Re: [Flex-help] Any example on how to use flex generated file?

[Peng Yu <pen...@gm...>]

On Sat, Dec 19, 2009 at 9:42 PM, Marcel Laverdet <ma...@la...> wrote:
>
>
> You'll probably want to use a compiler for that. I recommend gcc.

I knew that I should use gcc to compile .c files. But I don't find the
main() function in lex.yy.c. Here are the errors that I get. Should I
have a .c file that has the main() function to compile with lex.yy.c?

$gcc lex.yy.c
Undefined symbols:
  "_yywrap", referenced from:
      _yylex in ccMsCrId.o
      _input in ccMsCrId.o
  "_main", referenced from:
      start in crt1.10.5.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
pengy@bcm-30-165:~/morgan/test/flex$gcc --version
i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5493)
Copyright (C) 2005 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.



> On Sat, 19 Dec 2009 20:49:10 -0600, Peng Yu <pen...@gm...> wrote:
>> I try the following example to generate lex.yy.c file. But I'm not
>> sure how to use it. Could somebody give me an example main file that
>> can be used with lex.yy.c so that I can compile them to an executable?
>>
>> $cat test.yy
>> %%
>> username    printf( "%s", getlogin() );
>> $flex test.yy
>> $ls
>> lex.yy.c  test.yy
>>
>>
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>