configure: remove compiler detection

The GCC version is no longer relevant since only 4.8 and newer are
supported. It's probably safe to assume clang on mac since V8 does
so too.

PR-URL: https://github.com/iojs/io.js/pull/205
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

common.gypi

@@ -9,8 +9,6 @@
     'library%': 'static_library',     # allow override to 'shared_library' for DLL/.so builds
     'component%': 'static_library',   # NB. these names match with what V8 expects
     'msvs_multi_core_compile': '0',   # we do enable multicore compiles, but not using the V8 way
-    'gcc_version%': 'unknown',
-    'clang%': 0,
     'python%': 'python',
 
     'node_tag%': '',
@@ -38,6 +36,11 @@
         'OBJ_DIR': '<(PRODUCT_DIR)/obj.target',
         'V8_BASE': '<(PRODUCT_DIR)/obj.target/deps/v8/tools/gyp/libv8_base.a',
       }],
+      ['OS=="mac"', {
+        'clang%': 1,
+      }, {
+        'clang%': 0,
+      }],
     ],
   },
 

configure

@@ -398,22 +398,6 @@ def host_arch_win():
   return matchup.get(arch, 'ia32')
 
 
-def compiler_version():
-  try:
-    proc = subprocess.Popen(shlex.split(CC) + ['--version'],
-                            stdout=subprocess.PIPE)
-  except WindowsError:
-    return (0, False)
-
-  is_clang = 'clang' in proc.communicate()[0].split('\n')[0]
-
-  proc = subprocess.Popen(shlex.split(CC) + ['-dumpversion'],
-                          stdout=subprocess.PIPE)
-  version = tuple(map(int, proc.communicate()[0].split('.')))
-
-  return (version, is_clang)
-
-
 def configure_arm(o):
   if options.arm_float_abi:
     arm_float_abi = options.arm_float_abi
@@ -455,12 +439,6 @@ def configure_node(o):
   if target_arch == 'arm':
     configure_arm(o)
 
-  cc_version, is_clang = compiler_version()
-  o['variables']['clang'] = 1 if is_clang else 0
-
-  if not is_clang and cc_version != 0:
-    o['variables']['gcc_version'] = 10 * cc_version[0] + cc_version[1]
-
   if flavor in ('solaris', 'mac', 'linux', 'freebsd'):
     use_dtrace = not options.without_dtrace
     # Don't enable by default on linux and freebsd