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cdefs.h: Allow __CONCAT() macro to be nested

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This commit is contained in:
Arun Thomas 2010-08-30 14:34:58 +00:00
parent a4c30acd9d
commit 36fb30dfef
1 changed files with 7 additions and 4 deletions
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11
include/sys/cdefs.h
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@ -78,9 +78,11 @@
/* /*
* The __CONCAT macro is used to concatenate parts of symbol names, e.g. * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
* with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo. * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
* The __CONCAT macro is a bit tricky -- make sure you don't put spaces * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
* in between its arguments. __CONCAT can also concatenate double-quoted * mode -- there must be no spaces between its arguments, and for nested
* strings produced by the __STRING macro, but this only works with ANSI C. * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
* concatenate double-quoted strings produced by the __STRING macro, but
* this only works with ANSI C.
*/ */
#define ___STRING(x) __STRING(x) #define ___STRING(x) __STRING(x)
@ -88,7 +90,8 @@
#if __STDC__ || defined(__cplusplus) #if __STDC__ || defined(__cplusplus)
#define __P(protos) protos /* full-blown ANSI C */ #define __P(protos) protos /* full-blown ANSI C */
#define __CONCAT(x,y) x ## y #define __CONCAT1(x,y) x ## y
#define __CONCAT(x,y) __CONCAT1(x,y)
#define __STRING(x) #x #define __STRING(x) #x
#define __const const /* define reserved names to standard */ #define __const const /* define reserved names to standard */