toolchain-gcc-arm-embedded/arm-none-eabi/include/_ansi.h

/* Provide support for both ANSI and non-ANSI environments.  */

/* To get a strict ANSI C environment, define macro __STRICT_ANSI__.  This will
   "comment out" the non-ANSI parts of the ANSI header files (non-ANSI header
   files aren't affected).  */

#ifndef	_ANSIDECL_H_
#define	_ANSIDECL_H_

#include <newlib.h>
#include <sys/config.h>

/*  ISO C++.  */

#ifdef __cplusplus
#if !(defined(_BEGIN_STD_C) && defined(_END_STD_C))
#ifdef _HAVE_STD_CXX
#define _BEGIN_STD_C namespace std { extern "C" {
#define _END_STD_C  } }
#else
#define _BEGIN_STD_C extern "C" {
#define _END_STD_C  }
#endif
#if __GNUC_PREREQ (3, 3)
#define _NOTHROW __attribute__ ((__nothrow__))
#else
#define _NOTHROW throw()
#endif
#endif
#else
#define _BEGIN_STD_C
#define _END_STD_C
#define _NOTHROW
#endif

#ifndef _LONG_DOUBLE
#define _LONG_DOUBLE long double
#endif

/* Support gcc's __attribute__ facility.  */

#ifdef __GNUC__
#define _ATTRIBUTE(attrs) __attribute__ (attrs)
#else
#define _ATTRIBUTE(attrs)
#endif

/*  The traditional meaning of 'extern inline' for GCC is not
  to emit the function body unless the address is explicitly
  taken.  However this behaviour is changing to match the C99
  standard, which uses 'extern inline' to indicate that the
  function body *must* be emitted.  Likewise, a function declared
  without either 'extern' or 'static' defaults to extern linkage
  (C99 6.2.2p5), and the compiler may choose whether to use the
  inline version or call the extern linkage version (6.7.4p6).
  If we are using GCC, but do not have the new behaviour, we need
  to use extern inline; if we are using a new GCC with the
  C99-compatible behaviour, or a non-GCC compiler (which we will
  have to hope is C99, since there is no other way to achieve the
  effect of omitting the function if it isn't referenced) we use
  'static inline', which c99 defines to mean more-or-less the same
  as the Gnu C 'extern inline'.  */
#if defined(__GNUC__) && !defined(__GNUC_STDC_INLINE__)
/* We're using GCC, but without the new C99-compatible behaviour.  */
#define _ELIDABLE_INLINE extern __inline__ _ATTRIBUTE ((__always_inline__))
#else
/* We're using GCC in C99 mode, or an unknown compiler which
  we just have to hope obeys the C99 semantics of inline.  */
#define _ELIDABLE_INLINE static __inline__
#endif

#if __GNUC_PREREQ (3, 1)
#define _NOINLINE		__attribute__ ((__noinline__))
#define _NOINLINE_STATIC	_NOINLINE static
#else
/* On non-GNU compilers and GCC prior to version 3.1 the compiler can't be
   trusted not to inline if it is static. */
#define _NOINLINE
#define _NOINLINE_STATIC
#endif

#endif /* _ANSIDECL_H_ */