[mlpack-git] master: Use CMake to figure out if we need to link against libc++ or libstdc++. (a23e498)

[gitdub at big.cc.gt.atl.ga.us]

Repository : https://github.com/mlpack/mlpack

On branch  : master
Link       : https://github.com/mlpack/mlpack/compare/06b6a04993aabe2a5ed902b6a9d35309f92d83fd...a23e498013dac6a99185fd8fd24ec859c3501975

>---------------------------------------------------------------

commit a23e498013dac6a99185fd8fd24ec859c3501975
Author: Marcus Edel <marcus.edel at fu-berlin.de>
Date:   Thu Apr 2 20:44:31 2015 +0200

    Use CMake to figure out if we need to link against libc++ or libstdc++.


>---------------------------------------------------------------

a23e498013dac6a99185fd8fd24ec859c3501975
 CMakeLists.txt | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1ef46a1..c990045 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -36,17 +36,19 @@ endif(CMAKE_COMPILER_IS_GNUCC OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
 # math.h functions, making -lm unnecessary with gcc, but it may still be
 # necessary with clang.
 if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
-  # Linking against libc++ instead of the GNU libstdc++ on OSX.
-  if(APPLE)
+  include(CheckCXXCompilerFlag)
+  CHECK_CXX_COMPILER_FLAG("-std=c++11 -stdlib=libc++" HAS_LIBCXX11)
+  # Linking against libc++ instead of the GNU libstdc++.
+  if (HAS_LIBCXX11)
     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++ -lm")
     set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -stdlib=libc++ -lm")
     set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -stdlib=libc++ -lm")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
-  else(APPLE)
+  else(HAS_LIBCXX11)
     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lstdc++ -lm")
     set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -lstdc++ -lm")
     set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -lstdc++ -lm")
-  endif(APPLE)
+  endif(HAS_LIBCXX11)
 endif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
 
 # Debugging CFLAGS.  Turn optimizations off; turn debugging symbols on.