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Re: How to break cygwin inside dcrt0.cc ?




On 05/05/2017 08:44, Marco Atzeri wrote:
On 05/05/2017 04:01, Mark Geisert wrote:
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

This works for me:

$ gdb test.exe
[...]
Reading symbols from test.exe...done.
(gdb) b main
Breakpoint 1 at 0x1004010dd: file test.c, line 7.
(gdb) r
Starting program: /wip/test.exe

Thread 1 "test" hit Breakpoint 1, main () at while-test.c:7
7          sleep(1);
(gdb) b child_info_fork::alloc_stack()
Breakpoint 2 at 0x1800463f0: file /usr/src/debug/cygwin-2.8.0-1/winsup/cygwin/dcrt0.cc, line 407.
(gdb)

You are in a state where the debug info for cygwin1.dll has been loaded? Trying to set a breakpoint before the program has run won't work, as cygwin1.dll hasn't loaded yet...

By the way it seems that git source can not be built
in cygwin as it lacks configure

What? The configure script is in the git repo and source tarball.

 $ autoreconf
configure.ac:33: error: Please use exactly Autoconf 2.64 instead of 2.69.
config/override.m4:12: _GCC_AUTOCONF_VERSION_CHECK is expanded from...
configure.ac:33: the top level
autom4te-2.69: /usr/bin/m4 failed with exit status: 1
aclocal-1.14: error: echo failed with exit status: 1
autoreconf-2.69: aclocal failed with exit status: 1

This version of autoconf is packaged as gcc-tools-epoch2-autoconf. The announce mail for that explains how to use it.

Moving off such ancient autotools needs to be done, but SHTDI...


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