$ scons --mute -j 8 --dd --cc=/usr/bin/clang --cxx=/usr/bin/clang++ --cache
scons: Reading SConscript files ...
scons version: 2.3.0
python version: 2 7 5 'final' 0
Checking whether the C++ compiler works(cached) yes
Checking whether the C compiler works(cached) yes
Checking if C++ compiler "/usr/bin/clang++" is GCC... (cached) no
Checking if C++ compiler "/usr/bin/clang++" is clang... (cached) yes
Checking if C compiler "/usr/bin/clang" is clang... (cached) yes
Checking if C compiler supports -Wno-unused-local-typedefs... (cached) yes
Checking if C compiler supports -Wno-unused-function... (cached) yes
Checking if C compiler supports -Wno-unused-private-field... (cached) yes
Checking if C compiler supports -Wno-mismatched-tags... (cached) yes
Checking if C compiler supports -Wno-deprecated-declarations... (cached) yes
Checking if C compiler supports -Wno-tautological-constant-out-of-range-compare... (cached) yes
Checking if C compiler supports -Wno-unused-const-variable... (cached) yes
Checking if C compiler supports -mmacosx-version-min=10.6... (cached) yes
Checking for C header file unistd.h... (cached) yes
Checking whether clock_gettime is declared... (cached) no
Checking for C++ header file execinfo.h... (cached) yes
Checking whether backtrace is declared... (cached) yes
Checking whether backtrace_symbols is declared... (cached) yes
Checking whether backtrace_symbols_fd is declared... (cached) yes
Checking for C library pcap... (cached) yes
Checking if __malloc_hook is declared volatile... (cached) no
scons: done reading SConscript files.
scons: Building targets ...
Compiling build/cached/mongo/db/db.o
error: unknown warning option '-Wno-unused-local-typedefs' [-Werror,-Wunknown-warning-option]
error: unknown warning option '-Wno-unused-const-variable'; did you mean '-Wno-unused-variable'? [-Werror,-Wunknown-warning-option]
...