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From: Szabolcs Nagy <nsz@port70.net>
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Subject: Re: compatability: bits/syscall.h requires C99
Date: Fri, 24 Aug 2012 09:53:16 +0200
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* Rich Felker <dalias@aerifal.cx> [2012-08-23 22:34:25 -0400]:
> OK, after discussion on IRC, the 2 options under consideration are:
> 
> #if __STDC_VERSION__ < 199901L && defined(__GNUC__)
> #define inline __inline
> #define restrict __restrict
> #elif __STDC_VERSION__ < 199901L
> #define inline
> #define restrict
> #endif
> 
> and
> 
> #if __STDC_VERSION__ >= 199901L
> #define __inline inline
> #define __restrict restrict
> #endif
> 
> added near the top of headers that need to use inline and/or restrict.

this won't work with c++, nor old strict c compilers
without __inline and __restrict and can break various
c parsing tools (ctags, swig, various lints, ..)

i'd use

#ifdef __cplusplus
#define __inline inline
#define __restrict
#elif __STDC_VERSION__ >= 199901L
#define __inline inline
#define __restrict restrict
#elif !defined(__GNUC__)
#define __inline
#define __restrict
#endif

so any standard c99 compiler will get the inline/restrict
(tcc, pcc, gcc -std=c99, clang -std=c99) and any gnu c
compiler will get __inline/__restrict (gcc, clang)
but other tools won't see anything