OpenSSL: Disable specific warnings when using clang.

openssl.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'targets': [
     {
       'target_name': 'openssl',
       'type': '<(library)',
       'defines': [
         'L_ENDIAN',
         'OPENSSL_THREADS',
         'PURIFY',
         'TERMIO',
         '_REENTRANT',
         # We do not use TLS over UDP on Chromium so far.
         'OPENSSL_NO_DTLS1',
       ],
-      'copts': [
-        '-w',
-        '-Wno-cast-qual',
-        '-Wno-error',
-      ],
       'sources': [
         'openssl/ssl/bio_ssl.c',
         'openssl/ssl/d1_both.c',
         'openssl/ssl/d1_clnt.c',
         'openssl/ssl/d1_enc.c',
         'openssl/ssl/d1_lib.c',
         'openssl/ssl/d1_meth.c',
         'openssl/ssl/d1_pkt.c',
         'openssl/ssl/d1_srvr.c',
         'openssl/ssl/kssl.c',
@@ skipping 618 matching lines @@
             ['exclude', 'crypto/store/.*$'],
             ['exclude', 'crypto/whrlpool/.$'],
           ],
         }, {
           'sources/': [
             ['exclude', 'camellia/.*$'],
             ['exclude', 'cms/.*$'],
             ['exclude', 'mdc2/.*$'],
           ],
         }],
+        ['clang==1', {
+          'cflags': [
+            # OpenSSL has a few |if ((foo == NULL))| checks.
+            '-Wno-parentheses-equality',
+            # OpenSSL uses several function-style macros and then ignores the
+            # returned value.
+            '-Wno-unused-value',
+          ],
+        }, { # Not clang. Disable all warnings.
+          'cflags': [
+            '-w',
+          ],
+        }]
       ],
       'include_dirs': [
         '.',
         'openssl',
         'openssl/crypto',
         'openssl/crypto/asn1',
         'openssl/crypto/evp',
         'openssl/crypto/store',
         'openssl/include',
         '<@(openssl_config_path)',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           'openssl/include',
           '<@(openssl_config_path)',
         ],
       },
     },
   ],
 }
 
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