error unknown type name bool

Question

I downloaded the source code and wanted to compile the file of scanner   It produces this error    meepo localhost cs143-pp1   gcc -o lex yy o lex yy c -ll In file included from scanner l 15 0  scanner h 59 5  error  unknown type name    bool    In file included from scanner l 16 0  utility h 64 38  error  unknown type name    bool    utility h 74 1  error  unknown type name    bool    In file included from scanner l 17 0  errors h 16 18  fatal error  string  No such file or directory compilation terminated    And I tried to use different complier to compile it  but it appeared different errors    meepo localhost cs143-pp1   g   -o scan lex yy c -ll  usr bin ld  cannot find -ll collect2  ld returned 1 exit status   My os is 3 0-ARCH  I don t know why this happened  How do I fix the error

User · Accepted Answer

C90 does not support the boolean data type   C99 does include it with this include    include  lt stdbool h gt

User · Answer

Just add the following    define   USE C99 MATH   include  lt stdbool h gt

User · Answer

C99 does  if you have    include  lt stdbool h gt     If the compiler does not support C99  you can define it yourself      file   myboolean h  ifndef MYBOOLEAN H  define MYBOOLEAN H   define false 0  define true 1 typedef int bool     or  define bool int   endif    but note that this definition changes ABI for bool type so linking against external libraries which were compiled with properly defined bool may cause hard-to-diagnose runtime errors

User · Answer

Somewhere in your code there is a line  include  lt string gt   This by itself tells you that the program is written in C    So using g   is better than gcc   For the missing library  you should look around in the file system if you can find a file called libl so  Use the locate command  try  usr lib   usr local lib   opt flex lib  or use the brute-force find     grep  libl   Once you have found the file  you have to add the directory to the compiler command line  for example   g   -o scan lex yy c -L opt flex lib -ll

[c] error: unknown type name ‘bool’

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