liboi will not compile with Xcode 4.5

[bkloppenborg]

Report from Fabien. liboi will not compile using Xcode 4.5 on Mac OS 10.7. The version of clang that is shipped with Xcode does not appear to support the full c++11 features required for liboi.

$ clang -v      
Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin11.4.2
Thread model: posix

Compiling with clang --std=c++11 and --stdlib=libc++ gives:

[  5%] Building CXX object lib/ccoifits/src/CMakeFiles/ccoifits_static.dir/COI_ARRAY.cpp.o
In file included from /Users/fbaron/fb/liboi/lib/ccoifits/src/COI_ARRAY.cpp:8:
In file included from /Users/fbaron/fb/liboi/lib/ccoifits/src/COI_ARRAY.h:11:
/Users/fbaron/fb/liboi/lib/ccoifits/src/COI_TABLE.h:16:10: fatal error: 'array' file not found
#include <array>
         ^
1 error generated.
make[2]:  [lib/ccoifits/src/CMakeFiles/ccoifits_static.dir/COI_ARRAY.cpp.o] Error 1
make[1]:  [lib/ccoifits/src/CMakeFiles/ccoifits_static.dir/all] Error 2
make: *** [all] Error 2

Compiling with clang --std=c++11 and --stdlib=libc++ gives:

[  1%] Building CXX object lib/gtest-1.6.0/CMakeFiles/gtest.dir/src/gtest-all.cc.o
In file included from /Users/fbaron/fb/liboi/lib/gtest-1.6.0/src/gtest-all.cc:39:
In file included from /Users/fbaron/fb/liboi/lib/gtest-1.6.0/include/gtest/gtest.h:57:
In file included from /Users/fbaron/fb/liboi/lib/gtest-1.6.0/include/gtest/internal/gtest-internal.h:40:
/Users/fbaron/fb/liboi/lib/gtest-1.6.0/include/gtest/internal/gtest-port.h:499:13: fatal error: 'tr1/tuple' file not found
#   include <tr1/tuple>  // NOLINT
            ^
1 error generated.
make[2]:  [lib/gtest-1.6.0/CMakeFiles/gtest.dir/src/gtest-all.cc.o] Error 1
make[1]:  [lib/gtest-1.6.0/CMakeFiles/gtest.dir/all] Error 2
make: *** [all] Error 2

[bkloppenborg]

This is a problem with the compiler rather than with liboi. We'll attempt to find a workaround.

[bkloppenborg]

The issue causing this is related to the development status of clang. Clang 3.1x variants do not appear to have full support for the C++11 features liboi uses. The solution for now is to use the features we need from libboost rather than C++11. Once llvm-clang 3.2 is released and Apple clang / Xcode are updated, the workaround I discuss below will no longer be required.

Workaround (implemented in 18614ed8fa86d6f042c0b6e040c4c2693147c6f0): Conditionally compile and link with libboost_threads and libboost_system to get access to boost::thread, boost:mutex, boost::shared_ptr.

I have verified that the code compiles and executes correctly (via. unit tests) with llvm-clang 3.0, and boost 1.5.

[bkloppenborg]

Until Clang on Apple is updated to the latest development branch, the workaround is to use GCC 4.7x installed through macports. Documentation in the readme has been updated (thanks, Fabien!).