/* Macros for controlling diagnostic output from the compiler.

   Copyright (C) 2014-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#ifndef _LIBC_DIAG_H

#define _LIBC_DIAG_H 1

/* Ignore the value of an expression when a cast to void does not

   suffice (in particular, for a call to a function declared with

   attribute warn_unused_result).  */

#define ignore_value(x) \

  ({ __typeof__ (x) __ignored_value = (x); (void) __ignored_value; })

/* The macros to control diagnostics are structured like this, rather

   than a single macro that both pushes and pops diagnostic state and

   takes the affected code as an argument, because the GCC pragmas

   work by disabling the diagnostic for a range of source locations

   and do not work when all the pragmas and the affected code are in a

   single macro expansion.  */

/* Push diagnostic state.  */

#define DIAG_PUSH_NEEDS_COMMENT _Pragma ("GCC diagnostic push")

/* Pop diagnostic state.  */

#define DIAG_POP_NEEDS_COMMENT _Pragma ("GCC diagnostic pop")

#define _DIAG_STR1(s) #s

#define _DIAG_STR(s) _DIAG_STR1(s)

/* Ignore the diagnostic OPTION.  VERSION is the most recent GCC

   version for which the diagnostic has been confirmed to appear in

   the absence of the pragma (in the form MAJOR.MINOR for GCC 4.x,

   just MAJOR for GCC 5 and later).  Uses of this pragma should be

   reviewed when the GCC version given is no longer supported for

   building glibc; the version number should always be on the same

   source line as the macro name, so such uses can be found with grep.

   Uses should come with a comment giving more details of the

   diagnostic, and an architecture on which it is seen if possibly

   optimization-related and not in architecture-specific code.  This

   macro should only be used if the diagnostic seems hard to fix (for

   example, optimization-related false positives).  */

#define DIAG_IGNORE_NEEDS_COMMENT(version, option)     \

  _Pragma (_DIAG_STR (GCC diagnostic ignored option))

/* Similar to DIAG_IGNORE_NEEDS_COMMENT the following macro ignores the

   diagnostic OPTION but only if optimizations for size are enabled.

   This is required because different warnings may be generated for

   different optimization levels.  For example a key piece of code may

   only generate a warning when compiled at -Os, but at -O2 you could

   still want the warning to be enabled to catch errors.  In this case

   you would use DIAG_IGNORE_Os_NEEDS_COMMENT to disable the warning

   only for -Os.  */

#ifdef __OPTIMIZE_SIZE__

# define DIAG_IGNORE_Os_NEEDS_COMMENT(version, option) \

  _Pragma (_DIAG_STR (GCC diagnostic ignored option))

#else

# define DIAG_IGNORE_Os_NEEDS_COMMENT(version, option)

#endif

#endif /* libc-diag.h */