[freetds] FreeTDS 0.64, AIX 5.2, xlc - make check seg fault in ctlib

Lowden, James K james.k.lowden at alliancebernstein.com
Fri Jul 28 14:39:13 EDT 2006

> From: Luke Bakken
> Sent: Friday, July 28, 2006 1:43 PM
> With much manipulation of Makefiles I got FreeTDS to compile and
> install sucessfully on my AIX 5.2 machine. TSQL can connect to my
> SQL 2005 db and I can sucessfully make queries with it.
> However ...
> make check succeeds 15 times in src/tds/unittests but fails in
> src/ctlib/unittests with segfaults in every test. So I thought I'd
> fire up the debugger and see what is going on. Trouble is, I don't
> seem to know how to get gdb (or dbx) to read the debug information
> from the libct.a file. I'm hoping someone here can help nudge me
> in the correct direction - I would love to help out in getting
> FreeTDS better supported on AIX.

I don't know anything about AIX, Luke, but it looks to me like you have
ct-lib symbols.  From your transcript:

(gdb) n
90              ret = cs_ctx_alloc(CS_VERSION_100, ctx);
(gdb) s
cs_ctx_alloc (version=112, ctx=0x2ff22b40) at cs.c:199

	You are now in cs.c, i.e. libct.a.  You have those symbols.  

199             *ctx = (CS_CONTEXT *) malloc(sizeof(CS_CONTEXT));
(gdb) n
200             memset(*ctx, '\0', sizeof(CS_CONTEXT));
(gdb) n
201             tds_ctx = tds_alloc_context(*ctx);
(gdb) s
Program received signal SIGSEGV, Segmentation fault.

	tds_alloc_context() is in libtds, and the fact that you can't
step into it indicates to me that you're missing libtds symbols.  I
think you'll find that libtds is a *static* library.  It might be that
the symbols are stripped on linking?  Or something like that.  



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