Broad valgrind run

[Torbjörn Granlund]

tg at gmplib.org (Torbjörn Granlund) writes:

  I decided to test running the nightly GMP runs under valgrind.  We've
  run valgrind manually for many configurations, but never over the entire
  set if test configurations.
  
  I expect https://gmplib.org/devel/tm-date.html to have a few spurious
  failures, but let's be prepared for some genuine failures too.  The
  first valgrind reports will arrive next night.

Time for some conclusions.

Valgrind doesn't run on all relevant machines, and I needed to manually
install the latest version on some machines where it would install.
Existing valgrind installs did not support all instructions we use in
GMP.

One real problem was found in GMP, affecting 32-bit powerpc.  We used to
store things below the stack pointer, which is not allowed for all ABIs.
We still do that for 64-bit powerpc, since I believe we there follow the
ABIs.

We're now back to plain builds.

-- 
Torbjörn
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