[Bug c/69602] [6 Regression] over-ambitious logical-op warning on EAGAIN vs EWOULDBLOCK

["jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69602

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Even if we look through macros, I'd actually think we should warn here.
Because this is actually:
#define EAGAIN 11
#define EWOULDBLOCK EAGAIN
extern int *__errno_location (void) __attribute__ ((__nothrow__, __leaf__,
__const__));
#define errno (*__errno_location ())

int
foo ()
{
  if (errno == EAGAIN || errno == EWOULDBLOCK)
    return 1;
  return 0;
}
and even errno.h claims that EWOULDBLOCK is EAGAIN.
The warning on this started with r222408.