[cmake-developers] Compatible INTERFACE user properties and string properties

[Stephen Kelly]

Brad King wrote:

> On 01/10/2013 01:04 PM, Stephen Kelly wrote:
>> the COMPATIBLE_INTERFACE_BOOL property:
>> 
>>  set_property(TARGET Qt4::QAxServer APPEND PROPERTY
>>       COMPATIBLE_INTERFACE_BOOL QT4_NO_LINK_QTMAIN)
> 
> A better name may be "INTERFACE_COMPATIBLE_BOOL" since the compatibility
> requirement is actually part of the interface.

Perhaps. 

I chose COMPATIBLE_INTERFACE_BOOL because it is not INTERFACE_*, which would 
imply a different convention.

If you have no better compromise, I'm happy with either.

> 
> Actually, since you made generator expressions use lazy evaluation, can't
> we introduce a $<FATAL_ERROR:msg> expression that could be used inside
> some condition checker to report failure?

Yes, that sounds like a good idea.

>> implement support in CMake for. For example, setting the CXX_STDLIB
>> property on a target to libc++ would pass -stdlib=libc++ if using clang.
>> What it does for other compilers is up for debate. Linking a target to a
>> library with INTERFACE_CXX_STDLIB=libc++ would set the CXX_STDLIB
>> property on the target libc++ too etc, and un-equal strings in that
>> property would be a generate- time error.
> [snip]
>> Similar to my first point above, this string equality requirement could
>> also be extended to users with a COMPATIBLE_INTERFACE_STRING property.
> 
> Yes, this sounds promising for solving problems like that.

Great.

Thanks,

Steve.