patch applied (testsuite): Fix #5003, test 4038 (ghci) fails on OS X 64 bit.
igloo at earth.li
Thu Mar 24 19:43:14 CET 2011
Thu Mar 24 10:07:05 PDT 2011 gwright at antiope.com
* Fix #5003, test 4038 (ghci) fails on OS X 64 bit.
The underlying problem in ticket #5003 is not in ghc, but rather
that the test condition runs off the end of the C stack on 64 bit
Test 4038 does a recursive call of a simple external function.
Each invocation of the function allocates a bit over 16 kB of C stack
on a 64 bit processor (half as much on a 32 bit processor). The
typical C stack on a unix system is 8 MB, so after no more than
about 500 nested calls the stack pointer will move past the end
of the allocated stack and cause a segfault.
The fix is to not call the function as many times. I've made the
number of calls a constant and have added a note explaining its
With this patch test 4038 passes consistently on OS X 64 bit.
M ./tests/ghc-regress/ffi/should_run/4038.hs -1 +18
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