problem linking program containing bison-generated parser

[Volker Wegert]

Hello, 

I'm currently trying to gain some experience with flex and bison. In one of my
projects, I'd like to use these two tools together with some Qt classes. I'm
not trying to create an object-oriented parser, I'm just using Qt's string and
list objects as I'm much more familiar with them. The idea is to feed an input
file through a bison-generated parser and create an object structure that is
processed subsequently.

However, I get the following error message during linking (output
abbreviated):

,----
| ..
| bison -y  -d -t -v CDLparse.y
| ...
| if test -f y.tab.h; then \
|   to=`echo "CDLparse_H" | sed \
|                 -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/' 
\
|                 -e 's/[^ABCDEFGHIJKLMNOPQRSTUVWXYZ]/_/g'`; \
|   sed -e "/^#/!b" -e "s/Y_TAB_H/$to/g" -e "s|y\.tab\.h|CDLparse.h|" \
|             y.tab.h >CDLparse.ht; \
|   rm -f y.tab.h; \
|   if cmp -s CDLparse.ht CDLparse.h; then \
|     rm -f CDLparse.ht ;\
|   else \
|     mv CDLparse.ht CDLparse.h; \
|   fi; \
| fi
| if test -f y.output; then \
|   mv y.output CDLparse.output; \
| fi
| sed '/^#/ s|y\.tab\.c|CDLparse.c|' y.tab.c >CDLparse.ct && mv CDLparse.ct
| CDLparse.c 
| rm -f y.tab.c
| ...
| flex  -d -s -B  CDLlex.l
| ...
| sed '/^#/ s|lex.yy\.c|CDLlex.c|' lex.yy.c >CDLlex.c
| rm -f lex.yy.c
| if gcc -DHAVE_CONFIG_H -I. -I. -I.    -DYY_NO_UNISTD_H -g -O2 -MT
| quickconfig-CDLlex.o -MD -MP -MF ".deps/quickconfig-CDLlex.Tpo" -c -o
| quickconfig-CDLlex.o `test -f 'CDLlex.c' || echo './'`CDLlex.c; \ 
| then mv -f ".deps/quickconfig-CDLlex.Tpo" ".deps/quickconfig-CDLlex.Po";
| else rm -f ".deps/quickconfig-CDLlex.Tpo"; exit 1; fi 
| ...
| if gcc -DHAVE_CONFIG_H -I. -I. -I.    -DYY_NO_UNISTD_H -g -O2 -MT
| quickconfig-CDLparse.o -MD -MP -MF ".deps/quickconfig-CDLparse.Tpo" -c -o
| quickconfig-CDLparse.o `test -f 'CDLparse.c' || echo './'`CDLparse.c; \ 
| then mv -f ".deps/quickconfig-CDLparse.Tpo" ".deps/quickconfig-CDLparse.Po";
| else rm -f ".deps/quickconfig-CDLparse.Tpo"; exit 1; fi 
| g++  -g -O2   -o quickconfig  quickconfig-quickconfig.o
| quickconfig-QCGenerator.o quickconfig-CDLlex.o quickconfig-CDLparse.o
| quickconfig-GetOpt.o -lm -lfl -L/usr/qt/3/lib -lqt -L -lXext -lX11 -lm -lSM
| -lICE -ldl -ljpeg 
| quickconfig-QCGenerator.o(.text+0xfab): In function 
`QCGenerator::parseInputFile()':
| /home/vwegert/Entwicklung/Linux/Qt/QuickConf/cvs/src/QCGenerator.cpp:145:
| undefined reference to `yyparse()' 
| collect2: ld returned 1 exit status
`----

However, readelf -s quickconfig-CDLparse.o returns

,----
| Symbol table '.symtab' contains 51 entries:
|    Num:    Value  Size Type    Bind   Vis      Ndx Name
|      0: 00000000     0 NOTYPE  LOCAL  DEFAULT  UND 
|      1: 00000000     0 FILE    LOCAL  DEFAULT  ABS CDLparse.c
|      2: 00000000     0 SECTION LOCAL  DEFAULT    1 
|      3: 00000000     0 SECTION LOCAL  DEFAULT    3 
|      4: 00000000     0 SECTION LOCAL  DEFAULT    4 
|      5: 00000000     0 SECTION LOCAL  DEFAULT    5 
|      6: 00000000     0 SECTION LOCAL  DEFAULT    6 
|      7: 00000000     0 SECTION LOCAL  DEFAULT    8 
|      8: 00000000     0 SECTION LOCAL  DEFAULT   10 
|      9: 00000000   303 OBJECT  LOCAL  DEFAULT   10 yytranslate
|     10: 00000140    70 OBJECT  LOCAL  DEFAULT   10 yyprhs
|     11: 000001a0   190 OBJECT  LOCAL  DEFAULT   10 yyrhs
|     12: 00000260    70 OBJECT  LOCAL  DEFAULT   10 yyrline
|     13: 00000000     0 SECTION LOCAL  DEFAULT   12 
|     14: 000002c0   368 OBJECT  LOCAL  DEFAULT   10 yytname
|     15: 00000440    70 OBJECT  LOCAL  DEFAULT   10 yyr1
|     16: 000004a0    70 OBJECT  LOCAL  DEFAULT   10 yyr2
|     17: 00000500   113 OBJECT  LOCAL  DEFAULT   10 yydefact
|     18: 00000580    43 OBJECT  LOCAL  DEFAULT   10 yydefgoto
|     19: 000005c0   113 OBJECT  LOCAL  DEFAULT   10 yypact
|     20: 00000640    43 OBJECT  LOCAL  DEFAULT   10 yypgoto
|     21: 00000680    97 OBJECT  LOCAL  DEFAULT   10 yytable
|     22: 00000700    97 OBJECT  LOCAL  DEFAULT   10 yycheck
|     23: 00000780   113 OBJECT  LOCAL  DEFAULT   10 yystos
|     24: 00000000   121 FUNC    LOCAL  DEFAULT    1 yy_stack_print
|     25: 00000000     0 SECTION LOCAL  DEFAULT   13 
|     26: 00000080   175 FUNC    LOCAL  DEFAULT    1 yy_reduce_print
|     27: 00000130    87 FUNC    LOCAL  DEFAULT    1 yysymprint
|     28: 00000190     5 FUNC    LOCAL  DEFAULT    1 yydestruct
|     29: 00000000     0 SECTION LOCAL  DEFAULT   14 
|     30: 00000000     0 SECTION LOCAL  DEFAULT   16 
|     31: 00000000     0 SECTION LOCAL  DEFAULT   18 
|     32: 00000000     0 SECTION LOCAL  DEFAULT   20 
|     33: 00000000     0 SECTION LOCAL  DEFAULT   21 
|     34: 00000000     0 SECTION LOCAL  DEFAULT   22 
|     35: 00000000     0 SECTION LOCAL  DEFAULT   23 
|     36: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND stderr
|     37: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND fwrite
|     38: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND fputc
|     39: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND fprintf
|     40: 000001a0  2092 FUNC    GLOBAL DEFAULT    1 yyparse
|     41: 00000004     4 OBJECT  GLOBAL DEFAULT  COM yydebug
|     42: 00000004     4 OBJECT  GLOBAL DEFAULT  COM yynerrs
|     43: 00000004     4 OBJECT  GLOBAL DEFAULT  COM yychar
|     44: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND memcpy
|     45: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND identifier
|     46: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND printf
|     47: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND puts
|     48: 00000004     4 OBJECT  GLOBAL DEFAULT  COM yylval
|     49: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND yyerror
|     50: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND yylex
`----

So as far as I can see, the function yylex() should be present. Can anybody
tell me what's going wrong here?

Thanks in advance
  Volker

-- 
* Volker Wegert * http://www.volker-wegert.de/contact *
* "Menschen und Völker handeln erst dann vernünftig, wenn alle anderen
* Möglichkeiten erschöpft sind." (Abba Solomon Eban)  
*