noreturn.h

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Hash : 01b5720b
Author :
Date : 2020-08-11T01:53:13

Use many __attribute__s with clang.

* m4/gnulib-common.m4 (_Noreturn): Use __attribute__ __noreturn__ also
on clang.
* lib/cdefs.h (__glibc_clang_has_attribute, __glibc_clang_has_builtin):
New macros.
(__THROW, __THROWNL, __NTH, __NTHNL): Use __attribute__ __nothrow__ also
on clang.
(__warndecl, __warnattr, __errordecl): Use __attribute__ __diagnose_if__
also on older clang versions.
(__attribute__): Don't define to empty on clang.
(__attribute_malloc__): Use __attribute__ __malloc__ also on clang.
(__attribute_pure__): Use __attribute__ __pure__ also on clang.
(__attribute_const__): Use __attribute__ __const__ also on clang.
(__attribute_used__): Use __attribute__ __used__ also on clang.
(__attribute_noinline__): Use __attribute__ __noinline__ also on clang.
(__attribute_deprecated__): Use __attribute__ __deprecated__ also on
clang.
(__attribute_format_arg__): Use __attribute__ __format_arg__ also on
clang.
(__attribute_format_strfmon__): Use __attribute__ __format__ __strfmon__
also on clang.
(__nonnull): Use __attribute__ __nonnull__ also on clang.
(__attribute_warn_unused_result__): Use __attribute__
__warn_unused_result__ also on clang.
(__always_inline): Use __attribute__ __always_inline__ also on clang.
(__attribute_artificial__): Use __attribute__ __artificial__ also on
clang >= 7.
(__glibc_unlikely, __glibc_likely): Use __builtin_expect also on older
clang versions.
(_Noreturn): Don't redefine on clang >= 3.5.
* lib/arg-nonnull.h (_GL_ARG_NONNULL): Use __attribute__ __nonnull__
also on clang.
* lib/dirent.in.h (_GL_ATTRIBUTE_PURE): Use __attribute__ __pure__ also
on clang.
* lib/stdlib.in.h (_GL_ATTRIBUTE_PURE): Likewise.
* lib/string.in.h (_GL_ATTRIBUTE_PURE): Likewise.
* lib/wchar.in.h (_GL_ATTRIBUTE_PURE): Likewise.
* lib/stdio.in.h (_GL_ATTRIBUTE_FORMAT): Use __attribute__ __format__
also on clang.
* lib/monetary.in.h (_GL_ATTRIBUTE_FORMAT): Likewise.
* lib/textstyle.in.h (ostream_printf, ostream_vprintf): Likewise.
* lib/unitypes.in.h (_UC_ATTRIBUTE_CONST): Use __attribute__ __const__
also on clang.
(_UC_ATTRIBUTE_PURE): Use __attribute__ __pure__ also on clang.
* lib/noreturn.h (_GL_NORETURN_FUNC, _GL_NORETURN_FUNCPTR): Use
__attribute__ __noreturn__ also on clang.
* lib/obstack.h (__attribute_noreturn__): Likewise.
* lib/file-set.h (record_file): Use __attribute__ __nonnull__ also on
clang.
* lib/argp-help.c (hol_entry_long_iterate): Use __attribute__
always_inline also on clang.
* tests/test-printf-posix.c (func1, func2, func3, func4): Test also on
clang.

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lib/noreturn.h

/* Macros for declaring functions as non-returning.

   Copyright (C) 2017-2020 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

/* Written by Paul Eggert and Bruno Haible.  */

#ifndef _NORETURN_H
#define _NORETURN_H 1

/* A "non-returning" function is a function which cannot return normally.
   It can transfer control only through longjmp(), throw (in C++), or similar
   mechanisms.

   This file defines two macros _GL_NORETURN_FUNC and _GL_NORETURN_FUNCPTR,
   that declare a function to be non-returning.
   _GL_NORETURN_FUNC is for use in function declarations and function
   definitions.
   _GL_NORETURN_FUNCPTR is for use on function pointers.

   Comparison of this file with <stdnoreturn.h>:
   <stdnoreturn.h> defines a macro (or keyword) _Noreturn that declares
   a function to be non-returning.  _Noreturn is only for use in function
   declarations and function definitions.
   Therefore, if the non-returning functions you have to declare are unlikely
   to be accessed through function pointers, and if the efficiency with C++
   compilers other than g++, clang, MSVC++ is not an issue to you, you can use
   module 'stdnoreturn' instead of this one, and _Noreturn instead of
   _GL_NORETURN_FUNC.
 */

/* Declares that a function is nonreturning.
   Use in C only code:
     _GL_NORETURN_FUNC extern void func (void);
     extern _GL_NORETURN_FUNC void func (void);
     extern void _GL_NORETURN_FUNC func (void);
   Use in C++ only code for a function with C linkage:
     extern "C" { _GL_NORETURN_FUNC void func (void); }
   Use in C++ only code for a function with C++ linkage:
     _GL_NORETURN_FUNC extern void func (void);
   Use in C & C++ code for a function with C linkage:
     #ifdef __cplusplus
     extern "C" {
     #endif
     _GL_NORETURN_FUNC void func (void);
     #ifdef __cplusplus
     }
     #endif
   Use in C & C++ code for a function with current language linkage:
     _GL_NORETURN_FUNC extern void func (void);
 */
#if (3 <= __GNUC__ || (__GNUC__ == 2 && 8 <= __GNUC_MINOR__)) \
    || defined __clang__ \
    || (0x5110 <= __SUNPRO_C)
  /* For compatibility with _GL_NORETURN_FUNCPTR on clang, use
     __attribute__((__noreturn__)), not _Noreturn.  */
# define _GL_NORETURN_FUNC __attribute__ ((__noreturn__))
#elif 1200 <= _MSC_VER
  /* Use MSVC specific syntax.  */
# define _GL_NORETURN_FUNC __declspec (noreturn)
#elif defined __cplusplus
  /* Use ISO C++11 syntax when the compiler supports it.  */
# if (__cplusplus >= 201103 && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
     || (_MSC_VER >= 1900)
#  define _GL_NORETURN_FUNC [[noreturn]]
  /* clang++ supports the _Noreturn keyword, but g++ doesn't.  */
# elif defined __clang__
#  define _GL_NORETURN_FUNC _Noreturn
# else
#  define _GL_NORETURN_FUNC /* empty */
# endif
#else
  /* Use ISO C11 syntax when the compiler supports it.  */
# if __STDC_VERSION__ >= 201112 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7)
#  define _GL_NORETURN_FUNC _Noreturn
# else
#  define _GL_NORETURN_FUNC /* empty */
# endif
#endif

/* Declares that a function is nonreturning.
   Use in types and declarations that involve function pointers:
     _GL_NORETURN_FUNCPTR void (*funcptr) (void);
 */
#if (3 <= __GNUC__ || (__GNUC__ == 2 && 8 <= __GNUC_MINOR__)) \
    || defined __clang__ \
    || (0x5110 <= __SUNPRO_C)
# define _GL_NORETURN_FUNCPTR __attribute__ ((__noreturn__))
#else
# define _GL_NORETURN_FUNCPTR /* empty */
#endif

/* Comments about the compiler dependent language features:
   - '_Noreturn'    - standardized by ISO C11, available in C only (not in C++),
                      and not applicable to pointers.
   - '[[noreturn]]' - standardized by ISO C++11, available in C++ only,
                      and not applicable to pointers.
   - '__attribute__((__noreturn__))' - available in GCC and clang only,
                                       both in C and C++.
   - '__declspec(noreturn)' - available in MSVC only,
                              both in C and C++, not applicable to pointers.
 */

#endif /* _NORETURN_H */

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lib/noreturn.h