Hi Rod, You can generate a list of the built in defines by doing this: echo '' | gcc -E -dM -x c - | sort echo '' -- for our mock empty source file gcc -- our favorite toolchain driver (or g++) -E -- preprocess only -dM -- display defines -x c -- treat as C (or -x C++) - -- use stdin as the source file sort -- put the defines in more human readable order You can use that trick with particular #include files to see what the vestigial #defines are (vestigial because it won't list #undef'd identifiers). HTH, --Eljay
