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stddef: Let `offset` be defined from toolchain 

Let `offset` could be defined from toolchain,
Which will be usefull for fixed code project.
This commit is contained in:
zhuyanlin 2021-08-27 10:41:53 +08:00 committed by David Sidrane
parent f0001574ed
commit 3c58b01721
2 changed files with 24 additions and 22 deletions
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24
include/nuttx/compiler.h
View File

@ -53,6 +53,22 @@
/* Built-in functions */
/* The <stddef.h> header shall define the following macros:
*
* offsetof(type, member-designator)
* Integer constant expression of type size_t, the value of which is the
* offset in bytes to the structure member (member-designator), from the
* beginning of its structure (type).
*
* NOTE: This version of offsetof() depends on behaviors that could be
* undefined for some compilers. It would be better to use a builtin
* function if one exists.
*
* Reference: Opengroup.org
*/
# define offsetof(a, b) __builtin_offsetof(a, b)
/* GCC 4.x have __builtin_ctz(|l|ll) and __builtin_clz(|l|ll). These count
* trailing/leading zeros of input number and typically will generate few
* fast bit-counting instructions. Inputting zero to these functions is
@ -491,6 +507,8 @@
# define UNUSED(a) ((void)(1 || (a)))
# define offsetof(a, b) ((size_t)(&(((a *)(0))->b)))
/* Zilog-specific definitions ***********************************************/
#elif defined(__ZILOG__)
@ -626,6 +644,8 @@
# define UNUSED(a) ((void)(1 || (a)))
# define offsetof(a, b) ((size_t)(&(((a *)(0))->b)))
/* ICCARM-specific definitions **********************************************/
#elif defined(__ICCARM__)
@ -690,6 +710,8 @@
# undef CONFIG_HAVE_ANONYMOUS_STRUCT
# undef CONFIG_HAVE_ANONYMOUS_UNION
# define offsetof(a, b) ((size_t)(&(((a *)(0))->b)))
/* Unknown compiler *********************************************************/
#else
@ -742,6 +764,8 @@
# define UNUSED(a) ((void)(1 || (a)))
# define offsetof(a, b) ((size_t)(&(((a *)(0))->b)))
#endif
/****************************************************************************

22
include/stddef.h
View File

@ -31,28 +31,6 @@
* Pre-processor Definitions
****************************************************************************/
/* The <stddef.h> header shall define the following macros:
*
* NULL
* The null pointer constant.
*
* NOTE: Currently the definition of NULL is in sys/types.h but should
* be moved here sometime.
*
* offsetof(type, member-designator)
* Integer constant expression of type size_t, the value of which is the
* offset in bytes to the structure member (member-designator), from the
* beginning of its structure (type).
*
* NOTE: This version of offsetof() depends on behaviors that could be
* undefined for some compilers. It would be better to use a builtin
* function if one exists.
*
* Reference: Opengroup.org
*/
#define offsetof(a, b) ((size_t)(&(((a *)(0))->b)))
/****************************************************************************
* Type Definitions
****************************************************************************/