I can do that...I think. Which files need to be preprocessed, and
who should I send them to? Sorry for all the questions, I'm
relatively knew to all of this.

Given this error message:

    CC  -c  -DNDEBUG -DNDEBUG -DBOOST_FILESYSTEM_STATIC_LINK -fast -O4 -xtarget=generic -features=rtti -features=except -I"../../../bin/boost/libs/filesystem/build" -I"/export/home/boost/boost" -I"." -I"/export/home/boost/boost" -o "../../../bin/boost/libs/filesystem/build/libboost_filesystem.a/sunpro/release/exception.o" "/export/home/boost/boost/libs/filesystem/build/../src/exception.cpp"


...failed sunpro-C++-action ../../../bin/boost/libs/filesystem/build/libboost_filesystem.a/sunpro/release/exception.o...
sunpro-C++-action ../../../bin/boost/libs/filesystem/build/libboost_filesystem.a/sunpro/release/operations_posix_windows.o

 >> Assertion:   (../lnk/init.cc, line 1032)
    while processing /export/home/boost/boost/boost/filesystem/path.hpp at line 66.

I'd take the output of this command:

CC -E -DNDEBUG -DNDEBUG -DBOOST_FILESYSTEM_STATIC_LINK -fast -O4 -xtarget=generic -features=rtti -features=except -I"../../../bin/boost/libs/filesystem/build" -I"/export/home/boost/boost" -I"." -I"/export/home/boost/boost" "/export/home/boost/boost/libs/filesystem/build/../src/exception.cpp"

And include that with the internal compiler error message above (-E runs the preprocessor only).

In case that this is an optimizer bug (-O4 thats aggressive!) you might try running the command(s) that crash the compiler with -g or a lower optimization level.