Hello World test program for clang 3.7

/opt/local/bin/clang-mp-3.7 -v hw.c -o hw3
clang version 3.7.1 (tags/RELEASE_371/final)
Target: x86_64-apple-darwin10.8.0
Thread model: posix
 "/opt/local/libexec/llvm-3.7/bin/clang" -cc1 -triple x86_64-apple-macosx10.6.0 -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -main-file-name hw.c -mrelocation-model pic -pic-level 2 -mthread-model posix -mdisable-fp-elim -masm-verbose -munwind-tables -target-cpu core2 -target-linker-version 136 -v -dwarf-column-info -resource-dir /opt/local/libexec/llvm-3.7/bin/../lib/clang/3.7.1 -fdebug-compilation-dir /Users/cubytus -ferror-limit 19 -fmessage-length 123 -stack-protector 1 -mstackrealign -fblocks -fobjc-runtime=macosx-10.6.0 -fencode-extended-block-signature -fmax-type-align=16 -fdiagnostics-show-option -fcolor-diagnostics -o /var/folders/y5/y5yCvMAlG1enH9bg3wPS5E+++TI/-Tmp-/hw-0fa725.o -x c hw.c
clang -cc1 version 3.7.1 based upon LLVM 3.7.1 default target x86_64-apple-darwin10.8.0
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /opt/local/libexec/llvm-3.7/bin/../lib/clang/3.7.1/include
 /usr/include
 /System/Library/Frameworks (framework directory)
 /Library/Frameworks (framework directory)
End of search list.
hw.c:5:1: warning: type specifier missing, defaults to 'int' [-Wimplicit-int]
main()
^
1 warning generated.
 "/opt/local/libexec/llvm-3.7/bin/ld" -demangle -dynamic -arch x86_64 -macosx_version_min 10.6.0 -o hw3 -lcrt1.10.6.o /var/folders/y5/y5yCvMAlG1enH9bg3wPS5E+++TI/-Tmp-/hw-0fa725.o -lSystem /opt/local/libexec/llvm-3.7/bin/../lib/clang/3.7.1/lib/darwin/libclang_rt.osx.a