Add visibility flag to GYP.

webrtc/build/ios/build_ios_libs.sh

 #!/bin/bash
 
 #  Copyright 2015 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 39 matching lines @@
 function build_webrtc {
   OUTPUT_DIR=$1
   FLAVOR=$2
   TARGET_ARCH=$3
   if [[ ${TARGET_ARCH} = 'arm' || ${TARGET_ARCH} = 'arm64' ]]; then
     FLAVOR="${FLAVOR}-iphoneos"
   else
     FLAVOR="${FLAVOR}-iphonesimulator"
   fi
   export GYP_DEFINES="OS=ios target_arch=${TARGET_ARCH} use_objc_h264=1 \
-clang_xcode=1"
+clang_xcode=1 ios_override_visibility=1"
   export GYP_GENERATORS="ninja"
   export GYP_GENERATOR_FLAGS="output_dir=${OUTPUT_DIR}"
   webrtc/build/gyp_webrtc webrtc/build/ios/merge_ios_libs.gyp
   if [[ ${USE_LEGACY_API} -eq 1 ]]; then
     ninja -C ${OUTPUT_DIR}/${FLAVOR} libjingle_peerconnection_objc_no_op
   else
     ninja -C ${OUTPUT_DIR}/${FLAVOR} webrtc_api_objc_no_op
   fi
   mkdir -p ${LIBRARY_BASE_DIR}/${TARGET_ARCH}
   mv ${OUTPUT_DIR}/${FLAVOR}/*.a ${LIBRARY_BASE_DIR}/${TARGET_ARCH}
 }
 
 # Build all the common architectures.
 build_webrtc "out_ios_arm" "Release" "arm"
 build_webrtc "out_ios_arm64" "Release" "arm64"
 build_webrtc "out_ios_ia32" "Release" "ia32"
 build_webrtc "out_ios_x86_64" "Release" "x64"
 
 popd
 
 # Export header files.
 ${EXPORT_HEADERS_SCRIPT} ${WEBRTC_BASE_DIR}/${LIBRARY_BASE_DIR} \
     ${USE_LEGACY_API}
 
 # Merge the libraries together.
 ${MERGE_SCRIPT} ${WEBRTC_BASE_DIR}/${LIBRARY_BASE_DIR}