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-ly Yacc library for Linux

Posted on 1998-02-13
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Last Modified: 2013-12-26
I've installed a new version of Suse Linux, but I cant find the -ly library which is nessesary for the gcc compiler to compile the yacc-generated yyparse and my parser.
My Question:
-Is the library on the distribution, but on another directory?
-Is the -ly library in the Internet?
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Question by:bodirsky
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ahoffmann earned 100 total points
ID: 1295995
Linux uses bison instead of yacc, usually.
Bison doesn't need a library ;-)

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Author Comment

by:bodirsky
ID: 1295996
But why gcc doesn't like my parser-routines any more?? In spite of upward-compability there are a lot of warnings and errors.
what is the equivalent for
lex lexfile
yacc yaccfile
gcc parser.c -ly
?
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LVL 51

Expert Comment

by:ahoffmann
ID: 1295997
What do you mean  with:
  "gcc doesn't like my parser-routine"
Do you get compiler or linker errors?

lex lexfile       --> flex lexfile
yacc yaccfile     --> bison yaccfile
gcc parser.c -ly  --> gcc parser.c

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Author Comment

by:bodirsky
ID: 1295998
In file included from bisoncomp.c:53:
lex.yy.c:267: conflicting types for `yytext'
ottersyntax.y:1: previous declaration of `yytext'
ottersyntax.l: In function `yylex':
In file included from bisoncomp.c:53:
ottersyntax.l:16: stray '\' in program
ottersyntax.l:16: parse error before `|'
ottersyntax.l:16: parse error before `['
ottersyntax.l:17: `i' undeclared (first use this function)
ottersyntax.l:17: (Each undeclared identifier is reported only once
ottersyntax.l:17: for each function it appears in.)
ottersyntax.l:19: break statement not within loop or switch
ottersyntax.l:20: case label not within a switch statement
ottersyntax.l: At top level:
ottersyntax.l:21: parse error before string constant
ottersyntax.l:21: stray '\' in program
lex.yy.c:752: warning: initialization makes pointer from integer without a cast
lex.yy.c:752: initializer element is not constant
lex.yy.c:752: warning: data definition has no type or storage class
lex.yy.c:755: parse error before `if'
lex.yy.c:782: conflicting types for `yy_c_buf_p'
lex.yy.c:219: previous declaration of

And so on without an end.

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LVL 51

Expert Comment

by:ahoffmann
ID: 1295999
> lex.yy.c:267: conflicting types for `yytext'
> ottersyntax.y:1: previous declaration of `yytext'

I assume you have

  #include "lex.yy.c"

in ottersyntax.y , right?
If you combine flex and bison files, you need to have a common header file which defines yytext, for example.
I.g. this will be extracted from your tokens and defines in the .y file with
  bison -d
please refer to  man bison.

I'm not shure about
 > ottersyntax.l:16: stray '\' in program
sounds, that there is a \ which should be quoted.
PLease remove these 2, then compile again.

Flex/bison are much more flexible than lex/yacc. Most names, defines etc. are configurable (of cause most have usefull defaults, but unfortunately these defaults may be the source of you problem).
IMHO, you need to read man-pages (flex and bison). It's hard staff, but once you get used to it, you'll never use lex/yacc again :-)).

Feel free for more questions.
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