Messages in this thread |  | | | Date | Thu, 5 Jul 2001 22:51:22 -0300 | | From | Arnaldo Carvalho de Melo <> | | Subject | Re: linux/macros.h(new) and linux/list.h(mod) ... |
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Em Fri, Jul 06, 2001 at 12:08:55AM +0100, David Woodhouse escreveu: > > #define min(a,b) __magic_minfoo(a,b, __var##__LINE__, __var2##__LINE__) > > #define __magic_minfoo(A,B,C,D) \ > ({ typeof(A) C = (A); typeof(B) D = (B); C>D?D:C; }) > > void main(void) > { > int __var11=5, __var211=7; > > printf("min(%d,%d) = %d (should be 11: %d)\n", __var11, __var211, min(__var11, __var211), __LINE__); > }
Have you looked at the preprocessor output?
[acme@brinquedo /tmp]$ gcc -E a.c -o - # or 'cpp < a.c' # 1 "a.c" void main(void) { int __var11=5, __var211=7; printf("min(%d,%d) = %d (should be 11: %d)\n", __var11, __var211, + ({ typeof( __var11 ) __var__LINE__ = ( __var11 ); typeof( __var211 ) __var2__LINE__ = ( __var211 ); __var__LINE__ > __var2__LINE__ ? __var2__LINE__ : __var__LINE__ ; }) , 11); } I didn't found a way to generate unique variable names using __LINE__
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