diff options
Diffstat (limited to 'gcc/system.h')
| -rw-r--r-- | gcc/system.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/gcc/system.h b/gcc/system.h index d5526b2..e08c168 100644 --- a/gcc/system.h +++ b/gcc/system.h @@ -234,6 +234,26 @@ extern int errno; # endif /* defined(HOST_BITS_PER_LONG) && defined(HOST_BITS_PER_LONGLONG) */ #endif /* ! HOST_WIDEST_INT */ +/* Infrastructure for defining missing _MAX and _MIN macros. Note that + macros defined with these cannot be used in #if. */ + +/* The extra casts work around common compiler bugs. */ +#define INTTYPE_SIGNED(t) (! ((t) 0 < (t) -1)) +/* The outer cast is needed to work around a bug in Cray C 5.0.3.0. + It is necessary at least when t == time_t. */ +#define INTTYPE_MINIMUM(t) ((t) (INTTYPE_SIGNED (t) \ + ? ~ (t) 0 << (sizeof(t) * CHAR_BIT - 1) : (t) 0)) +#define INTTYPE_MAXIMUM(t) ((t) (~ (t) 0 - INTTYPE_MINIMUM (t))) + +/* Use that infrastructure to provide a few constants. */ +#ifndef UCHAR_MAX +# define UCHAR_MAX INTTYPE_MAXIMUM (unsigned char) +#endif + +#ifndef SSIZE_MAX +# define SSIZE_MAX INTTYPE_MAXIMUM (ssize_t) +#endif + #ifdef TIME_WITH_SYS_TIME # include <sys/time.h> # include <time.h> |