I maintain MySQL++ (http://tangentsoft.net/mysql++/), a C++ API for
MySQL. It builds fine under Cygwin when we create a static library, but
linking fails due to undefined symbols when we ask for a shared object.
The symptom is the libtool error "libtool: link: warning: undefined
symbols not allowed in i686-pc-cygwin shared libraries" when creating
the shared object itself. I found some messages in the archive saying
that this can be fixed by using the link flag -no-undefined, but that
didn't help.
Now, libtool just warns here, doesn't return an error code. No .so file
is created in the .libs directory. Also, a mere 8-byte .a file is
created. (It contains "!<arch>\n")
After this point in the MySQL++ build process, several example programs
are built. When linking the first one, we get a spate of errors. I
think this is secondary damage, because it tries to link to that .a
file, but it's basically empty. Naturally g++ can't find any of the
symbol definitions it needs to link the program.
If you need to play with this to understand what I mean, download the
v2.0 beta 2 source from the URL above...it's LGPL.
How do I convince libtool to create the bloody .so file?
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