Richard Wong flex之旅:关于undefined reference to `yywrap'错误。 当调试出现 undefined reference to `yywrap'得时候解决办法。 %option noyywrap 或者是链接时候使用-lfl参数来使用fl库中得函数。 当然也可以自己添加一个yywrap函数。返回个1就行了。 不过他默认定义这个东西意义实在不大,或许这也是侧面提醒你,手...
int yywrap(void) Called by yylex at end-of-file; the default yywrap always will return 1. If the application requires yylex to continue processing with another source of input, then the application can include a function yywrap, which associates another file with the exter- nal variable FILE ...
在FlexLexer.h中将声明改为定义：virtual int yywrap() { return 1; }
fb3-1.lex.c:(.text+0x2bd): undefined reference to `yylval' /tmp/cclBqnOk.o: In function `main': fb3-1funcs.c:(.text+0x420): undefined reference to `yyparse' collect2: ld returned 1 exit status I've got four source files: fb3-1.h: /* * Declarations for calculator fb3-1 ...
undefined reference to `yylex()' And if I make the command foralllike this: $(CPP) $^ -o $(PROGRAM) -lfl it says it couldn't find-lfl. And if I make it like this: $(CPP) $^ -o -lfl $(PROGRAM) it goes back to theundefined referenceerror. ...
/home/wine/splint-3.1.2/src/cscanner.c:2483: undefined reference to `yywrap' cscanner.o: In function `yylex': /home/wine/splint-3.1.2/src/cscanner.c:2133: undefined reference to `yywrap' collect2: ld returned 1 exit status gmake[2]: *** [splint] Error 1 ...
which avoids the need to defineyywrap %option nodefualt which will warn you if you don't have a rule for every possible input. As a final note,extern int yylineno;can't work, sinceexternmeans "this variable is defined in a different translation unit", and there is no other translation ...