What warnings are included in Clang's -Wall and -Wextra?

Question

I've found Clang's documentation to be quite poor. I haven't been able to find much of a list of available Clang warning flags. I'm interested particularly in C/C++ warnings, but this is a bit of a general issue.

GCC lists and describes warnings here, and also lists what is included in -Wall and -Wextra: https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#Warning-Options

What warning flags are included with Clang's -Wall and -Wextra?

I can scour the Clang release notes for each version to see what new warning flags are introduced each time (e.g. http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html), but is there an easier list and/or description of Clang's warnings? This would be extremely useful. I need to know what is included in -Wall and what is not, so I can consider turning on those that are not.

(I know that -Weverything exists for Clang - might I have to resort to using that and just explicitly disabling the ones I don't like? More documentation would make this much more ideal.)

Answer 1

You can check the source code:

For example,

def : DiagGroup<"all", [Most, Parentheses, Switch]>;  // Warnings enabled by -pedantic.  This is magically filled in by TableGen. def Pedantic : DiagGroup<"pedantic">;  // Aliases. def : DiagGroup<"", [Extra]>;                   // -W = -Wextra 

For -Wall look at the Most, Parentheses, Switch. You can find:

def Most : DiagGroup<"most", [  .... 

further down the file. Similarly, for extra:

def Extra : DiagGroup<"extra", [     MissingFieldInitializers,     IgnoredQualifiers,     InitializerOverrides,     SemiBeforeMethodBody,     MissingMethodReturnType,     SignCompare,     UnusedParameter   ]>;