On 22 May 2013 13:40, Oscar Benjamin <report@bugs.python.org> wrote:
>
> However on further reflection I'm a little reluctant to force an error
> if I can't *prove* that the setup is broken.

After a little more reflection I realise that we could just do:

    if self.gcc_version < '4' or is_cygwingcc():
        # use -mno-cygwin

This way the cygwin/gcc-4 error is still emitted only if gcc emits it.
If the is_cygwingcc() function is conservative then there could be
cases where it mistakenly does not use -mno-cygwin but that would have
to be a broken cygwin/gcc-4 setup anyway.