394 lines
13 KiB
C++
394 lines
13 KiB
C++
/* ANSI and traditional C compatability macros
|
|
Copyright (C) 1991-2018 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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 2 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, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
|
|
|
|
/* ANSI and traditional C compatibility macros
|
|
|
|
ANSI C is assumed if __STDC__ is #defined.
|
|
|
|
Macro ANSI C definition Traditional C definition
|
|
----- ---- - ---------- ----------- - ----------
|
|
PTR `void *' `char *'
|
|
const not defined `'
|
|
volatile not defined `'
|
|
signed not defined `'
|
|
|
|
For ease of writing code which uses GCC extensions but needs to be
|
|
portable to other compilers, we provide the GCC_VERSION macro that
|
|
simplifies testing __GNUC__ and __GNUC_MINOR__ together, and various
|
|
wrappers around __attribute__. Also, __extension__ will be #defined
|
|
to nothing if it doesn't work. See below. */
|
|
|
|
#ifndef _ANSIDECL_H
|
|
#define _ANSIDECL_H 1
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* Every source file includes this file,
|
|
so they will all get the switch for lint. */
|
|
/* LINTLIBRARY */
|
|
|
|
/* Using MACRO(x,y) in cpp #if conditionals does not work with some
|
|
older preprocessors. Thus we can't define something like this:
|
|
|
|
#define HAVE_GCC_VERSION(MAJOR, MINOR) \
|
|
(__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR)))
|
|
|
|
and then test "#if HAVE_GCC_VERSION(2,7)".
|
|
|
|
So instead we use the macro below and test it against specific values. */
|
|
|
|
/* This macro simplifies testing whether we are using gcc, and if it
|
|
is of a particular minimum version. (Both major & minor numbers are
|
|
significant.) This macro will evaluate to 0 if we are not using
|
|
gcc at all. */
|
|
#ifndef GCC_VERSION
|
|
#define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
|
|
#endif /* GCC_VERSION */
|
|
|
|
#if defined (__STDC__) || defined(__cplusplus) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32)
|
|
/* All known AIX compilers implement these things (but don't always
|
|
define __STDC__). The RISC/OS MIPS compiler defines these things
|
|
in SVR4 mode, but does not define __STDC__. */
|
|
/* eraxxon@alumni.rice.edu: The Compaq C++ compiler, unlike many other
|
|
C++ compilers, does not define __STDC__, though it acts as if this
|
|
was so. (Verified versions: 5.7, 6.2, 6.3, 6.5) */
|
|
|
|
#define PTR void *
|
|
|
|
#undef const
|
|
#undef volatile
|
|
#undef signed
|
|
|
|
/* inline requires special treatment; it's in C99, and GCC >=2.7 supports
|
|
it too, but it's not in C89. */
|
|
#undef inline
|
|
#if __STDC_VERSION__ >= 199901L || defined(__cplusplus) || (defined(__SUNPRO_C) && defined(__C99FEATURES__))
|
|
/* it's a keyword */
|
|
#else
|
|
# if GCC_VERSION >= 2007
|
|
# define inline __inline__ /* __inline__ prevents -pedantic warnings */
|
|
# else
|
|
# define inline /* nothing */
|
|
# endif
|
|
#endif
|
|
|
|
#else /* Not ANSI C. */
|
|
|
|
#define PTR char *
|
|
|
|
/* some systems define these in header files for non-ansi mode */
|
|
#undef const
|
|
#undef volatile
|
|
#undef signed
|
|
#undef inline
|
|
#define const
|
|
#define volatile
|
|
#define signed
|
|
#define inline
|
|
|
|
#endif /* ANSI C. */
|
|
|
|
/* Define macros for some gcc attributes. This permits us to use the
|
|
macros freely, and know that they will come into play for the
|
|
version of gcc in which they are supported. */
|
|
|
|
#if (GCC_VERSION < 2007)
|
|
# define __attribute__(x)
|
|
#endif
|
|
|
|
/* Attribute __malloc__ on functions was valid as of gcc 2.96. */
|
|
#ifndef ATTRIBUTE_MALLOC
|
|
# if (GCC_VERSION >= 2096)
|
|
# define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
|
|
# else
|
|
# define ATTRIBUTE_MALLOC
|
|
# endif /* GNUC >= 2.96 */
|
|
#endif /* ATTRIBUTE_MALLOC */
|
|
|
|
/* Attributes on labels were valid as of gcc 2.93 and g++ 4.5. For
|
|
g++ an attribute on a label must be followed by a semicolon. */
|
|
#ifndef ATTRIBUTE_UNUSED_LABEL
|
|
# ifndef __cplusplus
|
|
# if GCC_VERSION >= 2093
|
|
# define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED
|
|
# else
|
|
# define ATTRIBUTE_UNUSED_LABEL
|
|
# endif
|
|
# else
|
|
# if GCC_VERSION >= 4005
|
|
# define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED ;
|
|
# else
|
|
# define ATTRIBUTE_UNUSED_LABEL
|
|
# endif
|
|
# endif
|
|
#endif
|
|
|
|
/* Similarly to ARG_UNUSED below. Prior to GCC 3.4, the C++ frontend
|
|
couldn't parse attributes placed after the identifier name, and now
|
|
the entire compiler is built with C++. */
|
|
#ifndef ATTRIBUTE_UNUSED
|
|
#if GCC_VERSION >= 3004
|
|
# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
|
|
#else
|
|
#define ATTRIBUTE_UNUSED
|
|
#endif
|
|
#endif /* ATTRIBUTE_UNUSED */
|
|
|
|
/* Before GCC 3.4, the C++ frontend couldn't parse attributes placed after the
|
|
identifier name. */
|
|
#if ! defined(__cplusplus) || (GCC_VERSION >= 3004)
|
|
# define ARG_UNUSED(NAME) NAME ATTRIBUTE_UNUSED
|
|
#else /* !__cplusplus || GNUC >= 3.4 */
|
|
# define ARG_UNUSED(NAME) NAME
|
|
#endif /* !__cplusplus || GNUC >= 3.4 */
|
|
|
|
#ifndef ATTRIBUTE_NORETURN
|
|
#define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
|
|
#endif /* ATTRIBUTE_NORETURN */
|
|
|
|
/* Attribute `nonnull' was valid as of gcc 3.3. */
|
|
#ifndef ATTRIBUTE_NONNULL
|
|
# if (GCC_VERSION >= 3003)
|
|
# define ATTRIBUTE_NONNULL(m) __attribute__ ((__nonnull__ (m)))
|
|
# else
|
|
# define ATTRIBUTE_NONNULL(m)
|
|
# endif /* GNUC >= 3.3 */
|
|
#endif /* ATTRIBUTE_NONNULL */
|
|
|
|
/* Attribute `returns_nonnull' was valid as of gcc 4.9. */
|
|
#ifndef ATTRIBUTE_RETURNS_NONNULL
|
|
# if (GCC_VERSION >= 4009)
|
|
# define ATTRIBUTE_RETURNS_NONNULL __attribute__ ((__returns_nonnull__))
|
|
# else
|
|
# define ATTRIBUTE_RETURNS_NONNULL
|
|
# endif /* GNUC >= 4.9 */
|
|
#endif /* ATTRIBUTE_RETURNS_NONNULL */
|
|
|
|
/* Attribute `pure' was valid as of gcc 3.0. */
|
|
#ifndef ATTRIBUTE_PURE
|
|
# if (GCC_VERSION >= 3000)
|
|
# define ATTRIBUTE_PURE __attribute__ ((__pure__))
|
|
# else
|
|
# define ATTRIBUTE_PURE
|
|
# endif /* GNUC >= 3.0 */
|
|
#endif /* ATTRIBUTE_PURE */
|
|
|
|
/* Use ATTRIBUTE_PRINTF when the format specifier must not be NULL.
|
|
This was the case for the `printf' format attribute by itself
|
|
before GCC 3.3, but as of 3.3 we need to add the `nonnull'
|
|
attribute to retain this behavior. */
|
|
#ifndef ATTRIBUTE_PRINTF
|
|
#define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n))) ATTRIBUTE_NONNULL(m)
|
|
#define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2)
|
|
#define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3)
|
|
#define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4)
|
|
#define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5)
|
|
#define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6)
|
|
#endif /* ATTRIBUTE_PRINTF */
|
|
|
|
/* Use ATTRIBUTE_FPTR_PRINTF when the format attribute is to be set on
|
|
a function pointer. Format attributes were allowed on function
|
|
pointers as of gcc 3.1. */
|
|
#ifndef ATTRIBUTE_FPTR_PRINTF
|
|
# if (GCC_VERSION >= 3001)
|
|
# define ATTRIBUTE_FPTR_PRINTF(m, n) ATTRIBUTE_PRINTF(m, n)
|
|
# else
|
|
# define ATTRIBUTE_FPTR_PRINTF(m, n)
|
|
# endif /* GNUC >= 3.1 */
|
|
# define ATTRIBUTE_FPTR_PRINTF_1 ATTRIBUTE_FPTR_PRINTF(1, 2)
|
|
# define ATTRIBUTE_FPTR_PRINTF_2 ATTRIBUTE_FPTR_PRINTF(2, 3)
|
|
# define ATTRIBUTE_FPTR_PRINTF_3 ATTRIBUTE_FPTR_PRINTF(3, 4)
|
|
# define ATTRIBUTE_FPTR_PRINTF_4 ATTRIBUTE_FPTR_PRINTF(4, 5)
|
|
# define ATTRIBUTE_FPTR_PRINTF_5 ATTRIBUTE_FPTR_PRINTF(5, 6)
|
|
#endif /* ATTRIBUTE_FPTR_PRINTF */
|
|
|
|
/* Use ATTRIBUTE_NULL_PRINTF when the format specifier may be NULL. A
|
|
NULL format specifier was allowed as of gcc 3.3. */
|
|
#ifndef ATTRIBUTE_NULL_PRINTF
|
|
# if (GCC_VERSION >= 3003)
|
|
# define ATTRIBUTE_NULL_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n)))
|
|
# else
|
|
# define ATTRIBUTE_NULL_PRINTF(m, n)
|
|
# endif /* GNUC >= 3.3 */
|
|
# define ATTRIBUTE_NULL_PRINTF_1 ATTRIBUTE_NULL_PRINTF(1, 2)
|
|
# define ATTRIBUTE_NULL_PRINTF_2 ATTRIBUTE_NULL_PRINTF(2, 3)
|
|
# define ATTRIBUTE_NULL_PRINTF_3 ATTRIBUTE_NULL_PRINTF(3, 4)
|
|
# define ATTRIBUTE_NULL_PRINTF_4 ATTRIBUTE_NULL_PRINTF(4, 5)
|
|
# define ATTRIBUTE_NULL_PRINTF_5 ATTRIBUTE_NULL_PRINTF(5, 6)
|
|
#endif /* ATTRIBUTE_NULL_PRINTF */
|
|
|
|
/* Attribute `sentinel' was valid as of gcc 3.5. */
|
|
#ifndef ATTRIBUTE_SENTINEL
|
|
# if (GCC_VERSION >= 3005)
|
|
# define ATTRIBUTE_SENTINEL __attribute__ ((__sentinel__))
|
|
# else
|
|
# define ATTRIBUTE_SENTINEL
|
|
# endif /* GNUC >= 3.5 */
|
|
#endif /* ATTRIBUTE_SENTINEL */
|
|
|
|
|
|
#ifndef ATTRIBUTE_ALIGNED_ALIGNOF
|
|
# if (GCC_VERSION >= 3000)
|
|
# define ATTRIBUTE_ALIGNED_ALIGNOF(m) __attribute__ ((__aligned__ (__alignof__ (m))))
|
|
# else
|
|
# define ATTRIBUTE_ALIGNED_ALIGNOF(m)
|
|
# endif /* GNUC >= 3.0 */
|
|
#endif /* ATTRIBUTE_ALIGNED_ALIGNOF */
|
|
|
|
/* Useful for structures whose layout must match some binary specification
|
|
regardless of the alignment and padding qualities of the compiler. */
|
|
#ifndef ATTRIBUTE_PACKED
|
|
# define ATTRIBUTE_PACKED __attribute__ ((packed))
|
|
#endif
|
|
|
|
/* Attribute `hot' and `cold' was valid as of gcc 4.3. */
|
|
#ifndef ATTRIBUTE_COLD
|
|
# if (GCC_VERSION >= 4003)
|
|
# define ATTRIBUTE_COLD __attribute__ ((__cold__))
|
|
# else
|
|
# define ATTRIBUTE_COLD
|
|
# endif /* GNUC >= 4.3 */
|
|
#endif /* ATTRIBUTE_COLD */
|
|
#ifndef ATTRIBUTE_HOT
|
|
# if (GCC_VERSION >= 4003)
|
|
# define ATTRIBUTE_HOT __attribute__ ((__hot__))
|
|
# else
|
|
# define ATTRIBUTE_HOT
|
|
# endif /* GNUC >= 4.3 */
|
|
#endif /* ATTRIBUTE_HOT */
|
|
|
|
/* Attribute 'no_sanitize_undefined' was valid as of gcc 4.9. */
|
|
#ifndef ATTRIBUTE_NO_SANITIZE_UNDEFINED
|
|
# if (GCC_VERSION >= 4009)
|
|
# define ATTRIBUTE_NO_SANITIZE_UNDEFINED __attribute__ ((no_sanitize_undefined))
|
|
# else
|
|
# define ATTRIBUTE_NO_SANITIZE_UNDEFINED
|
|
# endif /* GNUC >= 4.9 */
|
|
#endif /* ATTRIBUTE_NO_SANITIZE_UNDEFINED */
|
|
|
|
/* We use __extension__ in some places to suppress -pedantic warnings
|
|
about GCC extensions. This feature didn't work properly before
|
|
gcc 2.8. */
|
|
#if GCC_VERSION < 2008
|
|
#define __extension__
|
|
#endif
|
|
|
|
/* This is used to declare a const variable which should be visible
|
|
outside of the current compilation unit. Use it as
|
|
EXPORTED_CONST int i = 1;
|
|
This is because the semantics of const are different in C and C++.
|
|
"extern const" is permitted in C but it looks strange, and gcc
|
|
warns about it when -Wc++-compat is not used. */
|
|
#ifdef __cplusplus
|
|
#define EXPORTED_CONST extern const
|
|
#else
|
|
#define EXPORTED_CONST const
|
|
#endif
|
|
|
|
/* Be conservative and only use enum bitfields with C++ or GCC.
|
|
FIXME: provide a complete autoconf test for buggy enum bitfields. */
|
|
|
|
#ifdef __cplusplus
|
|
#define ENUM_BITFIELD(TYPE) enum TYPE
|
|
#elif (GCC_VERSION > 2000)
|
|
#define ENUM_BITFIELD(TYPE) __extension__ enum TYPE
|
|
#else
|
|
#define ENUM_BITFIELD(TYPE) unsigned int
|
|
#endif
|
|
|
|
#if __cpp_constexpr >= 200704
|
|
#define CONSTEXPR constexpr
|
|
#else
|
|
#define CONSTEXPR
|
|
#endif
|
|
|
|
/* C++11 adds the ability to add "override" after an implementation of a
|
|
virtual function in a subclass, to:
|
|
(A) document that this is an override of a virtual function
|
|
(B) allow the compiler to issue a warning if it isn't (e.g. a mismatch
|
|
of the type signature).
|
|
|
|
Similarly, it allows us to add a "final" to indicate that no subclass
|
|
may subsequently override the vfunc.
|
|
|
|
Provide OVERRIDE and FINAL as macros, allowing us to get these benefits
|
|
when compiling with C++11 support, but without requiring C++11.
|
|
|
|
For gcc, use "-std=c++11" to enable C++11 support; gcc 6 onwards enables
|
|
this by default (actually GNU++14). */
|
|
|
|
#if defined __cplusplus
|
|
# if __cplusplus >= 201103
|
|
/* C++11 claims to be available: use it. Final/override were only
|
|
implemented in 4.7, though. */
|
|
# if GCC_VERSION < 4007
|
|
# define OVERRIDE
|
|
# define FINAL
|
|
# else
|
|
# define OVERRIDE override
|
|
# define FINAL final
|
|
# endif
|
|
# elif GCC_VERSION >= 4007
|
|
/* G++ 4.7 supports __final in C++98. */
|
|
# define OVERRIDE
|
|
# define FINAL __final
|
|
# else
|
|
/* No C++11 support; leave the macros empty. */
|
|
# define OVERRIDE
|
|
# define FINAL
|
|
# endif
|
|
#else
|
|
/* No C++11 support; leave the macros empty. */
|
|
# define OVERRIDE
|
|
# define FINAL
|
|
#endif
|
|
|
|
/* A macro to disable the copy constructor and assignment operator.
|
|
When building with C++11 and above, the methods are explicitly
|
|
deleted, causing a compile-time error if something tries to copy.
|
|
For C++03, this just declares the methods, causing a link-time
|
|
error if the methods end up called (assuming you don't
|
|
define them). For C++03, for best results, place the macro
|
|
under the private: access specifier, like this,
|
|
|
|
class name_lookup
|
|
{
|
|
private:
|
|
DISABLE_COPY_AND_ASSIGN (name_lookup);
|
|
};
|
|
|
|
so that most attempts at copy are caught at compile-time. */
|
|
|
|
#if __cplusplus >= 201103
|
|
#define DISABLE_COPY_AND_ASSIGN(TYPE) \
|
|
TYPE (const TYPE&) = delete; \
|
|
void operator= (const TYPE &) = delete
|
|
#else
|
|
#define DISABLE_COPY_AND_ASSIGN(TYPE) \
|
|
TYPE (const TYPE&); \
|
|
void operator= (const TYPE &)
|
|
#endif /* __cplusplus >= 201103 */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* ansidecl.h */
|