[llvm-commits] [PATCH] GetPageSize on Cygwin

[Jay Foad]

See this discussion:

http://www.cygwin.com/ml/cygwin/2009-01/threads.html#00492

On Cygwin, getpagesize() returns 64k, but the page size for the
purposes of memory protection and mmap() is really 4k. An unpleasant
effect of this is that LLVM tools can crash on Cygwin if you give them
an input file that happens to be a multiple of 4k (but not a multiple
of 64k) in size:

$ dd bs=68K count=1 if=/dev/random of=x.bc
1+0 records in
1+0 records out
69632 bytes (70 kB) copied, 0.012 s, 5.8 MB/s

$ ./llc x.bc
Stack dump:
0.      Program arguments: ./llc x.bc
      4 [main] llc 496 _cygtls::handle_exceptions: Error while dumping state (pr
obably corrupted stack)
Segmentation fault (core dumped)


The attached patch bodges sys::Process::GetPageSize() for Cygwin. OK to apply?

Thanks,
Jay.
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