134 lines
4.0 KiB
C
134 lines
4.0 KiB
C
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/* Provide support for both ANSI and non-ANSI environments. */
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/* Some ANSI environments are "broken" in the sense that __STDC__ cannot be
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relied upon to have it's intended meaning. Therefore we must use our own
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concoction: _HAVE_STDC. Always use _HAVE_STDC instead of __STDC__ in newlib
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sources!
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To get a strict ANSI C environment, define macro __STRICT_ANSI__. This will
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"comment out" the non-ANSI parts of the ANSI header files (non-ANSI header
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files aren't affected). */
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#ifndef _ANSIDECL_H_
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#define _ANSIDECL_H_
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#include <newlib.h>
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#include <sys/config.h>
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/* First try to figure out whether we really are in an ANSI C environment. */
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/* FIXME: This probably needs some work. Perhaps sys/config.h can be
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prevailed upon to give us a clue. */
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#ifdef __STDC__
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#define _HAVE_STDC
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#endif
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/* ISO C++. */
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#ifdef __cplusplus
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#if !(defined(_BEGIN_STD_C) && defined(_END_STD_C))
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#ifdef _HAVE_STD_CXX
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#define _BEGIN_STD_C namespace std { extern "C" {
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#define _END_STD_C } }
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#else
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#define _BEGIN_STD_C extern "C" {
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#define _END_STD_C }
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#endif
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#if defined(__GNUC__) && \
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( (__GNUC__ >= 4) || \
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( (__GNUC__ >= 3) && defined(__GNUC_MINOR__) && (__GNUC_MINOR__ >= 3) ) )
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#define _NOTHROW __attribute__ ((nothrow))
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#else
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#define _NOTHROW throw()
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#endif
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#endif
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#else
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#define _BEGIN_STD_C
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#define _END_STD_C
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#define _NOTHROW
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#endif
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#ifdef _HAVE_STDC
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#define _PTR void *
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#define _AND ,
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#define _NOARGS void
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#define _CONST const
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#define _VOLATILE volatile
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#define _SIGNED signed
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#define _DOTS , ...
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#define _VOID void
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#ifdef __CYGWIN__
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#define _EXFUN_NOTHROW(name, proto) __cdecl name proto _NOTHROW
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#define _EXFUN(name, proto) __cdecl name proto
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#define _EXPARM(name, proto) (* __cdecl name) proto
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#define _EXFNPTR(name, proto) (__cdecl * name) proto
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#else
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#define _EXFUN_NOTHROW(name, proto) name proto _NOTHROW
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#define _EXFUN(name, proto) name proto
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#define _EXPARM(name, proto) (* name) proto
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#define _EXFNPTR(name, proto) (* name) proto
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#endif
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#define _DEFUN(name, arglist, args) name(args)
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#define _DEFUN_VOID(name) name(_NOARGS)
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#define _CAST_VOID (void)
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#ifndef _LONG_DOUBLE
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#define _LONG_DOUBLE long double
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#endif
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#ifndef _LONG_LONG_TYPE
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#define _LONG_LONG_TYPE long long
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#endif
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#ifndef _PARAMS
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#define _PARAMS(paramlist) paramlist
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#endif
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#else
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#define _PTR char *
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#define _AND ;
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#define _NOARGS
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#define _CONST
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#define _VOLATILE
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#define _SIGNED
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#define _DOTS
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#define _VOID void
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#define _EXFUN(name, proto) name()
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#define _EXFUN_NOTHROW(name, proto) name()
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#define _DEFUN(name, arglist, args) name arglist args;
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#define _DEFUN_VOID(name) name()
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#define _CAST_VOID
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#define _LONG_DOUBLE double
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#define _LONG_LONG_TYPE long
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#ifndef _PARAMS
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#define _PARAMS(paramlist) ()
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#endif
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#endif
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/* Support gcc's __attribute__ facility. */
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#ifdef __GNUC__
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#define _ATTRIBUTE(attrs) __attribute__ (attrs)
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#else
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#define _ATTRIBUTE(attrs)
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#endif
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/* The traditional meaning of 'extern inline' for GCC is not
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to emit the function body unless the address is explicitly
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taken. However this behaviour is changing to match the C99
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standard, which uses 'extern inline' to indicate that the
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function body *must* be emitted. If we are using GCC, but do
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not have the new behaviour, we need to use extern inline; if
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we are using a new GCC with the C99-compatible behaviour, or
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a non-GCC compiler (which we will have to hope is C99, since
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there is no other way to achieve the effect of omitting the
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function if it isn't referenced) we just use plain 'inline',
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which c99 defines to mean more-or-less the same as the Gnu C
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'extern inline'. */
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#if defined(__GNUC__) && !defined(__GNUC_STDC_INLINE__)
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/* We're using GCC, but without the new C99-compatible behaviour. */
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#define _ELIDABLE_INLINE extern __inline__ _ATTRIBUTE ((__always_inline__))
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#else
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/* We're using GCC in C99 mode, or an unknown compiler which
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we just have to hope obeys the C99 semantics of inline. */
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#define _ELIDABLE_INLINE __inline__
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#endif
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#endif /* _ANSIDECL_H_ */
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