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[Bug gdb/21506] New: python execute(to_string=True) no longer captures certain output since e7ea3ec7


https://sourceware.org/bugzilla/show_bug.cgi?id=21506

            Bug ID: 21506
           Summary: python execute(to_string=True) no longer captures
                    certain output since e7ea3ec7
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: sourceware-bugzilla at zulan dot net
  Target Milestone: ---

python gdb.execute(to_string=True) no longer captures all output, in particular
for the 'step' command, since f7c382926d. This is limits functionality, e.g.
http://stackoverflow.com/questions/39602306/tracing-program-function-execution-on-source-line-level

Expected result (f7c382926d)

$ ./gdb/gdb ../a.out
GNU gdb (GDB) 7.11.50.20160331-git
Reading symbols from ../a.out...done.
(gdb) break main
Breakpoint 1 at 0x4004aa: file test.c, line 3.
(gdb) run
Starting program: /home/tilsche/code/gdb/a.out 

Breakpoint 1, main () at test.c:3
3           return 4;
(gdb) python x = gdb.execute('step', to_string=True)
(gdb) python print(x)
4       }

Result since e7ea3ec7c6

$ ./gdb/gdb ../a.out                       
GNU gdb (GDB) 7.11.50.20160331-git
Reading symbols from ../a.out...done.
(gdb) break main
Breakpoint 1 at 0x4004aa: file test.c, line 3.
(gdb) run
Starting program: /home/tilsche/code/gdb/a.out 

Breakpoint 1, main () at test.c:3
3           return 4;
(gdb) python x = gdb.execute('step', to_string=True)
4       }
(gdb) python print(x)

Test code:

int main()
{
    return 4;
}

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