Re: Current CVS: incorrect re-decrlaration of errno

[Werner LEMBERG]

> #include <errno.h>
> ...
> #ifndef errno
> extern int errno;
> #endif
> 
> This is plain wrong; you cannot assume that errno is #define'd. It
> is *declared* in <errno.h> and the second redeclaration fails for
> C++ (well, it may be subtle namespace problem - our compiler does
> some tricks with namespaces in standard includes).

At least for C you are wrong.  According to the ISO C standard, errno
may be a macro (and glibc indeed uses a macro).  I'll have a look into
the C++ standard, but I doubt this has changed since it would break
backwards compatibility.

Antoine, can you please comment this?


    Werner