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new module 'noreturn'
From: |
Bruno Haible |
Subject: |
new module 'noreturn' |
Date: |
Wed, 26 Apr 2017 23:53:14 +0200 |
User-agent: |
KMail/5.1.3 (Linux/4.4.0-75-generic; KDE/5.18.0; x86_64; ; ) |
Here's a proposed module 'noreturn' (attached).
The most interesting file is this one:
================================ lib/noreturn.h ================================
/* Macros for declaring functions as non-returning.
Copyright (C) 2017 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 <http://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.
*/
/* This file is based on the following 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.
*/
/* 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__)) \
|| (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]]
# 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__)) \
|| (0x5110 <= __SUNPRO_C)
# define _GL_NORETURN_FUNCPTR __attribute__ ((__noreturn__))
#else
# define _GL_NORETURN_FUNCPTR /* empty */
#endif
#endif /* _NORETURN_H */
0001-noreturn-New-module.patch
Description: Text Data
- new module 'noreturn',
Bruno Haible <=