Clang user documentation

I was unsure whether to ask here or in superuser, but this site seemed more appropriate

I'm looking for documentation/analysis on Clang specifically for these two areas:

• comp开发者_JS百科arison of warnings provided by Clang vs. GCC
  • I'm specifically looking for the amount of checking that Clang is doing in comparison to GCC http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
• description of the --analyze flag, what exactly does it check?

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I did ask on the Clang mailing list and the documentation is non-existent at this point.

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