[cmake-developers] Shared libraries

[Chuck Atkins]

Hi Tony,

I expect what your seeing is likely the result of how MaraiaDBhas
specifically implemented their CMake build.  The only builtin CMake
variable to control this is BUILD_SHARED_LIBS, which when set to "ON"
changes the behavior of add_library(foo) to be add_library(foo SHARED),
instead of the default add_library(foo STATIC).  The other
BUILD_STATIC_LIBS and DISABLE_SHARED are variables are not builtin to CMake
and are part of however they have chosen to implement their build.

CMake builds are typically designed to produce a single configuration, i.e.
shared release or static debug, etc.  Often, however, because to have the
flexibility to do otherwise. projects will try to instead implement a build
that produces several configurations in a single pass.  It seems this is
what MariaDB has done and as such the variables to control it will be
unique and specific to that project and how they've decided to implement it.

----------
Chuck Atkins
Staff R&D Engineer, Scientific Computing
Kitware, Inc.


On Thu, Aug 9, 2018 at 12:23 PM REIX, Tony <tony.reix at atos.net> wrote:

> Hi,
>
>
> On AIX, when building MongoC 1.11, cmake 3.11.4 generates lib*.so files
> and lib*.a files which contain .o files.
>
> On AIX, we should get libraries lib*.a containing the lib*.so file.
>
> I've tried to use:
>
>     -DBUILD_SHARED_LIBS=ON              \
>     -DBUILD_STATIC_LIBS=OFF \
>     -DCMAKE_C_CREATE_SHARED_LIBRARY=ON  \
>     -DCMAKE_CXX_CREATE_SHARED_LIBRARY=ON
> and I see that, for MariaDB, someone has tried with:
>
>     -DDISABLE_SHARED=OFF
>
>
> None seems to work.
>
>
> Which CMake variable should I use for asking CMAKE to generate shared
> libraries rather than static ones: lib*.a file containing .so files rather
> than .o files.
>
>
> Thanks
>
>
> Cordialement,
>
> Tony Reix
>
> tony.reix at atos.net
>
> ATOS / Bull SAS
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> IBM Coop Architect & Technical Leader
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