title: clang does not compile a simple c file
body: <p>I've just installed clang in to cygwin:
  clang version 3.1 (trunk 151024)
  TargetL i386-pc-cygwin
  Thread model: posix</p>
  
  <p>However when trying to compile a simple c file (only main), the error occured:</p>
  
  <pre><code>clang version 3.1 (trunk 151024)
  Target: i386-pc-cygwin
  Thread model: posix
   "/usr/local/bin/clang" -cc1 -triple i386-pc-cygwin -S -disable-free -main-file-name t.c -mrelocation-model static -mdisable-fp-elim -mconstructor-aliases -target-cpu pentium4 -momit-leaf-frame-pointer -v -resource-dir /usr/local/bin/../lib/clang/3.1 -fmodule-cache-path /var/tmp/clang-module-cache -fno-dwarf-directory-asm -fdebug-compilation-dir /toolchain4 -ferror-limit 19 -fmessage-length 0 -mstackrealign -fno-use-cxa-atexit -fgnu-runtime -fobjc-runtime-has-arc -fobjc-runtime-has-weak -fobjc-fragile-abi -fdiagnostics-show-option -o /cygdrive/c/Users/Br0ther/AppData/Local/Temp/t-zyOz8h.s -x c t.c
  clang: error: unable to execute command: Program could not be executed
  clang: error: clang frontend command failed due to signal (use -v to see invocation)
  clang: note: diagnostic msg: Please submit a bug report to http://llvm.org/bugs/ and include command line arguments and all diagnostic information.
  clang: error: unable to execute command: Program could not be executed
  clang: note: diagnostic msg: Error generating preprocessed source(s).
  </code></pre>
  
  <p>Any body out there knows what causes the problem? I have no idea what is the meaning of the message:</p>
  
  <pre><code>clang: error: unable to execute command: Program could not be executed
  clang: error: clang frontend command failed due to signal (use -v to see invocation)
  </code></pre>
  
  <p>Your help is greatly appreciated
  NK</p>