__attribute__((__format__)) syntax bug

["Piotr Wyderski" <piotr dot wyderski at hoga dot pl>]

Hello,

there's a bug in the syntax of the __attribute__((__format__))
in C++. It works correctly with static class member functions
and "free-standing" functions, but nonstatic member functions
need to shift the argument positions by 1, as shown below.

class X {

    VOID F(s,...) __attribute__((__format__(__printf__,2,3)));
};

"s" is the first parameter, but must be indicated as the second one.
I suspect this is because of implicit "this" pointer passing, but the
end user should not see such things. So there are two possible
solutions:

1. Fix the compiler to detect whether the __format__-ed function
is static or nonstatic. This would be the cleanest solution.

2. Update the product documentation to indicate this behaviour.
This would be a dirty kludge, but acceptable, if further compilers
will be backward-compatible with this bug.

    Best regards
    Piotr Wyderski



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