| 1 | /* Provide support for both ANSI and non-ANSI environments. */ |
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| 2 | |
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| 3 | /* To get a strict ANSI C environment, define macro __STRICT_ANSI__. This will |
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| 4 | "comment out" the non-ANSI parts of the ANSI header files (non-ANSI header |
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| 5 | files aren't affected). */ |
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| 6 | |
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| 7 | #ifndef _ANSIDECL_H_ |
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| 8 | #define _ANSIDECL_H_ |
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| 9 | |
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| 10 | #include <newlib.h> |
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| 11 | #include <sys/config.h> |
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| 12 | |
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| 13 | /* ISO C++. */ |
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| 14 | |
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| 15 | #ifdef __cplusplus |
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| 16 | #if !(defined(_BEGIN_STD_C) && defined(_END_STD_C)) |
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| 17 | #ifdef _HAVE_STD_CXX |
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| 18 | #define _BEGIN_STD_C namespace std { extern "C" { |
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| 19 | #define _END_STD_C } } |
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| 20 | #else |
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| 21 | #define _BEGIN_STD_C extern "C" { |
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| 22 | #define _END_STD_C } |
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| 23 | #endif |
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| 24 | #if __GNUC_PREREQ (3, 3) |
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| 25 | #define _NOTHROW __attribute__ ((__nothrow__)) |
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| 26 | #else |
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| 27 | #define _NOTHROW throw() |
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| 28 | #endif |
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| 29 | #endif |
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| 30 | #else |
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| 31 | #define _BEGIN_STD_C |
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| 32 | #define _END_STD_C |
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| 33 | #define _NOTHROW |
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| 34 | #endif |
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| 35 | |
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| 36 | #ifndef _LONG_DOUBLE |
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| 37 | #define _LONG_DOUBLE long double |
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| 38 | #endif |
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| 39 | |
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| 40 | /* Support gcc's __attribute__ facility. */ |
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| 41 | |
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| 42 | #ifdef __GNUC__ |
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| 43 | #define _ATTRIBUTE(attrs) __attribute__ (attrs) |
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| 44 | #else |
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| 45 | #define _ATTRIBUTE(attrs) |
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| 46 | #endif |
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| 47 | |
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| 48 | /* The traditional meaning of 'extern inline' for GCC is not |
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| 49 | to emit the function body unless the address is explicitly |
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| 50 | taken. However this behaviour is changing to match the C99 |
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| 51 | standard, which uses 'extern inline' to indicate that the |
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| 52 | function body *must* be emitted. Likewise, a function declared |
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| 53 | without either 'extern' or 'static' defaults to extern linkage |
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| 54 | (C99 6.2.2p5), and the compiler may choose whether to use the |
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| 55 | inline version or call the extern linkage version (6.7.4p6). |
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| 56 | If we are using GCC, but do not have the new behaviour, we need |
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| 57 | to use extern inline; if we are using a new GCC with the |
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| 58 | C99-compatible behaviour, or a non-GCC compiler (which we will |
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| 59 | have to hope is C99, since there is no other way to achieve the |
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| 60 | effect of omitting the function if it isn't referenced) we use |
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| 61 | 'static inline', which c99 defines to mean more-or-less the same |
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| 62 | as the Gnu C 'extern inline'. */ |
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| 63 | #if defined(__GNUC__) && !defined(__GNUC_STDC_INLINE__) |
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| 64 | /* We're using GCC, but without the new C99-compatible behaviour. */ |
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| 65 | #define _ELIDABLE_INLINE extern __inline__ _ATTRIBUTE ((__always_inline__)) |
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| 66 | #else |
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| 67 | /* We're using GCC in C99 mode, or an unknown compiler which |
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| 68 | we just have to hope obeys the C99 semantics of inline. */ |
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| 69 | #define _ELIDABLE_INLINE static __inline__ |
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| 70 | #endif |
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| 71 | |
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| 72 | #if __GNUC_PREREQ (3, 1) |
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| 73 | #define _NOINLINE __attribute__ ((__noinline__)) |
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| 74 | #define _NOINLINE_STATIC _NOINLINE static |
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| 75 | #else |
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| 76 | /* On non-GNU compilers and GCC prior to version 3.1 the compiler can't be |
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| 77 | trusted not to inline if it is static. */ |
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| 78 | #define _NOINLINE |
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| 79 | #define _NOINLINE_STATIC |
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| 80 | #endif |
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| 81 | |
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| 82 | #endif /* _ANSIDECL_H_ */ |
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