[Bug breakpoints/16280] New: Step into an inline function with varargs doesn't stop

["psmith at gnu dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16280

            Bug ID: 16280
           Summary: Step into an inline function with varargs doesn't stop
           Product: gdb
           Version: 7.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: breakpoints
          Assignee: unassigned at sourceware dot org
          Reporter: psmith at gnu dot org

Created attachment 7311
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7311&action=edit
Repro case compressed tarball

I am using GCC 4.8.1 and GDB 7.6.1 built with Python 2.7.6 on my GNU/Linux
system.  In a C++ inline function that uses va_list, if I try to step into that
inline function it will not stop and just keep running.  If I use "next" to
skip over the function, that works properly.  If I use "si" to step by
instructions until I get into the inline function, then I can continue to use
normal step/next commands and it works properly.

I've also tried this with GCC 4.8.0 / GDB 7.6 / Python 2.7.5, with the same
result.

Attached is a tar file containing a repro case.  Compile it like this:

    gcc -g -o step main.cpp Step.cpp

Now debugging:

  $ gdb ./step
  GNU gdb (GDB) 7.6.1
  ...
  Reading symbols from ./step...done.
  (gdb) l
  1       #include "Step.h"
  2       
  3       int main(int argc, const char** argv)
  4       {
  5           Step step;
  6           step.show("hi %s\n", "there");
  7           return 0;
  8       }

  (gdb) br 6
  Breakpoint 1 at 0x4006ff: file main.cpp, line 6.

  (gdb) run
  Starting program: ./step 

  Breakpoint 1, main (argc=1, argv=0x7fffffffe638) at main.cpp:6
  6           step.show("hi %s\n", "there");

  (gdb) step
  hi there
  [Inferior 1 (process 24724) exited normally]

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