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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/113152] Fortran 2023 half-cycle trigonometric functions
Date: Mon, 22 Jan 2024 17:35:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113152

anlauf at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |anlauf at gcc dot gnu.org

--- Comment #16 from anlauf at gcc dot gnu.org ---
(In reply to Steve Kargl from comment #14)
> On Sun, Jan 21, 2024 at 09:52:39PM +0000, anlauf at gcc dot gnu.org wrote:
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113152
> >=20
> > I think that you cannot do
> >=20
> > +  if (MPFR_HALF_CYCLE)
> >=20
> > you really must use
> >=20
> > #if MPFR_HALF_CYCLE
> >=20
>=20
> #include <stdio.h>
> #include "mpfr.h"
>=20
> #define MPFR_HALF_CYCLE (MPFR_VERSION_MAJOR * 100 + MPFR_VERSION_MINOR >=
=3D
> 402)
>=20
> int
> main(void)
> {
>    if (MPFR_HALF_CYCLE)
>       printf("here\n");
>    else
>       printf("there\n");
>    return (0);
> }
>=20
> % cc -o z -I/usr/local/include a.c && ./z

This does not test the right thing.

% cat sgk.cc
#include <stdio.h>

#define MPFR_HALF_CYCLE 0

int
main(void)
{
   if (MPFR_HALF_CYCLE)
      printf_not_declared_if_0 ("here\n");
   else
      printf ("there\n");
   return (0);
}

% g++ sgk.cc
sgk.cc: In function 'int main()':
sgk.cc:9:7: error: 'printf_not_declared_if_0' was not declared in this scope
       printf_not_declared_if_0 ("here\n");
       ^~~~~~~~~~~~~~~~~~~~~~~~=