inline

[Bruno Haible]

Alejandro Colomar wrote:
> > > -  inline
> > 
> > Beware! Only 'static inline' is reasonably portable to C99.
> > The semantics of 'extern inline' changed in gcc 4.2 / 4.3 / 4.4.
> 
> Hmmmm, C99's extern inline is one I'm very interested in.  Would you
> mind pointing at the changes in 4.x you're referring to?  I'd like to
> learn about them.

In gcc < 4.3, 'inline' without 'static' has the semantics described in [1].
In gcc >= 4.3, 'inline' without 'static' has the semantics described in [2],
which is consistent with ISO C 99. The old GNU 'inline' semantics can be
obtained through __attribute__ ((__gnu_inline__)).

Gnulib has this summary:

   GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
   inline semantics, unless -fgnu89-inline is used.  It defines a macro
   __GNUC_STDC_INLINE__ to indicate this situation or a macro
   __GNUC_GNU_INLINE__ to indicate the opposite situation.
   GCC 4.2 with -std=c99 or -std=gnu99 implements the GNU C inline
   semantics but warns, unless -fgnu89-inline is used:
     warning: C99 inline functions are not supported; using GNU89
     warning: to disable this warning use -fgnu89-inline or the gnu_inline function attribute
   It defines a macro __GNUC_GNU_INLINE__ to indicate this situation.

Btw, there is a typo in misc/sys/cdefs.h; fix attached.

[1] https://gcc.gnu.org/onlinedocs/gcc-4.2.4/gcc/Inline.html
[2] https://gcc.gnu.org/onlinedocs/gcc-4.3.6/gcc/Inline.html
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