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

webrtc/modules/audio_coding/main/acm2/acm_receiver_unittest.cc

 /*
  *  Copyright (c) 2013 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 275 matching lines @@
   EXPECT_FALSE(receiver_->vad_enabled());
 
   for (int n = 0; n < kNumPackets; ++n) {
     InsertOnePacketOfSilence(id);
     for (int k = 0; k < num_10ms_frames; ++k)
       ASSERT_EQ(0, receiver_->GetAudio(codecs_[id].plfreq, &frame));
   }
   EXPECT_EQ(AudioFrame::kVadUnknown, frame.vad_activity_);
 }
 
-TEST_F(AcmReceiverTest, DISABLED_ON_ANDROID(LastAudioCodec)) {
+#ifdef WEBRTC_CODEC_ISAC
+#define IF_ISAC_FLOAT(x) x
+#else
+#define IF_ISAC_FLOAT(x) DISABLED_##x
+#endif
+
+TEST_F(AcmReceiverTest, DISABLED_ON_ANDROID(IF_ISAC_FLOAT(LastAudioCodec))) {
   const int kCodecId[] = {
       ACMCodecDB::kISAC, ACMCodecDB::kPCMA, ACMCodecDB::kISACSWB,
       ACMCodecDB::kPCM16Bswb32kHz,
       -1  // Terminator.
   };
   AddSetOfCodecs(kCodecId);
 
   const int kCngId[] = {  // Not including full-band.
       ACMCodecDB::kCNNB, ACMCodecDB::kCNWB, ACMCodecDB::kCNSWB,
       -1  // Terminator.
@@ skipping 48 matching lines @@
     EXPECT_EQ(kCodecId[n], receiver_->last_audio_codec_id());
     EXPECT_EQ(0, receiver_->LastAudioCodec(&codec));
     EXPECT_TRUE(CodecsEqual(codecs_[kCodecId[n]], codec));
     ++n;
   }
 }
 
 }  // namespace acm2
 
 }  // namespace webrtc