Hi all,

As a few people have noticed, when you build trunk on Mac OS X with 
optimization enabled, g++ gets an internal compiler error. This seems to be 
caused by generating debug info ... you can work around it by removing the "-g" 
from CXFLAGS or disabling optimization by adding "-O0".

In the medium term, we ought to switch to clang for building on OS X. I think 
this will require flipping AC_PROG_CC and AC_PROG_CXX to search for "c++" 
before "g++". Are there platforms that we support for which this is not 
desirable?

J

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