Category
@PROCESS
None.
Purpose
Controls the amount of debugging traceback information that is included in the object files.
Defaults
Not applicable.
Parameters
- full
- The object code contains full traceback information. The program is debuggable, and if it stops because of a runtime exception, it produces a traceback listing that includes the names of all procedures in the call chain.
- none
- The object code contains no traceback information at all. You cannot debug the program, because a debugger or other code-examination tool cannot unwind the program's stack at run time. If the program stops because of a runtime exception, it does not explain where the exception occurred.
- small
- The object code contains traceback information but not the names of procedures or information about procedure parameters. You can debug the program, but some non-essential information is unavailable to the debugger. If the program stops because of a runtime exception, it explains where the exception occurred but reports machine addresses rather than procedure names.
Defaults
- Code compiled with -g or without -O has full traceback information (-qtbtable=full).
- Code compiled with -O or higher optimization contains less traceback information (-qtbtable=small).
Usage
This option is most suitable for programs that contain many long procedure names, such as the internal names constructed for module procedures. You may find it more applicable to C++ programs than to Fortran programs.
You can use this option to make your program smaller, at the cost of making it harder to debug. When you reach the production stage and want to produce a program that is as compact as possible, you can specify -qtbtable=none. Otherwise, the usual defaults apply.
Restrictions
To use the performance tools, such as tprof, in the AIX® Performance Toolbox, you must compile the Fortran programs with -qtbtable=full.