GDB behaves differently on the final cygwin1.dll 1.7.16 and on a previous one.

[Evgeny Tarasov]

> б You need to install Debug/cygwin-debuginfo package. Then you will be
> б able to set breakpoints by line:
> б (gdb) symbol-file cygwin1.dll
> б Reading symbols from /usr/bin/cygwin1.dll...Reading symbols from
> б /usr/lib/debug/usr/bin/cygwin1.dbg...done.
> б done.
> б (gdb) b _cygtls::call2
> б Breakpoint 1 at 0x610050e0: file
> б /usr/src/debug/cygwin-1.7.16-1/winsup/cygwin/cygtls.cc, line 92.
>
> б Andrey Khalyavin

Hello. It is quite interesting... but could you provide me with step-by-step instructions of how to move further according to the output underneath?

(Single trouble is that I usually use a 3rd party GUI IDE to debug my cygwin code. And this particular IDE (one of its nightly branches), while debugging, sets gdb breakpoints on basis of "mount-like" capabilities of cygwin (i.e. in the form of /cygdrive/disk/cygwin/home/and soon...).
So, I have 2 ways: either hack the sources of the IDE to adjust working with gdb on a bare filename basis (with no paths), or ask cygwin people to help to debug with "mount-like" filenames. Mount-like breakpoints were workable two month ago.)

$ uname -a
CYGWIN_NT-6.1 evgeny 1.7.16(0.262/5/3) 2012-07-20 22:55 i686 Cygwin

$ gdb
GNU gdb (GDB) 7.3.50.20111026-cvs (cygwin-special)
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. б Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-cygwin".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
(gdb) pwd
Working directory /home/evgeny/mip_cb.
(gdb) file comscan.exe
Reading symbols from /home/evgeny/mip_cb/comscan.exe...done.
(gdb) break "/cygdrive/c/cygwin/home/evgeny/mip_cb/Comscan/comscan.cpp:346"
No source file named /cygdrive/c/cygwin/home/evgeny/comscan.cpp.
Make breakpoint pending on future shared library load? (y or [n]) n
(gdb) break comscan.cpp:346
Breakpoint 1 at 0x4043db: file C:/cygwin/home/evgeny/mip_cb/Comscan/comscan.cpp, line 346.
(gdb) cont
The program is not being run.
(gdb) run
Starting program: /home/evgeny/mip_cb/comscan.exe
[New Thread 424.0xdd4]
[New Thread 424.0x870]
[New Thread 424.0x784]
[New Thread 424.0xb14]
[New Thread 424.0x270]

Breakpoint 1, main (argc=1, argv=0x22ac50) at C:/cygwin/home/evgeny/mip_cb/Comscan/comscan.cpp:346
346 б б б б б б б б w.setWindowTitle("QT-4 ComScan");
(gdb) list
341 б б б б {
342 б б б б б б б б QApplication a( argc, argv );
343 б б б б б б б б ComscanWidget w;
344 б б б б б б б б //w.moveToThread(QApplication::instance()->thread());
345 б б б б б б б б w.resize(600, 500 );
346 б б б б б б б б w.setWindowTitle("QT-4 ComScan");
347 б б б б б б б б w.show();
348
349 б б б б б б б б return a.exec();
350 б б б б }

than I'd б changed cygwin1.dll (to june version) and started cygwin bash shell again

$ uname -a
CYGWIN_NT-6.1 evgeny 1.7.16(0.261/5/3) 2012-06-05 15:54 i686 Cygwin

$ gdb
GNU gdb (GDB) 7.3.50.20111026-cvs (cygwin-special)
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. б Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-cygwin".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
(gdb) pwd
Working directory /home/evgeny/mip_cb.
(gdb) file comscan.exe
Reading symbols from /home/evgeny/mip_cb/comscan.exe...done.
(gdb) break "/cygdrive/c/cygwin/home/evgeny/mip_cb/Comscan/comscan.cpp:346"
Breakpoint 1 at 0x4043db: file C:/cygwin/home/evgeny/mip_cb/Comscan/comscan.cpp, line 346.
(gdb) break "comscan.cpp:346"
Note: breakpoint 1 also set at pc 0x4043db.
Breakpoint 2 at 0x4043db: file C:/cygwin/home/evgeny/mip_cb/Comscan/comscan.cpp, line 346.

p.s.
Thus, 2012-06-05 version is fine!

p.p.s
2012-07-20 version is also workable at debug, but on a different mount (if executables and its sources are not in the structure of cygwin deploy tree, but on the D disk)
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