Don't link with audio codecs that we don't use

webrtc/modules/audio_coding/neteq/audio_decoder_unittest.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 684 matching lines @@
   EXPECT_EQ(16000, CodecSampleRateHz(kDecoderCNGwb));
   EXPECT_EQ(32000, CodecSampleRateHz(kDecoderCNGswb32kHz));
   EXPECT_EQ(48000, CodecSampleRateHz(kDecoderOpus));
   EXPECT_EQ(48000, CodecSampleRateHz(kDecoderOpus_2ch));
   // TODO(tlegrand): Change 32000 to 48000 below once ACM has 48 kHz support.
   EXPECT_EQ(32000, CodecSampleRateHz(kDecoderCNGswb48kHz));
   EXPECT_EQ(-1, CodecSampleRateHz(kDecoderArbitrary));
 }
 
 TEST(AudioDecoder, CodecSupported) {
+#ifdef WEBRTC_ARCH_ARM
+  static const bool has_isac_swb = false;

[hlundin-webrtc, 2015/09/22 09:09:18]

Nit: kHasIsacSwb?

[kwiberg-webrtc, 2015/09/22 09:37:04]

"Use a k followed by mixed case, e.g., kDaysInAWeek, for constants defined
globally or within a class. [...] This convention may optionally be used for
compile-time constants of local scope; otherwise the usual variable naming rules
apply."

I chose not to use a kCamelCase name because they're uglier and slightly harder
to read, and loudly signalling that this is a constant doesn't make this code
easier to read.

[hlundin-webrtc, 2015/09/22 10:05:55]

Acknowledged.

+#else
+  static const bool has_isac_swb = true;
+#endif
   EXPECT_TRUE(CodecSupported(kDecoderPCMu));
   EXPECT_TRUE(CodecSupported(kDecoderPCMa));
   EXPECT_TRUE(CodecSupported(kDecoderPCMu_2ch));
   EXPECT_TRUE(CodecSupported(kDecoderPCMa_2ch));
   EXPECT_TRUE(CodecSupported(kDecoderILBC));
   EXPECT_TRUE(CodecSupported(kDecoderISAC));
-  EXPECT_TRUE(CodecSupported(kDecoderISACswb));
-  EXPECT_TRUE(CodecSupported(kDecoderISACfb));
+  EXPECT_EQ(has_isac_swb, CodecSupported(kDecoderISACswb));
+  EXPECT_EQ(has_isac_swb, CodecSupported(kDecoderISACfb));
   EXPECT_TRUE(CodecSupported(kDecoderPCM16B));
   EXPECT_TRUE(CodecSupported(kDecoderPCM16Bwb));
   EXPECT_TRUE(CodecSupported(kDecoderPCM16Bswb32kHz));
   EXPECT_TRUE(CodecSupported(kDecoderPCM16Bswb48kHz));
   EXPECT_TRUE(CodecSupported(kDecoderPCM16B_2ch));
   EXPECT_TRUE(CodecSupported(kDecoderPCM16Bwb_2ch));
   EXPECT_TRUE(CodecSupported(kDecoderPCM16Bswb32kHz_2ch));
   EXPECT_TRUE(CodecSupported(kDecoderPCM16Bswb48kHz_2ch));
   EXPECT_TRUE(CodecSupported(kDecoderPCM16B_5ch));
   EXPECT_TRUE(CodecSupported(kDecoderG722));
   EXPECT_TRUE(CodecSupported(kDecoderG722_2ch));
   EXPECT_TRUE(CodecSupported(kDecoderRED));
   EXPECT_TRUE(CodecSupported(kDecoderAVT));
   EXPECT_TRUE(CodecSupported(kDecoderCNGnb));
   EXPECT_TRUE(CodecSupported(kDecoderCNGwb));
   EXPECT_TRUE(CodecSupported(kDecoderCNGswb32kHz));
   EXPECT_TRUE(CodecSupported(kDecoderCNGswb48kHz));
   EXPECT_TRUE(CodecSupported(kDecoderArbitrary));
   EXPECT_TRUE(CodecSupported(kDecoderOpus));
   EXPECT_TRUE(CodecSupported(kDecoderOpus_2ch));
 }
 
 }  // namespace webrtc