[CMake] target_include_directories SYSTEM adds -isystem to Clang, but not GCC

[digitalriptide]

Did this fix make it into 3.4? After upgrading to 3.4, GCC still seems to
lack -isystem flags on OS X. Is there anything extra I need to do?

Thank you!!

On Thu, Aug 20, 2015 at 8:12 AM, Gregor Jasny <gjasny at googlemail.com> wrote:

> Hello,
>
> On 17/08/15 01:01, digitalriptide wrote:
>
>> When I add SYSTEM to target_include_directories, for example using
>> target_include_directories( my_target SYSTEM PUBLIC ${MY_LIBRARIES} )
>> in Clang, CMake prepends -isystem to the relavent -I/my/library/path
>> type flags. With GCC, however, I see no -isystem added.
>>
>> For reference, this is CMake 3.2.3 on OS X with Apple LLVM version 6.0
>> and GCC 5 provided via MacPorts.
>>
>> Should SYSTEM add -isystem with GCC?
>>
>
> this is a know bug: http://www.cmake.org/Bug/view.php?id=15687
>
> I plan to work on it during the next days so that it may be fixed with
> CMake 3.4.
>
> Thanks,
> Gregor
>
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