linux - Problem with using a generated file from flex -

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I am trying to set up a project that uses Flex (fast Lex, not Adobe one). I am running on Ubuntu and I install Flex through the FT-gate system.

I have rotated the compound error and I have either found people who make their patch or have a lot of platforms where people ask and no answer.

This is my .ll file 

 % option c ++ %% %%   
 This generates a lex. Yy.cc file that I include in my main file.  
  #include "lex.yy.cc" int main () {return 0; }   
 The error I get is like many "many definitions".  
 
 lex.yy.cc | 511 | `YyFlexLexer :: yylex () '|   
 I have a Flex version of 2.5.35 and I am using the GCC compiler through Code :: Blocks Editor.  
 If I compile the main file directly through the terminal I get this.  
 
 `undefined reference =" text for itemprop    
 
 
 The problem was found! You should not include the generated file, but it must be compiled and included as an object file.  
  Flex file. G ++ -c lex.yy.cc g ++ -o key main.cpp lex.yy .o

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