One Quickie

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Getting a list of supported compiler flags (llvm->General)

% clang -cc1 --help
OVERVIEW: LLVM 'Clang' Compiler: http://clang.llvm.org

USAGE: clang -cc1 [options] <inputs>

OPTIONS:
  -Eonly                  Just run preprocessor, no output (for timings)
  -E                      Only run the preprocessor
  -F <value>              Add directory to framework include search path
  -H                      Show header includes and nesting depth
...

Unfortunately it doesn't show all the warning flags.