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Re: OT: converting C to C++ : linkng problems

What version of Bison are you using? Bison just introduced recently C++
support. You need to select the C++ skeleton. See
for details or asked The Bison mailing list (help-bison@gnu.org) for help.

> Hello,
> Sorry for offtopic-posting but I wouldn't directly know where to ask
> elsewhere...
> I'd like to ask this question: in some project I try to switch from C to
> C++ , in order to refactor/learn C++ constructs (that is, classes,
> inheritance, and such) better
> There is this problem: it doesn't link correctly; I get link errors such
> like this:
> rm -f lex.yy.cc y.tab.* y.output *.o \
>      `find . -name core -o -name \*\.bak` \
>      democomp toc \
>      test-runs-log
> bison --yacc --defines --debug --verbose spascal.y -o y.tab.cc
> g++   -Wall  -g -ggdb    -c y.tab.cc -o y.tab.o
> flex --c++  spascal.l
> sed -i -e 's/extern "C" int isatty (int );/extern "C" int isatty (int)
> throw();/g' lex.yy.cc
> g++   -Wall  -g -ggdb    -c lex.yy.cc -o lex.yy.o
> <snip ... compiling all .cc files using g++ >
> g++   -g -o democomp y.tab.o lex.yy.o debug.o list.o symbol.o syntax.o
> parser.o intermediate.o register.o flowgraph.o dag.o optimize.o
> inttomips.o mips.o -lfl
> y.tab.o(.text+0x46a): In function `yyparse()':
> /home/jorishuizer/zooi/coco3-hack/y.tab.cc:1105: undefined reference to
> `yylex()'
> y.tab.o(.text+0x6dd): In function `yyparse()':
> /home/jorishuizer/zooi/coco3-hack/spascal.y:116: undefined reference to
> `selectEndOfTable'
> <snip ... lots of these >
> Symbols in two files are not found: those in symbol.cc and those in
> lex.yy.cc (generated with flex)
> does someone have any ideas?
> --
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