Re: Trouble making .so (undefined symbols)

["Gerrit P. Haase" <gerrit at familiehaase dot de>]

Warren Young wrote:

> Gerrit P. Haase wrote:
>
> > add the flag -no-undefined to libmysqlpp_la_LDFLAGS?
>
>
> Ah.  I added it to a different automake LD* variable previously.  Now 
> I'm getting a cygmysqlpp-2.dll, which I wasn't before.  This is 
> progress, though incomplete....
>
> > And you also need to use a shared libmysqlclient library.
>
>
> Really?  Why?

Libtool chokes when there is no shared library to link against.  This 
cannot be changed without patching libtool.


> This is a fair inconvenience because Cygwin builds of MySQL aren't easy 
> to come by, probably because the official Win32 build of MySQL works so 
> well.

My latest diff files are from January, *should * still work.


> I would rather continue with my present scheme, which is using an import 
> library for the native build's DLL.  This is, in effect, a "shared 
> libmysqlclient library", but I have a feeling that you mean a 
> Cygwin-built .so file instead.

You need a Cygwin libmysqlclient DLL.

> Now that I have the MySQL++ DLL building, I have a new problem, which is 
> that the examples segfault as soon as they try to use anything from the 
> DLL.  Is this due to using an import library to link to a VC++-built DLL 
> instead of a Cygwin-built .so file?

Yes.

> > Older versions of libtool as included with the tarball don't work.
>
>
> I'll add that to the MySQL++ FAQ.
>
> FWIW, I always use the installed autotools (not the ones in the 
> tarball), as I always use the autotools in "maintainer mode".
>
> >  /usr/bin/install -c -m 644 'coldata.h' '/usr/include/coldata.h'
> >  /usr/bin/install -c -m 644 'compare.h' '/usr/include/compare.h'
> >  /usr/bin/install -c -m 644 'connection.h' '/usr/include/connection.h'
> > [...]
> >  /usr/bin/install -c -m 644 'vallist.h' '/usr/include/vallist.h'
> >
> > You should put the headers into a separate directory, e.g.
> > /usr/include/mysql++.
>
>
> The README.unix file recommends that people use the --includedir 
> configure flag to effect this.

Ok.  I really think it should default to a separate directory though.


> > Send you a patchfile with PM.
>
>
> I got it...it seems to just be all the autotools-generated stuff.  Did I 
> miss a subtlety, skipping over all that?

No you're right, only change besides regenerating configure and
Makefile.in was in Makefile.am where I added --no-undefined to LDFLAGS.

> Thanks for your help so far, Gerrit.


You're welcome,
Gerrit
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