I can't immediately reproduce here, do you have a test case? I blew away bin.v2/libs/math, so that the math library would rebuild. Then I ran this command:
bin/bjam --user-config=user-config.LINUX_AMDF7 --debug-configuration --without-python threading=multi instruction-set=opteron address-model=64 variant=release link=static,shared --stagedir=stageF7 stage | & tee build.release.math.log
I am attaching the first part of the log, showing the messages from the first gcc.compile.c++.pch and gcc.compile.c++ compilations.
Thanks, still can't reproduce here on Ubuntu, but I found a few messages about this warning from Googling around - it appears to be a Red-Hat specific extension to GCC that chucks out a warning for every single member of a class that has default visibility of hidden :-(( It may even be specific to Fedora-7 and your gcc-4.1 for all I can tell as it appears to have caused quite a few folks problems. Can you try again with the option cxxflags=-Wno-visibility added? Thanks, John.