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Re: mmap checks by blacklist, not fragile AC_TRY_RUN test

Christopher Faylor <> writes:

> On Sun, Jun 01, 2003 at 09:45:03PM -0700, Zack Weinberg wrote:
>>Zack Weinberg <> writes:
>>> i686-linux bootstrap running; testing would be appreciated on
>>> blacklisted systems, and/or under the conditions that prompted the
>>> original bug reports.
>>The original patch had a pair of typos which made it think /dev/zero
>>and MAP_ANON never worked.  That caused an entertaining failure of
>>PCH; I suspect the fallback-to-fread logic has never been tested.
>>This patch has been corrected.
>>I am going to check in the change to ggc-page.c, which is independent,
>>but wait another 24 hours for more feedback on the configure changes.
>>This diff includes only the configure changes.
> I'm not sure that blacklisting cygwin re /dev/zero is correct.  It might
> have been correct at one point but recent versions may work correctly.
> Did you determine this from direct testing?

I had understood from you that the problems were unfixable.  What
happens when you run the test program from the old autoconf check on
recent cygwin?


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