by compiler is required, look for the compiler explicitly such as with
XML_METROWERKS or __APPLE__ (for the Apple GCC compiler).

Add a few tweaks for compatibility with GCC3.1.

This change may address Bug 10649.


git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@173982 13f79535-47bb-0310-9956-ffa450edef68