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Top Forums Programming Can't debug: assert error with gdb (no problem without) Post 302754913 by jim mcnamara on Friday 11th of January 2013 11:45:01 AM
Old 01-11-2013
This is one of the problems with the goto construct. Conditional jumps are a special problem in the logic construction of a progam. I personally seldom use them, except in descent parsers (setjmp/longjmp are a kind of conditional jump, too).

Consider removing most of those jumps. There are some folks who would go on a 'Never use goto' rant. But everything in C++/C is there for good reason, including goto.

But: Absolutely do make err_abort() a separate function.

you should also instrument your code - add fprintf() statements liberally, use the __LINE__ preprocessor command to show where you are in the code. When you have jumps debugging can be extra hard.
 

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LONGJMP(3)							 Library functions							LONGJMP(3)

NAME
longjmp, siglongjmp - non-local jump to a saved stack context SYNOPSIS
#include <setjmp.h> void longjmp(jmp_buf env, int val); void siglongjmp(sigjmp_buf env, int val); DESCRIPTION
longjmp() and setjmp() are useful for dealing with errors and interrupts encountered in a low-level subroutine of a program. longjmp() restores the environment saved by the last call of setjmp() with the corresponding env argument. After longjmp() is completed, program execution continues as if the corresponding call of setjmp() had just returned the value val. longjmp() cannot cause 0 to be returned. If longjmp is invoked with a second argument of 0, 1 will be returned instead. siglongjmp() is similar to longjmp() except for the type of its env argument. If the sigsetjmp() call that set this env used a nonzero savesigs flag, siglongjmp() also restores the set of blocked signals. RETURN VALUE
These functions never return. CONFORMING TO
POSIX NOTES
POSIX does not specify whether longjmp will restore the signal context. If you want to save and restore signal masks, use siglongjmp. longjmp() and siglongjmp() make programs hard to understand and maintain. If possible an alternative should be used. SEE ALSO
setjmp(3), sigsetjmp(3) 1997-03-02 LONGJMP(3)
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