Rename flag, use class name to access static variables

Author: dyashuni

setup.py

@@ -73,18 +73,18 @@ def cpp_flag(compiler):
 
 class BuildExt(build_ext):
     """A custom build extension for adding compiler-specific options."""
-    native_flag = '-march=native'
+    compiler_flag_native = '-march=native'
     c_opts = {
         'msvc': ['/EHsc', '/openmp', '/O2'],
-        'unix': ['-O3', native_flag],  # , '-w'
+        'unix': ['-O3', compiler_flag_native],  # , '-w'
     }
     link_opts = {
         'unix': [],
         'msvc': [],
     }
 
     if os.environ.get("HNSWLIB_NO_NATIVE"):
-        c_opts['unix'].remove(native_flag)
+        c_opts['unix'].remove(compiler_flag_native)
 
     if sys.platform == 'darwin':
         c_opts['unix'] += ['-stdlib=libc++', '-mmacosx-version-min=10.7']
@@ -95,18 +95,18 @@ class BuildExt(build_ext):
 
     def build_extensions(self):
         ct = self.compiler.compiler_type
-        opts = self.c_opts.get(ct, [])
+        opts = BuildExt.c_opts.get(ct, [])
         if ct == 'unix':
             opts.append('-DVERSION_INFO="%s"' % self.distribution.get_version())
             opts.append(cpp_flag(self.compiler))
             if has_flag(self.compiler, '-fvisibility=hidden'):
                 opts.append('-fvisibility=hidden')
             if not os.environ.get("HNSWLIB_NO_NATIVE"):
                 # check that native flag is available
-                print('checking avalability of flag:', self.native_flag)
-                if not has_flag(self.compiler, self.native_flag):
-                    print('removing unsupported compiler flag:', self.native_flag)
-                    opts.remove(self.native_flag)
+                print('checking avalability of flag:', BuildExt.compiler_flag_native)
+                if not has_flag(self.compiler, BuildExt.compiler_flag_native):
+                    print('removing unsupported compiler flag:', BuildExt.compiler_flag_native)
+                    opts.remove(BuildExt.compiler_flag_native)
                     # for macos add apple-m1 flag if it's available
                     if sys.platform == 'darwin':
                         m1_flag = '-mcpu=apple-m1'
@@ -117,13 +117,13 @@ def build_extensions(self):
                         else:
                             print(f'flag: {m1_flag} is not available')
                 else:
-                    print(f'flag: {self.native_flag} is available')
+                    print(f'flag: {BuildExt.compiler_flag_native} is available')
         elif ct == 'msvc':
             opts.append('/DVERSION_INFO=\\"%s\\"' % self.distribution.get_version())
 
         for ext in self.extensions:
             ext.extra_compile_args.extend(opts)
-            ext.extra_link_args.extend(self.link_opts.get(ct, []))
+            ext.extra_link_args.extend(BuildExt.link_opts.get(ct, []))
 
         build_ext.build_extensions(self)