[CMake] static library linking

[Alan W. Irwin]

On 2008-06-15 19:28+0200 Steven Van Ingelgem wrote:

> Hi Alan,
>
>
> I don't know why, but if I take the build command from cmake, and I insert
> the static libraries in there, it works all right. So somehow it's reverting
> itself to some other version of the static and/or dynamic libraries.

You would only link to a dynamic library if there was a bug in ld on your
system so that -Bstatic was ignored.  That's unlikely, but please exclude
that possibility completely by running "ldd -r" on the executable to get a
complete list of shared libraries that are being used (and also the -r
option gives you any unresolved symbols for your executable).

If you are getting the wrong static library, then that means you have some
library search path where something other than /usr/lib is first on that
path.  I wonder if you have the wrong version of the static library in
/usr/local/lib, and that path is first on the library search path for your
distro?

>
> The entire point of me reporting this in fact is that in cmake cvs this
> should have been resolved... Meaning that if I say in my CMakeLists file to
> link against the static library, it should just keep that link... Not try to
> be smart and change it ;-).

You might be right, but I think you have to make your case with more detail.
IOW, please do everything you can to identify the actual library being used
by the -Wl,-Bstatic -lpthread compiler option on your system.  I mentioned
"ldd -r" above to eliminate one (remote) possibility.  Also, I assume there
is a way to get the linker (ld) to list the actual static libraries it uses,
but my linker knowledge doesn't stretch that far. _Thus, I hope some linker
expert here will be able to tell you how to do that._ But if nobody else
comments, perhaps you can find the alternative static library on your system
and infer you are using that (for example, if "nm" on the alternate static
library shows none of the symbols that "ldd -r" shows are undefined for the
executable).

Note, I am not a CMake developer, but I do have an interest in linking
issues which is why I am curious as to why -Wl,-Bstatic -lpthread is not
doing the expected thing on your system.

Alan
__________________________
Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of
Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
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