Bill Hart wrote:
Sorry, I meant it was the rootrem code that fails.
http://trac.mpir.org/mpir_trac/ticket/291 (I believe the information
about it being a misexpansion of MPN_ZERO is incorrect -- it was much
more fundamental, affecting simple for loops)
http://us.generation-nt.com/answer/bug-524472-gcc-4-3-gcc-4-3-2-miscompiles-gmp-4-3-0-help-168491181.html
Ad-free:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=524472
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36765
Note that apparently *FSF* GCC 4.3.2 isn't affected, it's just Debian's.
-leif
On 9 May 2012 11:18, Bill Hart<goodwillh...@googlemail.com> wrote:
The test that often fails is the (extended) gcd one. However, it is
unsafe to run MPIR with this gcc unpatched, even if the test code
passes, as wrong answers may be returned. It's a long time ago, but as
I recall, certain for loops in MPIR compiled incorrectly. This wasn't
a preparser problem, so all attempts to replace the code with
something alternative that worked, failed. Of course it would also
have meant analysing and rewriting whole swathes of MPIR even if we
did find a way to work around it.
We didn't add a test for this to MPIR's test suite. But I have no idea
why the existing test suite doesn't fail for you. It certainly did on
the x86_64 machines I tried.
As noted, the problem also affects GMP.
Bill.
On 9 May 2012 09:14, Jeroen Demeyer<jdeme...@cage.ugent.be> wrote:
On 2012-05-09 10:05, Jason Moxham wrote:
So what's the motivation for refusing to build MPIR with gcc-4.3.2?
The configure script essentially just says "it's broken" without
specifying how or why. I have built MPIR with gcc-4.3.2 on a GNU/Linux
x86_64 system with -march=nocona and built gcc with that MPIR and I had
no problems at all.
-------------------------------------------------
gcc-4.3.2 fails MPIR's make check on x64 , I think it's the reuse test , I
suppose we should write a proper test so patched gcc's will work , but I'm not
at all sure what part of gcc is broken as we can't use the reuse test itself as
it needs MPIR to be built first. Note GMP is also broken on gcc-4.3.2
Sorry, I should have mentioned that I did run the testsuite with
gcc-4.3.2 and all tests passed. So if there really is a problem with
gcc-4.3.2, the testsuite of MPIR-2.4.0 doesn't catch it.
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