help

[Aravind Thangavel]

i'm trying to compile a really old c++ code. In which there is a bison
command

bison -d -b exp  -t exp.yacc

generating a file

exp.tab.cacc
exp.tab.hacc

But the next command is this

mv exp.tab.c exp.tab.cc

Generating an error exp.tab.c does not exists.

So what is the solution?