I wrote on 2011-04-14:
> * lib/stdio.in.h (_GL_ATTRIBUTE_FORMAT_SCANF,
> _GL_ATTRIBUTE_FORMAT_SCANF_SYSTEM): New macros.
> (fgetc, fgets, fread, fscanf, getc, getchar, gets, scanf, vfscanf,
> vscanf): New declarations.
Oops, this leads to compilation errors in C++ m
The other failure of the non-blocking I/O on pipes test on mingw is because
when read() is called on a non-blocking pipe fd with an empty buffer, it
fails with EINVAL. Whereas POSIX says that it should fail with EAGAIN.
This fixes it, by adding a 'read' module for the function read() and overrides
