dlls containing functions with same names problems

[stenasc@yahoo.com]

Hi,

I have created an C based application in linux that uses a number of
dlls. Within the dlls themselves, the code calls sub functions e.g

dll_1 (Main dll function is called Return_Answer. The code within the
Return_Answer function called another function called Timer which is
in dll_1)

dll2 (Main dll function is called Calculate_Best_ Result. The code
within the Calculate_Best_ Result function called another function
called Timer which is in dll_2)

The Timer functions in each dll are completely different. However,
when I debug dll_1 in gdb, and am stepping through the code, I see
that it jumps to the dll_2 Timer function instead of it's own.

Anyone got any ideas. I have the same code working fine in MSVC. Never
had a problem with it. The commands, I use to compile and link to the
main executable are...

gcc -ggdb -c -fPIC dll_1.c
gcc -ggdb -shared -o libdll_1.so dll_1.o

gcc -ggdb -c -fPIC dll_2.c
gcc -ggdb -shared -o libdll_2.so dll_2.o

The main code file is called test.c

gcc -ggdb -c test.c
gcc -o test -lm test.o -L. -ldll_1 -ldll_2 -ldl

Everything compiles and links fine, so I am at a loss. Any help is
much appreciated.

Regards
Bob

[Chris Dollin]

Re: dlls containing functions with same names problems

stenasc@yahoo.c om wrote:

I have created an C based application in linux that uses a number of
dlls. Within the dlls themselves, the code calls sub functions e.g

dll's aren't part of C; they're an OS-specific extension.

I'd start in comp.unix.progr ammer.

--
Chris "surely you /expect/ problems with a two-Timer?" Dollin

Hewlett-Packard Limited registered no:
registered office: Cain Road, Bracknell, Berks RG12 1HN 690597 England

[Richard Heathfield]

Re: dlls containing functions with same names problems

Roberto Waltman said:

<snip>

(a) Under windows, (at least Windows-CE, which my employer is now
inflicting upon me,) a C function in a library in not visible to
outside code unless it is explicitly exported.

How strange. I've written quite a few programs under Windows that can
call C functions in libraries just fine, without their being explicitly
exported. Perhaps this is a Wince-only phenomenon, and perhaps you're
simply mistaken, or perhaps I'm misinterpreting your statement, or
perhaps my memory is shot to pieces and I'm wrong, or perhaps there's
some other explanation. How to find out the truth? Ask in a Windows
programming group, that's how.

--
Richard Heathfield <http://www.cpax.org.uk >
Email: -www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

[CBFalconer]

Re: dlls containing functions with same names problems

stenasc@yahoo.c om wrote:

>
I have created an C based application in linux that uses a number of
dlls. Within the dlls themselves, the code calls sub functions e.g
>
dll_1 (Main dll function is called Return_Answer. The code within the
Return_Answer function called another function called Timer which is
in dll_1)
>
dll2 (Main dll function is called Calculate_Best_ Result. The code
within the Calculate_Best_ Result function called another function
called Timer which is in dll_2)
>
The Timer functions in each dll are completely different. However,
when I debug dll_1 in gdb, and am stepping through the code, I see
that it jumps to the dll_2 Timer function instead of it's own.
>
Anyone got any ideas. I have the same code working fine in MSVC. Never
had a problem with it. The commands, I use to compile and link to the
main executable are...

Make the functions static.

--
<http://www.cs.auckland .ac.nz/~pgut001/pubs/vista_cost.txt>
<http://www.securityfoc us.com/columnists/423>
<http://www.aaxnet.com/editor/edit043.html>
cbfalconer at maineline dot net



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