Compiling Shared Objects on Linux with gcc 2.7.2.1

[fi...@s09.es.llnl.gov]

I am trying to compile a shared object library using the -shared option
with gcc 2.7.2.1 on a linux machine. It gives me a segmentation fault.
Is it possible to create a shared object library on linux with gcc?

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[Fergus Henderson]

fi...@s09.es.llnl.gov writes:

>I am trying to compile a shared object library using the -shared option
>with gcc 2.7.2.1 on a linux machine. It gives me a segmentation fault.

What does, gcc, or your application?
If your app gets a segmentation fault, the problem may be that
you forgot to compile your library with `-fpic'.

>Is it possible to create a shared object library on linux with gcc?

Yes. The method is documented in the HOWTO for ELF, I think.

--
Fergus Henderson | Designing grand concepts is fun;
f...@cs.mu.oz.au | finding nitty little bugs is just work.
http://www.cs.mu.oz.au/~fjh | -- Brooks, in "The Mythical Man-Month".
PGP key fingerprint: 00 D7 A2 27 65 09 B6 AC 8B 3E 0F 01 E7 5D C4 3F

[Jeremy Mathers]

In article <5qsaoj$g...@mulga.cs.mu.OZ.AU>,

Fergus Henderson <f...@cs.mu.OZ.AU> wrote:
>fi...@s09.es.llnl.gov writes:
>
>>I am trying to compile a shared object library using the -shared option
>>with gcc 2.7.2.1 on a linux machine. It gives me a segmentation fault.
>
>What does, gcc, or your application?
>If your app gets a segmentation fault, the problem may be that
>you forgot to compile your library with `-fpic'.
>
>>Is it possible to create a shared object library on linux with gcc?
>
>Yes. The method is documented in the HOWTO for ELF, I think.

The attached document contains everything you need to know about creating
and using shared libs under Linux (and Solaris); this is taken directly from
the ELF HOWTO with a few edits/additions by yours truly.

The steps involved in doing a shared library:

1) cat lfoo.c
hello() { puts("hello, world"); }

2) gcc -fPIC -c lfoo.c

3) gcc -shared -Wl,-soname,libfoo.so.1 -o libfoo.so.1.0 lfoo.o
3a) Note: To do the same thing on the Sun (Solaris), use the native ld, thusly:

ld -G -h libfoo.so.1 -o libfoo.so.1 lfoo.o

4) ln libfoo.so.1.0 libfoo.so.1;ln libfoo.so.1.0 libfoo.so

5) cat bar.c
extern hello();
main() { hello(); }

6) gcc -s -o bar bar.c -L. -lfoo

7) sh -c 'LD_LIBRARY_PATH=. ./bar'
hello, world

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