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Bootstrapping on DEC Unix


I've seen several reports on this list of "virtual memory exhausted"
when trying to bootstrap gcc on DEC Unix 4.0x and 3.2x.

I also get this error and after some investigation have concluded it is
probably due to a broken mmap() function. 

Gcc bootstraps fine with --with-gc=simple and also fine with --with-gc=page
if the HAVE_MMAP* macros are commented out in auto-host.h.


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