c: Avoid -Wenum-int-mismatch warning for redeclaration of builtin acc_on_device [PR107041]

The new -Wenum-int-mismatch warning triggers with -Wsystem-headers in
<openacc.h>, for obvious reasons the builtin acc_on_device uses int
type argument rather than enum which isn't defined yet when the builtin
is created, while the OpenACC spec requires it to have acc_device_t
enum argument.  The header makes sure it has int underlying type by using
negative and __INT_MAX__ enumerators.

I've tried to make the builtin typegeneric or just varargs, but that
changes behavior e.g. when one calls it with some C++ class which has
cast operator to acc_device_t, so the following patch instead disables
the warning for this builtin.

2023-04-20  Jakub Jelinek  <jakub@redhat.com>

	PR c/107041
	* c-decl.cc (diagnose_mismatched_decls): Avoid -Wenum-int-mismatch
	warning on acc_on_device declaration.

	* gcc.dg/goacc/pr107041.c: New test.

0 files changed, 0 insertions, 0 deletions