This describes file names in DBX format.
DBX_WORKING_DIRECTORY
Note that the working directory is always recorded if GDB extensions are
enabled.
DBX_OUTPUT_MAIN_SOURCE_FILENAME (stream, name)
This macro need not be defined if the standard form of output
for DBX debugging information is appropriate.
DBX_OUTPUT_MAIN_SOURCE_DIRECTORY (stream, name)
This macro need not be defined if the standard form of output
for DBX debugging information is appropriate.
DBX_OUTPUT_MAIN_SOURCE_FILE_END (stream, name)
If you don't define this macro, nothing special is output at the end
of compilation, which is correct for most machines.
DBX_OUTPUT_SOURCE_FILENAME (stream, name)
#include, the end of an included file,
or a #line command.
This macro need not be defined if the standard form of output for DBX debugging information is appropriate.