Hi,
I just have the simple lex program
%%
. ECHO;
%%
int main()
{
yylex();
}
i did this, lex sample.l, which resulted in lex.yy.c then i tried to
complie the produced c file, on which i get the following error,
/tmp/ccYMo5KN.o: In function `yylex':
/tmp/ccYMo5KN.o(.text+0x353): undefined reference to `yywrap'
/tmp/ccYMo5KN.o: In function `input':
/tmp/ccYMo5KN.o(.text+0xb1a): undefined reference to `yywrap'
collect2: ld returned 1 exit status
Only way i have worked out is to have my own yywrap() function which
returns 1 always, but having said iam not able to understand the cause
of the problem, a simple lex program should work, like the following
%%
.. ECHO;
%%
but why isn't? 2 13550 sa*****@yahoo.co.in wrote: Hi, I just have the simple lex program %% . ECHO; %% int main() { yylex(); }
i did this, lex sample.l, which resulted in lex.yy.c then i tried to complie the produced c file, on which i get the following error,
/tmp/ccYMo5KN.o: In function `yylex': /tmp/ccYMo5KN.o(.text+0x353): undefined reference to `yywrap' /tmp/ccYMo5KN.o: In function `input': /tmp/ccYMo5KN.o(.text+0xb1a): undefined reference to `yywrap' collect2: ld returned 1 exit status
Only way i have worked out is to have my own yywrap() function which returns 1 always, but having said iam not able to understand the cause of the problem, a simple lex program should work, like the following %% . ECHO; %%
but why isn't?
This is not a good place to ask this question, as it deals only with
standard C. Ask either in comp.compilers or a group specific to your
tools, which you've not specified.
<sa*****@yahoo.co.in> wrote in message
news:11**********************@i39g2000cwa.googlegr oups.com... Hi, I just have the simple lex program %% . ECHO; %% int main() { yylex(); }
i did this, lex sample.l, which resulted in lex.yy.c then i tried to complie the produced c file, on which i get the following error,
/tmp/ccYMo5KN.o: In function `yylex': /tmp/ccYMo5KN.o(.text+0x353): undefined reference to `yywrap' /tmp/ccYMo5KN.o: In function `input': /tmp/ccYMo5KN.o(.text+0xb1a): undefined reference to `yywrap' collect2: ld returned 1 exit status
Only way i have worked out is to have my own yywrap() function which returns 1 always, but having said iam not able to understand the cause of the problem, a simple lex program should work, like the following %% . ECHO; %%
but why isn't?
You're missing an '%option noyywrap'. You usually need a yywrap() function.
So, I'd recommend adding one for now:
int yywrap()
{
return(1);
} http://www.gnu.org/software/flex/man...mono/flex.html This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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