[CMake] COMPONENT question

[iosif neitzke]

On 10/31/2016 11:42 AM, Dave Flogeras wrote:
> Hi, are static libraries able to be added to a component?

Yes!

> 
> The following minimal example doesn't work as I expected:
> 
> CMAKE_MINIMUM_REQUIRED( VERSION 3.0.0 )
> PROJECT( foo )
> 
> ADD_LIBRARY( foo foo.c )
> INSTALL( TARGETS foo ARCHIVE DESTINATION lib
>                      RUNTIME DESTINATION bin
>                      LIBRARY DESTINATION bin
>                      COMPONENT bar )
> 
> INCLUDE( CPack )
> 
> If I run "make list_install_components" it says "Unspecified"
> 
> However, if I add "SHARED" to the ADD_LIBRARY call (or set
> BUILD_SHARED_LIBS), it lists the component as "bar" which is what I'd
> expect.
> 

Try something like:
INSTALL( TARGETS foo ARCHIVE DESTINATION lib COMPONENT bar
                     RUNTIME DESTINATION bin COMPONENT bar
                     LIBRARY DESTINATION bin COMPONENT bar )

The nesting of brackets "[]" in docs [0], requires a COMPONENT keyword
and argument (should you choose to use components) for each kind of
target file keyword (ARCHIVE, RUNTIME, LIBRARY, etc..) you use.

I believe you get the puzzling behavior varying with STATIC versus
SHARED library type because of the way the command is parsed.  When
building a STATIC library, there is only an ARCHIVE, which has no
COMPONENT listed, so you get "Unspecified" when listing components.
When building a SHARED library on non-DLL platforms, the binary is a
LIBRARY target, which has the COMPONENT "bar" listed.

Each kind of target file keyword (ARCHIVE, RUNTIME, LIBRARY, etc..) has
its own list of subsequent properties.

[0]
https://cmake.org/cmake/help/v3.7/command/install.html#installing-targets

[1] example in ParaView:
https://github.com/Kitware/ParaView/blob/6714c5c4d1e643f451421dd1004d9540d8607524/CMakeLists.txt#L710

> Is this a bug, or by design?  I'm attempting to figure out how I can
> separate shared/static libraries in my project for different install
> types.  For example, if I am packaging a binary only install, I don't
> need to install static libraries, but I would need the runtime libraries.
> 
> Dave
> 
>