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/* Common macro definitions for C include files.
Copyright (C) 2008-2021 Free Software Foundation, Inc.
This program 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 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#ifndef _UNISTRING_CDEFS_H
#define _UNISTRING_CDEFS_H
/* _GL_UNUSED_PARAMETER is a marker that can be prepended to function parameter
declarations for parameters that are not used. This helps to reduce
warnings, such as from GCC -Wunused-parameter. The syntax is as follows:
_GL_UNUSED_PARAMETER type param
or more generally
_GL_UNUSED_PARAMETER param_decl
For example:
_GL_UNUSED_PARAMETER int param
_GL_UNUSED_PARAMETER int *(*param) (void)
*/
#ifndef _GL_UNUSED_PARAMETER
# define _GL_UNUSED_PARAMETER _UC_ATTRIBUTE_MAYBE_UNUSED
#endif
#ifndef _GL_ATTRIBUTE_MALLOC
# define _GL_ATTRIBUTE_MALLOC _UC_ATTRIBUTE_MALLOC
#endif
/* _GL_ATTRIBUTE_DEALLOC (F, I) is for functions returning pointers
that can be freed by passing them as the Ith argument to the
function F. _UC_ATTRIBUTE_DEALLOC_FREE is for functions that
return pointers that can be freed via 'free'; it can be used
only after including stdlib.h. These macros cannot be used on
inline functions. */
#ifndef _GL_ATTRIBUTE_DEALLOC
# define _GL_ATTRIBUTE_DEALLOC _UC_ATTRIBUTE_DEALLOC
#endif
#ifndef _GL_ATTRIBUTE_DEALLOC_FREE
# define _GL_ATTRIBUTE_DEALLOC_FREE _UC_ATTRIBUTE_DEALLOC_FREE
#endif
/* The definitions below are taken from gnulib/m4/gnulib-common.m4,
with prefix _UC instead of prefix _GL. */
/* True if the compiler says it groks GNU C version MAJOR.MINOR. */
#if defined __GNUC__ && defined __GNUC_MINOR__
# define _UC_GNUC_PREREQ(major, minor) \
((major) < __GNUC__ + ((minor) <= __GNUC_MINOR__))
#else
# define _UC_GNUC_PREREQ(major, minor) 0
#endif
#if (defined __has_attribute \
&& (!defined __clang_minor__ \
|| 3 < __clang_major__ + (5 <= __clang_minor__)))
# define _UC_HAS_ATTRIBUTE(attr) __has_attribute (__##attr##__)
#else
# define _UC_HAS_ATTRIBUTE(attr) _UC_ATTR_##attr
# define _UC_ATTR_malloc _UC_GNUC_PREREQ (3, 0)
# define _UC_ATTR_unused _UC_GNUC_PREREQ (2, 7)
#endif
#ifdef __has_c_attribute
# define _UC_HAS_C_ATTRIBUTE(attr) __has_c_attribute (__##attr##__)
#else
# define _UC_HAS_C_ATTRIBUTE(attr) 0
#endif
#if _UC_GNUC_PREREQ (11, 0)
# define _UC_ATTRIBUTE_DEALLOC(f, i) __attribute__ ((__malloc__ (f, i)))
#else
# define _UC_ATTRIBUTE_DEALLOC(f, i)
#endif
#define _UC_ATTRIBUTE_DEALLOC_FREE _UC_ATTRIBUTE_DEALLOC (free, 1)
#if _UC_HAS_ATTRIBUTE (malloc)
# define _UC_ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
#else
# define _UC_ATTRIBUTE_MALLOC
#endif
#if _UC_HAS_C_ATTRIBUTE (maybe_unused)
# define _UC_ATTRIBUTE_MAYBE_UNUSED [[__maybe_unused__]]
#else
# define _UC_ATTRIBUTE_MAYBE_UNUSED _UC_ATTRIBUTE_UNUSED
#endif
#if _UC_HAS_ATTRIBUTE (unused)
# define _UC_ATTRIBUTE_UNUSED __attribute__ ((__unused__))
#else
# define _UC_ATTRIBUTE_UNUSED
#endif
#endif /* _UNISTRING_CDEFS_H */
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