[7041] in Athena Bugs
PS2 7.1K lex generates bad code (wants _Const)
daemon@ATHENA.MIT.EDU (daemon@ATHENA.MIT.EDU)
Mon Feb 4 16:38:49 1991
From: epeisach@ATHENA.MIT.EDU
Date: Mon, 4 Feb 91 16:42:08 EST
To: bugs@ATHENA.MIT.EDU
Cc: bug-ps2@ATHENA.MIT.EDU
In trying to compile some code that used lex, I discovered that lex on
the PS/2 generates code that looks like
_Const int foo;
_Const is not defined in any default header files or any system header file.
Fix: compile as follows:
cc lex.yy.c -D_Const= -ll
Ugly but works. - either that or change:
>>>> /usr/lib/lex/ncform to not have the bogus _Const definition..
Sample lex file: (Snarfed from nutworks book on lex/yacc)
%{
#define NUMBER 400
#define COMMENT 401
#define TEXT 402
#define COMMAND 403
%}
%%
[ \t]+ ;
[0-9]+ |
[0-9]+\.[0-9]+ |
\.[0-9]+ { return NUMBER; }
#* { return COMMENT; }
\"[^\"\n]*\" { return TEXT; }
[a-zA-Z][a-zA-Z0-9]+ { return COMMAND; }
\n { return '\n'; }
. { return yytext[0]; }
%%
#include <stdio.h>
main(argc,argv)
int argc;
char *argv[];
{
int val;
while(val = yylex()) printf("value is %d\n",val);
}
