Date: Fri, 23 Jul 2010 15:00:30 +0300
From: Vikentsy Lapa <vlapa AT newman DOT bas-net DOT by>
To: cygwin AT cygwin DOT com
Subject: How to find debug messages from cygwin.dll
Message-ID: <20100723120030.GA4817@wn.serv224>
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For debugging purpose I need own build cygwin.dll.=20
I use snapshot cygwin-src-20100707.tar.bz2
=20
When I go through build process ( as noticed at page http://cygwin.com/faq/=
faq-nochunks.html#faq.programming.building-cygwin )=20
some questions arises.

1) I run command 'make check' and following error appear:
   running gcc -L/oss/build/i686-pc-cygwin/winsup -L/oss/build/i686-pc-cygw=
in/winsup/testsuite -L/oss/build/i686-pc-cygwin/winsup/w32api/lib -isystem =
/usr/src/cygwin-1.7.5-1/winsup/include -isystem /usr/src/cygwin-1.7.5-1/win=
sup/testsuite/include -isystem /usr/src/cygwin-1.7.5-1/winsup/w32api/includ=
e -B/oss/build/i686-pc-cygwin/newlib/ -isystem /oss/build/i686-pc-cygwin/ne=
wlib/targ-include -isystem /usr/src/cygwin-1.7.5-1/newlib/libc/include    -=
I/usr/lib/gcc/i686-pc-cygwin/4.3.4/include -nodefaultlibs -mwin32 -g -DDEBU=
GGING -MD -I/usr/src/cygwin-1.7.5-1/winsup/testsuite/libltp/include -Wall -=
Wstrict-aliasing -Wwrite-strings -fno-common -pipe -fbuiltin -fmessage-leng=
th=3D0 -I. -I/usr/src/cygwin-1.7.5-1/winsup/cygwin/include -I/usr/src/cygwi=
n-1.7.5-1/winsup/cygwin -I/usr/src/cygwin-1.7.5-1/winsup/w32api/include /us=
r/src/cygwin-1.7.5-1/winsup/testsuite/winsup.api/ltp/chown01.c -I/usr/src/c=
ygwin-1.7.5-1/winsup/testsuite/libltp/include /oss/build/i686-pc-cygwin/win=
sup/testsuite/libltp.a /oss/build/i686-pc-cygwin/winsup/testsuite/../cygwin=
/binmode.o -lgcc /oss/build/i686-pc-cygwin/winsup/testsuite/../cygwin/libcy=
gwin0.a -lkernel32 -luser32 -o ltp-chown01.exe
/usr/lib/gcc/i686-pc-cygwin/4.3.4/crtbegin.o:cygming-crtbegin.c:(.data+0x0)=
: undefined reference to `___register_frame_info'
/usr/lib/gcc/i686-pc-cygwin/4.3.4/crtbegin.o:cygming-crtbegin.c:(.data+0x4)=
: undefined reference to `___deregister_frame_info'
FAIL: ltp/chown01.c (compile)

How to determine where libriaries with symbols ___deregister_frame_info  ar=
e placed?=20

2) When I run command ./configure I palce enviroment variable CFLAGS=3D-DDE=
BUGGING. This is enough for switch on debug code ?
  There is mention about option --enable-debuggin in file how-to-debug-cygw=
in.txt, but when I try use it debug code do not insert in binary file.

3)  Where I can find debug messages?
    From source code i see that messages go to syslog.  So I install and co=
nfigure syslog-ng.
    But nothing appear in /var/log/messages.
    What I may try to do?=20

4) Do I need a file /dev/kmsg for debugging output?=20
   There is no kmsg file in my  /dev/ directory.

Any help would be appreciated.

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