Config Macros Documentation doesn't include how to dump current values of macros

[daa4453]

The config file macros documentation doesn't describe how to find the current values of the macros. This is a problem when beginning to use a pre-compiled package. Maybe these values could be inserted as a comment line into firebird.conf when the package is built.

If there is a tool that can dump the current values, that could also be helpful. For example gcc -E -dM foo.h will output the predefined macros used by the cpp preprocessor. Something similar might be useful in some program. Thanks.