Fiz uma desinstalação completa e limpa do XCode, excluí as prefs e a pasta complete / Developer e reinstalei o XCode novamente.

Eu crio um novo aplicativo Cocoa, vou para o Target, executando "Get info" no destino e habilito "C / C ++ compiler version" para "LLVM compiler 1.0.2" e pressione Build.

Eu recebo:

ld: warning: directory '/usr/lib/gcc/i686-apple-darwin10/4.2.1/x86_64' following -L not found
ld: warning: directory '/usr/lib/gcc/i686-apple-darwin10/4.2.1/x86_64' following -L not found
ld: warning: directory '/usr/lib/i686-apple-darwin10/4.2.1' following -L not found
ld: warning: directory '/usr/lib/gcc/i686-apple-darwin10/4.2.1' following -L not found
ld: warning: directory '/usr/lib/gcc/i686-apple-darwin10/4.2.1' following -L not found
ld: warning: directory '/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../../i686-apple-darwin10/4.2.1' following -L not found
ld: warning: directory '/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../..' following -L not found
ld: library not found for -lgcc
Command /Developer/usr/bin/clang failed with exit code 1

Alguém pode me ajudar aqui? No entanto, o front-end do LLVM + GCC funciona, mas eu realmente gostaria de usar o Clang (compilador LLVM 1.0.2). Nova instalação do XCode, novo projeto de cacau ainda tem esse problema.