ENH: add objc and objcpp to the $ARCHFLAGS generated cross file

Allows $ARCHFLAGS enabled cross compilation of objc and objcpp.

Fixes #468.

Author: dnicolodi

mesonpy/__init__.py

@@ -650,6 +650,8 @@ def __init__(  # noqa: C901
                         [binaries]
                         c = ['cc', '-arch', {arch!r}]
                         cpp = ['c++', '-arch', {arch!r}]
+                        objc = ['cc', '-arch', {arch!r}]
+                        objcpp = ['c++', '-arch', {arch!r}]
                         [host_machine]
                         system = 'darwin'
                         cpu = {arch!r}