[clang patch] PR20146

[Nathan Sidwell]

This patch fixes a really pedantic error reported as 20146 
http://llvm.org/bugs/show_bug.cgi?id=20146

Apparently in C a void function definition cannot use a qualified void 
return.type.  c99 [6.9.1]/3 says:

> The return type of a function shall be void or an object type other than array type.

There appears no such restriction on a function declaration. (6.9.1 is 
explicitly about a function definition)

C++ appears explicitly bless it in c++ 03 [6.6.3]/3 says:

> A return statement with an expression of type “cv void” can be
 > used only in functions with a return type of cv void; the expression
 > is evaluated just before the function returns to its caller.


OK?

nathan
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