100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
/* 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 __GNUC_PREREQ (3, 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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#ifndef _LONG_DOUBLE
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#define _LONG_DOUBLE long double
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#endif
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#else
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#define _LONG_DOUBLE double
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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. Likewise, a function declared
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without either 'extern' or 'static' defaults to extern linkage
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(C99 6.2.2p5), and the compiler may choose whether to use the
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inline version or call the extern linkage version (6.7.4p6).
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If we are using GCC, but do not have the new behaviour, we need
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to use extern inline; if we are using a new GCC with the
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C99-compatible behaviour, or a non-GCC compiler (which we will
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have to hope is C99, since there is no other way to achieve the
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effect of omitting the function if it isn't referenced) we use
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'static inline', which c99 defines to mean more-or-less the same
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as the Gnu C '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 static __inline__
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#endif
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#if __GNUC_PREREQ (3, 1)
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#define _NOINLINE __attribute__ ((__noinline__))
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#define _NOINLINE_STATIC _NOINLINE static
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#else
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/* On non-GNU compilers and GCC prior to version 3.1 the compiler can't be
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trusted not to inline if it is static. */
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#define _NOINLINE
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#define _NOINLINE_STATIC
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#endif
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#endif /* _ANSIDECL_H_ */
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