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Add install instructions for OS X 10.8.

Add install instructions for OS X 10.8. The 10.6 instructions did not
work for me; `configure` indicated it did not detect a C++11 compiler,
which is nonsense, because Clang 3.4svn is C++11 compliant.

The problem appears to be in linking. If the "-stdlib=libc++" is not
specified, then Clang links with libstdc++. Since 10.8-vintage XCode
ships with a gcc 4.2-vintage version of libstdc++ that is not C++11
compliant, configure does not detect a C++11 compliant compiler.
Forcing Clang to link with libc++, which is C++11 compliant,
resolves the issue.
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goxberry committed Jul 23, 2015
1 parent 776f8f5 commit c622e8a047c48b57d6527b59e5453fee6322d9af
Showing with 14 additions and 0 deletions.
  1. +14 −0 INSTALL
@@ -201,5 +201,19 @@ export CPPFLAGS="-I/bgsys/drivers/ppcfloor/arch/include"
./configure MPICC=/usr/bin/mpicc MPICXX=/usr/bin/mpicxx
o Macintosh Darwin 10.8, mountain lion
Tested with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
Set the following system variables
export OMPI_CC=/usr/bin/clang
export OMPI_CXX=/usr/bin/clang++
./configure MPICC=/usr/bin/mpicc MPICXX=/usr/bin/mpicxx \
LIBS="/System/Library/Frameworks/vecLib.framework/vecLib" \
CPPFLAGS="-I/System/Library/Frameworks/vecLib.framework/Headers" \
CXXFLAGS="-std=c++11 -stdlib=libc++"
o On x86 without SSE3 -- configure with the option CPPFLAGS="-DDISABLE_SSE3", requires autoconf-2.65+, automake-1.11+

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