diff options
Diffstat (limited to 'git-compat-util.h')
| -rw-r--r-- | git-compat-util.h | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/git-compat-util.h b/git-compat-util.h index ede9408bbd..86c8962966 100644 --- a/git-compat-util.h +++ b/git-compat-util.h @@ -4,10 +4,24 @@ #define _FILE_OFFSET_BITS 64 #ifndef FLEX_ARRAY -#if defined(__GNUC__) && (__GNUC__ < 3) -#define FLEX_ARRAY 0 -#else -#define FLEX_ARRAY /* empty */ +/* + * See if our compiler is known to support flexible array members. + */ +#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) +# define FLEX_ARRAY /* empty */ +#elif defined(__GNUC__) +# if (__GNUC__ >= 3) +# define FLEX_ARRAY /* empty */ +# else +# define FLEX_ARRAY 0 /* older GNU extension */ +# endif +#endif + +/* + * Otherwise, default to safer but a bit wasteful traditional style + */ +#ifndef FLEX_ARRAY +# define FLEX_ARRAY 1 #endif #endif @@ -20,6 +34,7 @@ #endif #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (sizeof(x) * 8 - (bits)))) +#define HAS_MULTI_BITS(i) ((i) & ((i) - 1)) /* checks if an integer has more than 1 bit set */ /* Approximation of the length of the decimal representation of this type. */ #define decimal_length(x) ((int)(sizeof(x) * 2.56 + 0.5) + 1) |