Date: Fri, 21 May 1999 17:55:13 +0100 From: Damian Hamill <damian@cablenet.net> To: John Polstra <jdp@polstra.com> Cc: Doug Rabson <dfr@nlsystems.com>, hackers@FreeBSD.ORG Subject: Re: dlopen failure Message-ID: <37458FF0.FC9B24C8@cablenet.net> References: <XFMail.990521081849.jdp@polstra.com>
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I have found the problem and it is a problem with make. By chance I did
an ls -l of the directory and noticed the shared object was only 371
bytes and thought nooooooooo that can't be right.
My makefile sez.
mysqlacc.so : mysqlacc.o
ld -Bshareable -o $@ $< -u _floor ../../lib/libV.a ... {other libs}
The '$<' above which should be the implied source i.e. mysqlacc.o wasn't
in the ld line where it should have been, hence the error. Replacing
'$<' with the implied source name of the object file works fine.
Thanks for your help anyway.
John Polstra wrote:
>
> Doug Rabson wrote:
> > On Thu, 20 May 1999, John Polstra wrote:
> >
> >> In article <373C3F3F.A99DBD28@cablenet.net>,
> >> Damian Hamill <damian@cablenet.net> wrote:
> >> > I have a program that is dumping core.
> >> >
> >> > -----------------------------------------------
> >> > Here's the gdb output;
> >> >
> >> > Program terminated with signal 6, Abort trap.
> >> > #0 0x800b728 in _kill ()
> >> > (gdb) bt
> >> > #0 0x800b728 in _kill ()
> >> > #1 0x800b34c in abort ()
> >> > #2 0x8004aa2 in __assert ()
> >> > #3 0x8003b4b in map_object ()
> >> > #4 0x8002e9e in find_symdef ()
> >> > #5 0x800334d in dlopen ()
> >> > #6 0x8049a68 in Get_SQL_Driver (name=0x804c7e4 "mysql") at Vdb.c:150
> >> > #7 0x8049ff9 in GetDefaultDriver () at Vdb.c:254
> >> > #8 0x804a141 in VdbInit (user=0x804bfb1 "nobody", passwd=0x0) at
> >> > Vdb.c:329
> >> > #9 0x8049316 in main ()
> >> > #10 0x8048be5 in _start ()
> >>
> >> I don't know what's going on here, but this stack trace can't be
> >> right. dlopen doesn't call find_symdef, and find_symdef doesn't
> >> call map_object.
> >
> > Isn't map_object() part of the a.out rtld?
>
> Both rtlds have functions named find_symdef() and map_object(). He
> indicated that it was an ELF system, so I assumed he was using the
> ELF rtld. In any case, my statement about the stack trace would be
> equally true for the a.out dynamic linker. :-)
>
> John
> ---
> John Polstra jdp@polstra.com
> John D. Polstra & Co., Inc. Seattle, Washington USA
> "Self-interest is the aphrodisiac of belief." -- James V. DeLong
>
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--
* Damian Hamill M.D. damian@cablenet.net
* CableNet & The Landscape Channel
* http://www.cablenet.net/ http://www.landscapetv.com/
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