Re: [boost] CMake - one more time

On 23 April 2016 at 02:36, Paul Fultz II wrote:

...

On Apr 22, 2016, at 5:41 PM, Robert Ramey wrote:

On 4/22/16 2:56 PM, Raffi Enficiaud wrote:

...

Certainly, CMake can do everything with the appropriate effort. But so far, although I am a CMake user, I do not know how to do this:

- having the same target name with different target properties: like set(PROJECT_SRC ....) add_library(myproject SHARED ${PROJECT_SRC}) add_library(myproject STATIC ${PROJECT_SRC})

how do you do that? how do you refer to the appropriate variant?

I know it's beside the point of your post, but I can't resist.

I do this in the following way.

a) I set up a cached boolean variable USE_STATIC b) I use the CMake script

if(USE_STATIC) add_library(myproject STATIC ${PROJECT_SRC}) else() add_library(myproject SHARED ${PROJECT_SRC}) elseif()

This is not necessary at all. Cmake provides the `BUILD_SHARED_LIBS` variable that can be set to do this same purpose:

https://cmake.org/cmake/help/v3.5/variable/BUILD_SHARED_LIBS.html

It forces all the targets defined after setting it to use the defined linking mode. Most repositories of tools (outside boost at least) provide several libraries or executables targets. In my experience I end up using different linking modes for different libraries which are in the same repository. Or the target still need to be built and distributed in several linking modes. Therefore, I can never use BUILD_SHARED_LIBS because it is not fined-grained enough. In my opinion, having multiple targets, one for each linking mode that make sense for the library usage, works better.