gmp 4.3.2 regressions when compiled with llvm-gcc

[Jack Howarth]

Since Apple is shifting towards llvm-gcc/clang, issues with those compilers should
be examined on darwin10. The gmp 4.3.2 build on x86_64-apple-darwin10 completes under
Xcode 4.0.1 using...

setenv CC llvm-gcc
setenv CXX llvm-g++
cd gmp-4.3.2
mkdir build
cd build
../configure --prefix=/usr ABI=64 --enable-cxx

However the make check for the build fails two test cases...

/bin/sh: line 1:  8474 Segmentation fault      ${dir}$tst
FAIL: t-hamdist

/bin/sh: line 1:  8513 Segmentation fault      ${dir}$tst
FAIL: t-popcount

These failures have been reported upstream to llvm.org as...

http://llvm.org/bugs/show_bug.cgi?id=9596

Using the prebuilt llvm-gcc-4.2 2.8 x86_64  binaries on x86_64 Fedora 14
I don't see this problem but that machine has an opteron and uses -mtune=k9
in the gmp 4.3.2 build with llvm-gcc.

The gmp 5.0.1 build also completes but the testsuite failures are somewhat
different with a hang during the make check at...

PASS: t-cdiv_ui

Both of these issues also exist with llvm-gcc-4.2 2.9 on x86_64-apple-darwin10.