[cmake-developers] target sources property

[Stephen Kelly]

Brad King <brad.king at ...> writes:

> 
> On 07/09/2013 11:30 AM, Stephen Kelly wrote:
> > Brad King <brad.king <at> ...> writes:
> >> On 06/07/2013 09:13 AM, Stephen Kelly wrote:
> >>>    SOURCES $<$<CONFIG:Debug>:other.cpp>
> >>
> >> That has been requested as a feature occasionally.  I'm not sure
> >> it is possible to implement on all the generators though.
> 
> I just checked the VS 6, 9 and 11 IDEs and it is possible to mark
> a source file as excluded from certain configurations.  Those versions
> represent all the VS generators.  I do not see an obvious way to do it
> in Xcode though :(
> 
> > I looked into this a bit and pushed target-SOURCES-property to my clone. The
> > sources would necessarily be config-specific if they are going to depend on
> > the linked libraries.
> > 
> > Can you think of any way around that?
> 
> No.  IIRC we have the same problem with inter-target dependencies and
> we solved it by taking the union of dependencies from all configs.
> Is that right?  I don't think that solution can work for source files.
> Perhaps for Xcode we can generate wrapper sources that conditionally
> #include the real source based on the configuration. 


While that would work for source files, it will not work for object files.

 add_library(obj OBJECT obj.cpp)
 add_library(iface INTERFACE)
 set_property(TARGET iface PROPERTY 
   INTERFACE_SOURCES $<TARGET_PROPERTY:obj,SOURCES>)
 
 add_executable(user main.cpp)
 target_link_libraries(user iface)

I'm sure that can work for makefile generators. Can it work for VS
generators? Given that it will not work for Xcode, can we forego the
#include workaround and simply exclude Xcode from the INTERFACE_SOURCES feature?

Thanks,

Steve.