Re: inter-library-dependency, how?

[Christian Rössel]

Hi Nick,

thanks for the quick response.

Am 09.09.2011 18:01, schrieb Nick Bowler:
> On 2011-09-09 17:56 +0200, Christian Rössel wrote:
> > I want to build a program that depends on a libtool library that depends
> > on a non-libtool library that needs rpath information to be found a runtime.
> >
> > My Makefile.am looks like this:
> > lib_LTLIBRARIES    = libfoo.la
> > libfoo_la_SOURCES  = libfoo.c  libfoo.h
> > libfoo_la_CPPFLAGS = -I/opt/packages/papi/4.1.2.1/include
> > libfoo_la_LDFLAGS  = -L/opt/packages/papi/4.1.2.1/lib
> > libfoo_la_LIBADD   = -lpapi
> >
> > bin_PROGRAMS = foo
> > foo_SOURCES  = foo.c
> > foo_LDADD    = libfoo.la
> [...]
> > Building and linking succeeds, but trying to run ./foo leads to
> > ./foo: error while loading shared libraries: libpapi.so: cannot open
> > shared object file: No such file or directory
> >
> > The library is in the location specified by libfoo_la_LDFLAGS (.a and
> > .so). But the rpath /opt/packages/papi/4.1.2.1/lib is not available. How
> > do I get it into foo without specifying it as
> > foo_LDFLAGS = -Wl,-rpath /opt/packages/papi/4.1.2.1/lib?
>
> Looking at https://www.gnu.org/software/libtool/manual/libtool.html#Link-mode,
>
>    -R libdir
>        If output-file is a program, add libdir to its run-time path. If
>        output-file is a library, add -Rlibdir to its dependency_libs, so
>        that, whenever the library is linked into a program, libdir will
>        be added to its run-time path.
>
> So it seems that adding -R/opt/packages/papi/4.1.2.1/lib to
> libfoo_la_LDFLAGS would do the trick?

Well, like the documentations says, -R/opt/packages/papi/4.1.2.1/lib is
added to the dependency_libs:
dependency_libs=' -R/opt/packages/papi/4.1.2.1/lib
-L/opt/packages/papi/4.1.2.1/lib -lpapi'

But when I link libfoo.la into foo, nothing is added to foo's runpath:
libtool: link: gcc -g -O2 -o foo foo.o  ./.libs/libfoo.a
-L/opt/packages/papi/4.1.2.1/lib -lpapi

So, the problem remains. Any help appreciated.

Thanks,
Christian

> Cheers,


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