compilation clang/fedora23 libobjc2 (github)

[Eduardo Osorio Armenta]

Hello GNUstep-ers 

i'm pretty new to clang compiler...

following the instructions from https://github.com/gnustep/libobjc2/blo
b/1.8.1/INSTALL

found that 
cmake .. -DCMAKE_C_COMPILER=clang 
-DCMAKE_CXX_COMPILER=clang 
-DCMAKE_ASM_COMPILER=clang 
-DCMAKE_ASM_FLAGS=-c

produces output error at $make
[ 42%] Linking C executable CXXExceptions
CMakeFiles/CXXExceptions.dir/CXXException.cc.o: En la función
`throw_int':
...
make[2]: *** [Test/CXXExceptions] Error 1
CMakeFiles/Makefile2:733: recipe for target
'Test/CMakeFiles/CXXExceptions.dir/all' failed
make[1]: *** [Test/CMakeFiles/CXXExceptions.dir/all] Error 2
Makefile:160: recipe for target 'all' failed
make: *** [all] Error 2


tried this:
[under Build folder] $rm -rf *

cmake .. -DCMAKE_C_COMPILER=clang 
-DCMAKE_CXX_COMPILER=clang++        
                        
-DCMAKE_ASM_COMPILER=clang 
-DCMAKE_ASM_FLAGS=-c

everything compiles. And only 2 test fails
        96% tests passed, 2 tests failed out of 50

        The following tests FAILED:
                          7 - BlockImpTest (SEGFAULT)
                          8 - BlockImpTest_optimised (SEGFAULT)
        Errors while running CTest
        Makefile:61: recipe for target 'test' failed
        make: *** [test] Error 8


is this a truly compiler difference?
-DCMAKE_CXX_COMPILER=clang  
        versus
-DCMAKE_CXX_COMPILER=clang++

both display:

[eosorio@localhost Build]$ clang++ --version
clang version 3.7.0 (tags/RELEASE_370/final)
Target: x86_64-redhat-linux-gnu
Thread model: posix
[eosorio@localhost Build]$ clang --version
clang version 3.7.0 (tags/RELEASE_370/final)
Target: x86_64-redhat-linux-gnu
Thread model: posix

thank you,
best regards