[petsc-dev] [petsc-users] automatic determination of which libraries petsc wants

[Jed Brown]

On Thu, Jan 31, 2013 at 8:00 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

> Jed,  I made this change but it makes everything useless because
> pkg-config PETSc --libs
> -L/Users/barrysmith/Src/petsc-dev/arch-opt/lib -lpetsc
>
> how are people suppose to know what libraries to link against? Note that
>
> pkg-config PETSc --variable=Libs.private
> returns nothing so how the hey does one get this information?
>

Add --static to the args.

$ pkg-config --libs cairo
-lcairo
$ pkg-config --static --libs cairo
-lcairo -lz -lgobject-2.0 -lffi -lglib-2.0 -pthread -lrt -lpcre -lpixman-1
-lfontconfig -lexpat -lfreetype -lz -lbz2 -lpng15 -lm -lz -lm -lxcb-shm
-lxcb-render -lXrender -lXext -lX11 -lpthread -lxcb -lXau -lXdmcp


This is intentional. It allows rebuilding PETSc (e.g., adding new
--download args) without needing to relink all the layers above PETSc.
Libraries and applications that call PETSc and link only with -lpetsc
should not acquire direct dependencies on everything that PETSc depends on.
(Static libraries just don't have a way to manage transitive dependencies,
so it all bubbles up to the top level, but you always have to relink
everything there anyway, so there's no binary stability to gain.)
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