RE: [PATCH v2 1/6] Bypass GCC attributes on NonStop platform where used.

> On 19/01/18 21:20, Jeff King wrote:
> > On Fri, Jan 19, 2018 at 08:28:48PM +0000, Ramsay Jones wrote:
> >
> >>> diff --git a/remote.c b/remote.c
> >>> index 4e93753e1..c18f9de7f 100644
> >>> --- a/remote.c
> >>> +++ b/remote.c
> >>> @@ -11,6 +11,10 @@
> >>>  #include "mergesort.h"
> >>>  #include "argv-array.h"
> >>>
> >>> +#if defined (__TANDEM)
> >>> +#define __attribute(a)
> >>> +#endif
> >>> +
> >>
> >> Hmm, the only use of __attribute() I can find is in compat/regex/.
> >> In particular, there is no use of __attribute() in regex.c.
> >> [__attribute__() is used in regex.c]
> >>
> >> Is this an old patch which is no longer required?
> >>
> >> puzzled.
> 
> heh, I only just noticed that I (twice) wrote regex.c when I meant remote.c
> instead. Hopefully, that didn't cause too much confusion!
> 
> > I'm puzzled, too. The actual gcc thing is __attribute__(), and we
> > already turn that into a noop via macro expansion if __GNUC__ is not
> > defined (in git-compat-util.h, but see below).
> >
> > __attribute(), without the trailing underscores, is used internally by
> > the regex compat code (but it also converts that into a noop on
> > non-GNUC platforms)>
> 
> Indeed.
> 
> > However the logic in git-compat-util is weird:
> >
> >   #if defined(__HP_cc) && (__HP_cc >= 61000)
> >   #define NORETURN __attribute__((noreturn))
> >   #define NORETURN_PTR
> >   #elif defined(__GNUC__) && !defined(NO_NORETURN)
> >   #define NORETURN __attribute__((__noreturn__))
> >   #define NORETURN_PTR __attribute__((__noreturn__))
> >   #elif defined(_MSC_VER)
> >   #define NORETURN __declspec(noreturn)
> >   #define NORETURN_PTR
> >   #else
> >   #define NORETURN
> >   #define NORETURN_PTR
> >   #ifndef __GNUC__
> >   #ifndef __attribute__
> >   #define __attribute__(x)
> >   #endif
> >   #endif
> >   #endif
> >
> > Most of the conditional is dealing with NORETURN, but then we stick
> > the __attribute()__ handling in the "else" block. Is it possible that
> > this platform triggers __HP_cc, but doesn't actually understand
> > __attribute__?
> 
> That seems unlikely. However, that conditional looks a mess ... ;-)