fix m1 not found leaf7_features (#34309)

python/paddle/fluid/core.py

@@ -92,15 +92,14 @@ def avx_supported():
                 'Can not get the AVX flag from machdep.cpu.features.\n'
                 'The original error is: %s\n' % cpt.get_exception_message(e))
         if not has_avx:
-            try:
-                has_avx = os.popen(
-                    'sysctl machdep.cpu.leaf7_features | grep -i avx').read(
-                    ) != ''
-            except Exception as e:
-                sys.stderr.write(
-                    'Can not get the AVX flag from machdep.cpu.leaf7_features.\n'
-                    'The original error is: %s\n' %
-                    cpt.get_exception_message(e))
+            import subprocess
+            pipe = subprocess.Popen(
+                'sysctl machdep.cpu.leaf7_features | grep -i avx',
+                shell=True,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE)
+            _ = pipe.communicate()
+            has_avx = True if pipe.returncode == 0 else False
         return has_avx
     elif sysstr == 'windows':
         import ctypes