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Subject: Re: How to break cygwin inside dcrt0.cc ?
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From: Mark Geisert <mark@maxrnd.com>
Message-ID: <590BD2A3.8000706@maxrnd.com>
Date: Thu, 4 May 2017 18:17:23 -0700
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Marco Atzeri wrote:
> I am likely missing something obvious, but I do not succeed to put
> a breakpoint inside child_info_fork::alloc_stack
>
> break child_info_fork::alloc_stack
> Function "child_info_fork::alloc_stack" not defined.
>
>   break /usr/src/debug/cygwin-2.8.0-1/winsup/cygwin/dcrt0.cc:408
> No source file named /usr/src/debug/cygwin-2.8.0-1/winsup/cygwin/dcrt0.cc
>
> Is dcrt0.cc built differently than the rest of cygwin dll ?

WFM.  This is with self-built cygwin1.dll.  Only obvious difference is my build 
directory is set up like FAQ says, building in /oss/build and with /oss/src 
symlinked to where Cygwin source tree resides.  Here's what that looks like:

~/src/forker gdb forker
GNU gdb (GDB) (Cygwin 7.10.1-1) 7.10.1
[...]
Reading symbols from forker...done.
(gdb) b child_info_fork::alloc_stack
Function "child_info_fork::alloc_stack" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (child_info_fork::alloc_stack) pending.
(gdb) b main
Breakpoint 2 at 0x100401253: file forker.c, line 158.
(gdb) r 1
Starting program: /home/Mark/src/forker/forker 1
[New Thread 12628.0x494]
[New Thread 12628.0x327c]

Breakpoint 2, main (argc=2, argv=0xffffcc10) at forker.c:158
158         if (argc != 2) {
(gdb) i br
Num     Type           Disp Enb Address            What
1       breakpoint     keep y   0x0000000180046350 in 
child_info_fork::alloc_stack() at /oss/src/winsup/cygwin/dcrt0.cc:407
2       breakpoint     keep y   0x0000000100401253 in main at forker.c:158
         breakpoint already hit 1 time
(gdb)

..mark


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