-/* ANSI and traditional C compatability macros
- Copyright (C) 1991-2022 Free Software Foundation, Inc.
+/* Compiler compatibility macros
+ Copyright (C) 1991-2024 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
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
+/* 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
#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__))
+#if (!defined(__cplusplus) && __STDC_VERSION__ >= 199901L) || defined(__cplusplus) || (defined(__SUNPRO_C) && defined(__C99FEATURES__))
/* it's a keyword */
#else
# if GCC_VERSION >= 2007
# 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. */
/* Attribute `warn_unused_result' was valid as of gcc 3.3. */
#ifndef ATTRIBUTE_WARN_UNUSED_RESULT
# if GCC_VERSION >= 3003
-# define ATTRIBUTE_WARN_UNUSED_RESULT __attribute__ ((warn_unused_result))
+# define ATTRIBUTE_WARN_UNUSED_RESULT __attribute__ ((__warn_unused_result__))
# else
# define ATTRIBUTE_WARN_UNUSED_RESULT
# endif
#define ENUM_BITFIELD(TYPE) unsigned int
#endif
-#if __cpp_constexpr >= 200704
+#if defined(__cplusplus) && __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.
so that most attempts at copy are caught at compile-time. */
-#if __cplusplus >= 201103
+#if defined(__cplusplus) && __cplusplus >= 201103
#define DISABLE_COPY_AND_ASSIGN(TYPE) \
TYPE (const TYPE&) = delete; \
void operator= (const TYPE &) = delete
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