Trying to link both aecm/aecm_core_mips.cc and aecm/aecm_core_c.cc into
the same library results in an error because they both try to implement
webrtc::WebRtcAecm_ProcessBlock():
[306/306] Linking target webrtc/modules/audio_processing/libwebrtc-audio-processing-1.so.3
FAILED: webrtc/modules/audio_processing/libwebrtc-audio-processing-1.so.3
c++ @webrtc/modules/audio_processing/libwebrtc-audio-processing-1.so.3.rsp
/usr/bin/ld: webrtc/modules/audio_processing/libwebrtc-audio-processing-1.so.3.p/aecm_aecm_core_mips.cc.o: in function `webrtc::WebRtcAecm_ProcessBlock(webrtc::AecmCore*, short const*, short const*, short const*, short*)':
[...]/webrtc/modules/audio_processing/aecm/aecm_core_mips.cc:934: multiple definition of `webrtc::WebRtcAecm_ProcessBlock(webrtc::AecmCore*, short const*, short const*, short const*, short*)'; webrtc/modules/audio_processing/libwebrtc-audio-processing-1.so.3.p/aecm_aecm_core_c.cc.o:[...]/webrtc/modules/audio_processing/aecm/aecm_core_c.cc:377: first defined here
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.
The MIPS-specific file is a replacement for the other, unlike the NEON
case. Don't add the default implementation unconditionally, add it only
for non-MIPS builds.
Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>