Add meson build option for ILP64

fixes compiler warning about unused function

Author: ndgrigorian

meson.build

@@ -15,6 +15,10 @@ py = import('python').find_installation(pure: false)
 
 c_args = ['-DNDEBUG']
 
+if get_option('ilp64')
+    c_args += '-DMKL_ILP64'
+endif
+
 thread_dep = dependency('threads')
 
 cc = meson.get_compiler('c')

meson.options

@@ -0,0 +1,2 @@
+option('ilp64', type: 'boolean', value: false,
+    description: 'Build with MKL ILP64 interface')

mkl/_mklinitmodule.c

@@ -28,8 +28,11 @@ static struct PyMethodDef methods[] = {{NULL, NULL, 0, NULL}};
 #define MKL_SERVICE_INLINE inline
 #endif
 
+#ifdef MKL_ILP64
 static MKL_SERVICE_INLINE void _set_mkl_ilp64(void);
+#else
 static MKL_SERVICE_INLINE void _set_mkl_lp64(void);
+#endif
 static MKL_SERVICE_INLINE void _set_mkl_interface(void);
 
 static const char *mtlayer;
@@ -154,25 +157,31 @@ static void _preload_threading_layer(void)
     return;
 }
 
+#ifdef MKL_ILP64
 static MKL_SERVICE_INLINE void _set_mkl_ilp64(void)
 {
 #ifdef USING_MKL_RT
     mkl_set_interface_layer(MKL_INTERFACE_ILP64);
 #endif
     return;
 }
-
+#else
 static MKL_SERVICE_INLINE void _set_mkl_lp64(void)
 {
 #ifdef USING_MKL_RT
     mkl_set_interface_layer(MKL_INTERFACE_LP64);
 #endif
     return;
 }
+#endif
 
 static MKL_SERVICE_INLINE void _set_mkl_interface(void)
 {
+#ifdef MKL_ILP64
+    _set_mkl_ilp64();
+#else
     _set_mkl_lp64();
+#endif
     _preload_threading_layer();
 }