Bison-1.28 No Error Bug

[Hans Aberg]

Using the compile Bison-1.28 for MacOS using the Metrowerks CW Pro 5
C-compiler, I have noticed it Bison produces some funny error messages. For
example, if Bison cannot find the startup file "<name>.y", one gets the
somewhat confusing error message
    Bison: <name>.y: No Error

The reason, in this case, is that tryopen() uses perror() in connection
with a function fprintf() that does not set errno. When the program starts,
errno is set to 0, meaning "No Error", and remains so until a function
alters it.

  Hans Aberg