fix for #1141 - added ldflags to numpy

pythonforandroid/recipes/numpy/__init__.py

@@ -15,6 +15,36 @@ class NumpyRecipe(CompiledComponentsPythonRecipe):
                'patches/ar.patch',
                'patches/lib.patch']
 
+    def get_recipe_env(self, arch):
+        """ looks like numpy has no proper -L flags. Code copied and adapted from 
+            https://github.com/frmdstryr/p4a-numpy/
+        """
+
+        env = super(NumpyRecipe, self).get_recipe_env(arch)
+        #: Hack add path L to crystax as a CFLAG
+
+        py_ver = '3.5'
+        if {'python2crystax', 'python2'} & set(self.ctx.recipe_build_order):
+            py_ver = '2.7'
+
+        py_so = '2.7' if py_ver == '2.7' else '3.5m'
+
+        api_ver = self.ctx.android_api
+
+        platform = 'arm' if 'arm' in arch.arch else arch.arch
+        #: Not sure why but we have to inject these into the CC and LD env's for it to
+        #: use the correct arguments.
+        flags = " -L{ctx.ndk_dir}/platforms/android-{api_ver}/arch-{platform}/usr/lib/" \
+                " --sysroot={ctx.ndk_dir}/platforms/android-{api_ver}/arch-{platform}" \
+            .format(ctx=self.ctx, arch=arch, platform=platform, api_ver=api_ver,
+                    py_so=py_so, py_ver=py_ver)
+        if flags not in env['CC']:
+            env['CC'] += flags
+        if flags not in env['LD']:
+            env['LD'] += flags + ' -shared'
+
+        return env
+
     def prebuild_arch(self, arch):
         super(NumpyRecipe, self).prebuild_arch(arch)