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Bug 120350

Summary:	Breakpoints do not work in WinAPI application
Product:	cnd	Reporter:	Alexander Pepin <apepin>
Component:	Debugger	Assignee:	_ gordonp <gordonp>
Status:	VERIFIED FIXED
Severity:	blocker	CC:	ttran
Priority:	P1
Version:	6.x
Hardware:	All
OS:	Windows XP
Issue Type:	DEFECT	Exception Reporter:
Attachments:	sample WinAPI application gdb log Patch against release60 version

Description Alexander Pepin 2007-10-29 14:28:50 UTC

This happened when I tried to debug "real-life" Windows application. After I simplified the project and left only
necessary bits to reproduce the bug. 

Steps to reproduce:
- create a simple Windows application using WinAPI (see attached sample project)
- build the application
- set a breakpoint in line 10 in hellowin1.cc (before creating a window)
- set a breakpoint in line 36 in mainwin.cc (in the window message handler)
- start debugger
Result: Application does not stop at breakpoints but starts successfully and application window appears. It looks oddly
but breakpoints start working if I add "#include <iostream.h>" into hellowin1.cc.

Comment 1 Alexander Pepin 2007-10-29 14:30:06 UTC

Created attachment 51894 [details]
sample WinAPI application

Comment 2 Alexander Pepin 2007-10-29 14:41:50 UTC

Created attachment 51899 [details]
gdb log

Comment 3 Alexander Pepin 2007-10-29 14:43:46 UTC

Breakpoints work in Eclipse and in command line GDB.

Comment 4 _ gordonp 2007-11-06 00:19:46 UTC

Since breakpoints in shared libraries can't be set until the shared library is loaded, the standard
way of doing this is to set an invisible and temporary breakpoint at main. When gdb stops at this
breakpoint, it creates the "real" breakpoints.

In a WinAPI app, there is no "main" function so the breakpoints don't get set. I added a check for
Windows and create an invisible/temp breakpoint at WinMain. This successfully completes the breakpoint
validation phase for all apps.

Comment 5 Alexander Pepin 2007-11-07 17:37:34 UTC

verified in trunk build 20071107

Comment 6 Jesse Grodnik 2007-11-07 19:07:10 UTC

This is a requested NB 6.0 high resistance fix.

Comment 7 _ gordonp 2007-11-07 19:24:34 UTC

Created attachment 52682 [details]
Patch against release60 version

Comment 8 Thomas Preisler 2007-11-07 19:56:05 UTC

Code changes reviewed by Thomas Preisler (thp).

Comment 9 _ gordonp 2007-11-08 23:40:09 UTC

Change committed into release60 branch.

Comment 10 Alexander Pepin 2007-11-09 17:26:43 UTC

verified in RC1 build (20071109)