Date: Fri, 03 Jan 2014 17:53:02 +0100 From: Torbjorn Granlund <tg@gmplib.org> To: freebsd-ports@freebsd.org Subject: Advice about /usr/ports/math/gmp Message-ID: <86d2k9uhw1.fsf@shell.gmplib.org>
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We are about to release GMP 5.2.
We have been forced to add three FreeBSD-related items to the releases
notes:
* This release will not work on FreeBSD/amd64 7.x, 8.x or 9 series
before 9.3 with a Haswell CPU or any other CPU which supports the
BMI2 instructions. The reason is that the FreeBSD m4 command is not
correctly implemented. (Workaround: Use an older GMP release, or
install GNU m4 from /usr/ports and tell GMP to use it.)
* This release will not work on FreeBSD/amd64 before version 10 using
the 32-bit ABI. The reason is broken limits.h and broken dynamic
linking. (Workaround: Use an older GMP release if using the 32-bit
ABI on these FreeBSD releases is important.)
* This release will not work on FreeBSD/amd64 10.0 using the 32-bit
ABI. The reason is bugs in the compiler 'clang'. (Workaround:
Compiling gcc from /usr/ports might work, except that gcc depends on
GMP; we have not been able to test that workaround since
FreeBSD/i386 10.0 does not work for us under KVM or Xen.)
The first item is a show-stopper. It would be possible to implement a
workaround in GMP. We choose not to do that since (1) we adviced the
FreeBSD project two years ago the m4 bug, and FreeBSD chose to make 4
releases without fixing m4, and (2) the fix is ugly, and (3) our use of
m4 which triggers the bug is actually part of a workaround for a broken
assembler (to much complexity to maintain workarounds for workarounds).
The second item should not affect /usr/ports builds since they would use
the default 64-bit ABI on amd64 machines.
The third item is a show-stopper until clang is fixed. We have not been
able to isolate this problem due to lack of time and due to a deeply
malfunctioning filesystem of FreeBSD/i386 under KVM and Xen+NetBSD. We
don't have any more information about these bugs.
We do not plan to implement workarounds for the above bugs for GMP 5.2.x
for any x. I would advice that you stick with GMP 5.1.3.
Torbj=C3=B6rn
Please encrypt, key id 0xC8601622
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