[CMake] Config.cmake.in: Conditionally serve static or shared library

[Kim Walisch]

CMake currently does not allow alias libraries for import targets:

$ cmake ..
CMake Error at /usr/local/lib/cmake/primesieve/PrimesieveConfig.cmake:7
(add_library):
  add_library cannot create ALIAS target "my_libprimesieve" because target
  "Primesieve::libprimesieve-static" is IMPORTED.
Call Stack (most recent call first):
  CMakeLists.txt:6 (find_package)

-- Configuring incomplete, errors occurred!

Kim


On Wed, Feb 14, 2018 at 5:34 PM, ThePhD <jm3689 at columbia.edu> wrote:

> I think you can use what's called an "Alias Library": https://cmake.org/
> cmake/help/latest/command/add_library.html#alias-libraries
>
> if (BUILD_SHARED_LIBS)
>      add_library(my_libprimesieve ALIAS libprimesieve)
> else
>      add_library(my_libprimesieve ALIAS libprimesieve-static)
> endif(BUILD_SHARED_LIBS)
>
> Then, set it properly to Primesieve::Primesieve and it should work.
>
>
> On Wed, Feb 14, 2018 at 10:21 AM, Kim Walisch <kim.walisch at gmail.com>
> wrote:
>
>> Hi,
>>
>> My primesieve project builds as both a static and a shared library, hence
>> there are 2 targets in my main CMakeLists.txt:
>>
>> 1) libprimesieve (shared library)
>> 2) libprimesieve-static
>>
>> I am now trying to add support for find_package(Primesieve). Ideally I
>> would like that users can link against libprimesieve as follows:
>>
>> find_package(Primesieve REQUIRED)
>> target_link_libraries(user_library Primesieve::Primesieve)
>>
>> And I want Primesieve::Primesieve to be an alias for
>> Primesieve::libprimesieve if BUILD_SHARED_LIBS=ON (in the user's
>> CMakeLists.txt) and and alias for Primesieve::libprimesieve-static if
>> BUILD_SHARED_LIBS=OFF (or if it is not set).
>>
>> Is this possible?
>> Do you know any library that has already implemented this?
>>
>> Thanks,
>> Kim
>>
>> --
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>
> Powered by www.kitware.com
>
> Please keep messages on-topic and check the CMake FAQ at:
> http://www.cmake.org/Wiki/CMake_FAQ
>
> Kitware offers various services to support the CMake community. For more
> information on each offering, please visit:
>
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>
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