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Hello, <br>
<br>
A great thanks for your extensive reply !<br>
I am going to implement the "clean" approach following your advices.
<br>
<br>
Best regards,<br>
Barth<br>
<br>
On 02/16/2012 12:47 AM, Michael Hertling [via CMake] wrote:
<blockquote cite="mid:4F3C4407.8080305@online.de" type="cite">
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On 02/15/2012 03:48 PM, Barth wrote:
<div class="shrinkable-quote"><br>
> Hello, <br>
> <br>
> I am trying to write a Find script for a library called
DIM. It is something
<br>
> basic but I have a problem with caching. I have an option
to force choosing
<br>
> the static library over the shared one : <br>
> <br>
> Then, I decide what is the name of the library to search
depending on
<br>
> DIM_USE_STATIC and I find it with find_library : <br>
> <br>
> <br>
> The problem is that modifying DIM_USE_STATIC in ccmake
doesn't work even
<br>
> though DIM_LIB_NAME is correct (ie. libdim.a). DIM_LIBRARY
sticks to the
<br>
> previous value (the shared library). <br>
> I know that find_library will not run again if it has
already found the
<br>
> library in the past, thus how should I do ? <br>
> <br>
> Thank you in advance for your help, <br>
> Barth
</div>
<br>
Probably, you just need to reset DIM_LIBRARY to an empty string in
<br>
ccmake each time you change DIM_USE_STATIC; see the FIND_LIBRARY()
<br>
documentation for more information: "If the library is found the
<br>
result is stored in the variable and the search will not be
<br>
repeated *unless the variable is cleared*."
<br>
<br>
However, a conceptually cleaner approach is to consider the shared
and
<br>
the static version of a library as two components of a
multi-component
<br>
package, and write the find module / configuration file
accordingly:
<br>
<br>
(1) Use FIND_LIBRARY() to look for the shared and the static
library
<br>
and define DIM_SHARED_LIBRARY and DIM_STATIC_LIBRARY in the
cache.
<br>
(2) Inspect DIM_FIND_COMPONENTS to see which flavor has been
requested,
<br>
defaulting to "shared" if no components have been requested at
all.
<br>
(3) Warn or bail out if "shared" and "static" have both been
requested
<br>
unless they can be used together - rare but not impossible a
priori.
<br>
(4) DIM_USE_STATIC decides if DIM_LIBRARIES receives
DIM_STATIC_LIBRARY
<br>
or DIM_SHARED_LIBRARY, and because DIM_LIBRARIES is not
cached, it
<br>
can be set anew each time FIND_PACKAGE(DIM ...) is called, so
the
<br>
issue you report on will go away.
<br>
<br>
IMO, most packages providing a library with shared and static
versions
<br>
should be considered in this manner, as this would be a robust
mean to
<br>
specifically select one or the other without the need to reset
cache
<br>
entries or bother with CMAKE_FIND_LIBRARY_SUFFIXES or the like.
<br>
<br>
BTW, this approach would also account for the long-standing
annoyance
<br>
how to have FIND_LIBRARY() differentiate between a static library
and
<br>
an import library on Windows; each library type would simply have
its
<br>
own FIND_LIBRARY() call, and this would make things much easier.
<br>
<br>
Regards,
<br>
<br>
Michael
<br>
--
<br>
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