[CMake] Location of library to be linked changing over time

[Adolfo Rodríguez]

Hi Bill,

When you invoke find_library, FOO is created as a cache entry. As long as
FOO has a value (i.e., not FOO_NOTFOUND) find_library will not refresh its
contents on succesive runs of cmake. If you unset(FOO CACHE) and rerun
cmake, then the foo library will be searched for again.
Is this a good enough solution for your situation?

Regards,

Adolfo

On Thu, Apr 30, 2009 at 9:55 PM, Bill O'Hara <billtohara at gmail.com> wrote:

> Lets say I have a CMakeLists.txt that looks like this
>
> find_library(FOO foo /tmp/a /tmp/b)
> add_executable(bar bar.c)
> target_link_libraries(bar ${FOO})
> add_test(test_bar bar)
>
> then I run cmake, FOO is filled in with the located library from /tmp/b,
> and I run make all;make test. All is good. If I change /tmp/b/libfoo.a then
> when I run make test the executable is relinked before I execute it. All is
> good again.
>
> Now lets say a newer copy of the library appears in /tmp/a.
>
> When I run make test, what I'd like to happen is that we notice it has
> appeared, and relink against it because we prefer to use /tmp/a/libfoo.a if
> it exists (hence the order in the find_library).
>
> Is there a way to make that happen? I think if I wrote a raw makefile I
> could do this with vpaths or somesuch and still get the dependency checking
> ok. Is there a way with cmake?
>
> Thanks
> b.
>
>
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-- 
Adolfo Rodríguez Tsouroukdissian

Robotics engineer
PAL ROBOTICS S.L
http://www.pal-robotics.com
Tel. +34.93.414.53.47
Fax.+34.93.209.11.09
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