Fixes Cython compilation on Mac OS X

GPy/kern/_src/stationary_utils.h

@@ -1,3 +1,5 @@
+#ifndef __APPLE__
 #include <omp.h>
+#endif
 void _grad_X(int N, int D, int M, double*X, double* X2, double* tmp, double* grad);
 void _lengthscale_grads(int N, int D, int M, double* X, double* X2, double* tmp, double* grad);

setup.py

@@ -12,18 +12,31 @@ version = '0.6.1'
 def read(fname):
     return open(os.path.join(os.path.dirname(__file__), fname)).read()
 
-#compile_flags = ["-march=native", '-fopenmp', '-O3', ]
-compile_flags = [ '-fopenmp', '-O3', ]
+#Mac OS X Clang doesn't support OpenMP th the current time.
+#This detects if we are building on a Mac
+def ismac():
+    platform = sys.platform
+    ismac = False
+    if platform[:6] == 'darwin':
+        ismac = True
+    return ismac
+
+if ismac():
+    compile_flags = [ '-O3', ]
+    link_args = ['']
+else:
+    compile_flags = [ '-fopenmp', '-O3', ]
+    link_args = ['-lgomp']
 
 ext_mods = [Extension(name='GPy.kern._src.stationary_cython',
                       sources=['GPy/kern/_src/stationary_cython.c','GPy/kern/_src/stationary_utils.c'],
                       include_dirs=[np.get_include()],
                       extra_compile_args=compile_flags,
-                      extra_link_args = ['-lgomp']),
+                      extra_link_args = link_args),
             Extension(name='GPy.util.choleskies_cython',
                       sources=['GPy/util/choleskies_cython.c'],
                       include_dirs=[np.get_include()],
-                      extra_link_args = ['-lgomp'],
+                      extra_link_args = link_args,
                       extra_compile_args=compile_flags),
             Extension(name='GPy.util.linalg_cython',
                       sources=['GPy/util/linalg_cython.c'],