On Fri, Jun 14, 2002 at 05:30:47PM +0200, Jack Jansen wrote:
>
> On Friday, June 14, 2002, at 04:38 , Thomas Heller wrote:
> >I prefer to insert
> >#ifdef _DEBUG
> > _asm int 3; /* breakpoint */
> >#endif
> >into the problematic sections of my code, and whoops,
> >the MSVC GUI debugger opens just when this code is executed,
> >even if it was started from the command line.
>
> Ok, MSVC finally scored a point with me, this is nifty:-)
You can "set" a breakpoint this way in x86 Linux too. Unfortunately,
when this is not run under the debugger, it simply sends a SIGTRAP to
the process. In theory the standard library could handle SIGTRAP by
invoking the debugger, but 5 minutes fiddling around didn't produce a
very dependable way of doing so.
(gdb) run
Starting program: ./a.out
a
Program received signal SIGTRAP, Trace/breakpoint trap.
main () at bp.c:21
21 printf("b\n");
(gdb) cont
Continuing.
b
#include <stdio.h>
#define _DEBUG
#ifdef _DEBUG
#if defined(WIN32)
#define BREAKPOINT _asm int 3
#elif defined(__GNUC__) && defined(__i386__)
#define BREAKPOINT __asm__ __volatile__ ("int3")
#else
#warning "BREAKPOINT not defined for this OS / Compiler"
#define BREAKPOINT (void)0
#endif
#else
#define _DEBUG (void)0
#endif
main() {
printf("a\n");
BREAKPOINT;
printf("b\n");
return 0;
}
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