Undefined symbols for architecture arm64

[Haiyong Zhang]

Hi,

I am using Xcode 7.3 and GStreamer iOS 1.8.1. I created a project by using
"GStreamer single view template". However, I got error messages when I
tried to use #define GST_IOS_PLUGINS_EFFECTS.
The error messages are as below. Please help me figure out how to fix this
problem Thanks.

Undefined symbols for architecture arm64:

  "std::basic_string<char, std::char_traits<char>, std::allocator<char>
>::basic_string(char const*, std::allocator<char> const&)", referenced from:

      soundtouch::SoundTouch::putSamples(float const*, unsigned int) in
GStreamer(libSoundTouch_a_arm64_-SoundTouch.o)

      soundtouch::FIRFilter::setCoefficients(float const*, unsigned int,
unsigned int) in GStreamer(libSoundTouch_a_arm64_-FIRFilter.o)

  "std::runtime_error::runtime_error(std::string const&)", referenced from:

      soundtouch::SoundTouch::putSamples(float const*, unsigned int) in
GStreamer(libSoundTouch_a_arm64_-SoundTouch.o)

      soundtouch::FIRFilter::setCoefficients(float const*, unsigned int,
unsigned int) in GStreamer(libSoundTouch_a_arm64_-FIRFilter.o)

  "std::string::_Rep::_S_empty_rep_storage", referenced from:

      soundtouch::SoundTouch::putSamples(float const*, unsigned int) in
GStreamer(libSoundTouch_a_arm64_-SoundTouch.o)

      soundtouch::FIRFilter::setCoefficients(float const*, unsigned int,
unsigned int) in GStreamer(libSoundTouch_a_arm64_-FIRFilter.o)

  "std::string::_Rep::_M_destroy(std::allocator<char> const&)", referenced
from:

      soundtouch::SoundTouch::putSamples(float const*, unsigned int) in
GStreamer(libSoundTouch_a_arm64_-SoundTouch.o)

      soundtouch::FIRFilter::setCoefficients(float const*, unsigned int,
unsigned int) in GStreamer(libSoundTouch_a_arm64_-FIRFilter.o)

ld: symbol(s) not found for architecture arm64

clang: error: linker command failed with exit code 1 (use -v to see
invocation)
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