to be distinct from all 
existing bugs, only then file a separate bug for that issue and mark it as 
blocking bug 44433.