[PATCH] Use __gnu_inline__ for __extern_always_inline in g++-4.2

[Richard Smith]

Ping.

On Fri, Dec 14, 2012 at 4:10 PM, Richard Smith <richard@metafoo.co.uk> wrote:
>
> Hi,
>
> _FORTIFY_SOURCE's __extern_always_inline macro currently only includes
> the __gnu_inline__ attribute in C++ mode for gcc >= 4.3. However,
> __gnu_inline__ semantics are always desired for the
> __extern_always_inline functions, and are available in g++ 4.2 (and
> some releases of g++ 4.1). The attached patch causes the
> __gnu_inline__ attribute to be used in C++ whenever the compiler
> supports it and it is not the default, that is:
>
>  * Whenever __GNUC_STDC_INLINE__ is defined, which indicates that we
> are in C, and __gnu_inline__ is available and is not the default.
>  * Whenever __GNUC_GNU_INLINE__ is defined in C++ mode, which
> indicates that __gnu_inline__ is available (GNU inline semantics are
> never the default in C++ mode).
>
> This causes g++-4.2 to stop emitting weak definitions for the fortify
> wrapper functions if they can't be inlined, and also improves Clang
> compatibility.
>
> Thanks!
> Richard
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