wordsize.h

来自「glibc 库, 不仅可以学习使用库函数,还可以学习函数的具体实现,是提高功力的」· C头文件 代码 · 共 19 行

/* Determine the wordsize from the preprocessor defines.  */

#if defined __s390x__
# define __WORDSIZE	64
#else
# define __WORDSIZE	32
#endif

#if !defined __NO_LONG_DOUBLE_MATH && !defined __LONG_DOUBLE_MATH_OPTIONAL

/* Signal that we didn't used to have a `long double'. The changes all
   the `long double' function variants to be redirects to the double
   functions.  */
# define __LONG_DOUBLE_MATH_OPTIONAL   1
# ifndef __LONG_DOUBLE_128__
#  define __NO_LONG_DOUBLE_MATH        1
# endif
#endif