Error building webrtc library for iOS - ios

Question

I've been trying to build webrtc for iOS following Google's directions at http://www.webrtc.org/native-code/ios (and related links). Although I recall that with similar steps I've been able to build it in the past this is no longer the case.
Here's the steps I did:
Download prerequisites:
$ git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
$ export PATH=`pwd`/depot_tools:"$PATH"
Download repo:
$ export GYP_DEFINES="OS=ios"
$ fetch webrtc_ios
Prepare build:
$ cd webrtc/src
$ export GYP_DEFINES="build_with_libjingle=1 build_with_chromium=0 libjingle_objc=1"
$ export GYP_DEFINES="$GYP_DEFINES OS=ios target_arch=armv7"
$ export GYP_GENERATOR_FLAGS="output_dir=out_ios"
$ export GYP_CROSSCOMPILE=1
$ gclient runhooks
Build:
$ ninja -C out_ios/Debug-iphoneos AppRTCDemo
Everything is ok, until the last command that fails with /bin/sh: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc: No such file or directory:
ninja: Entering directory `out_ios/Debug-iphoneos'
[3/1664] CC obj/chromium/src/third_party/boringssl/src/crypto/bio/boringssl.bio_mem.o
FAILED: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc -MMD -MF obj/chromium/src/third_party/boringssl/src/crypto/bio/boringssl.bio_mem.o.d -DV8_DEPRECATION_WARNINGS -DCLD_VERSION=2 -DDISABLE_NACL -DCHROMIUM_BUILD -DCR_CLANG_REVISION=247874-1 -DUSE_LIBJPEG_TURBO=1 -DENABLE_CONFIGURATION_POLICY -DSYSTEM_NATIVELY_SIGNALS_MEMORY_PRESSURE -DDONT_EMBED_BUILD_METADATA -DFIELDTRIAL_TESTING_ENABLED -DDISABLE_FTP_SUPPORT=1 -DV8_USE_EXTERNAL_STARTUP_DATA -DBORINGSSL_IMPLEMENTATION -DBORINGSSL_NO_STATIC_INITIALIZER -DOPENSSL_NO_ASM -DUSE_LIBPCI=1 -DUSE_OPENSSL=1 -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DWTF_USE_DYNAMIC_ANNOTATIONS=1 -Igen -I../../chromium/src/third_party/boringssl/src/include -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.0.sdk -O0 -gdwarf-2 -fvisibility=hidden -Wnewline-eof -miphoneos-version-min=7.0 -arch arm64 -Wendif-labels -Wno-unused-parameter -Wno-missing-field-initializers -Wno-selector-type-mismatch -Wheader-hygiene -Wno-char-subscripts -Wno-unneeded-internal-declaration -Wno-covered-switch-default -Wstring-conversion -Wno-c++11-narrowing -Wno-deprecated-register -Wno-inconsistent-missing-override -Wno-shift-negative-value -Wno-bitfield-width -Wno-unused-function -Wno-unused-variable -m32 -arch i386 -pipe -no-cpp-precomp -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.0.sdk -I/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.0.sdk/usr/include/ -m32 -arch i386 -pipe -no-cpp-precomp -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.0.sdk -I/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.0.sdk/usr/include/ -std=c99 -Xclang -load -Xclang /Volumes/store/code/webrtc/src/third_party/llvm-build/Release+Asserts/lib/libFindBadConstructs.dylib -Xclang -add-plugin -Xclang find-bad-constructs -fcolor-diagnostics -fstack-protector-all -Wno-undefined-bool-conversion -Wno-tautological-undefined-compare -c ../../chromium/src/third_party/boringssl/src/crypto/bio/bio_mem.c -o obj/chromium/src/third_party/boringssl/src/crypto/bio/boringssl.bio_mem.o
/bin/sh: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc: No such file or directory
For some reason ninja thinks we are building for the Simulator, plus even if we did this would not be the right path to get gcc. Notice that my system has XCode 7 installed.
Any ideas what might be wrong or how I could work around this?
Best regards,
Antonis

Answer 1

A year ago I also wanted to build library using Google's instructions but I was unable to. Many errors occurred and I ended up googling for some build script. In the end I found this script. Make following steps and you will build it successfully:
Install Command Line Tools but pasting this command in terminal: xcode-select --install
Clone script: git clone https://github.com/lunastorm/webrtc-ios.git
Enter git repository in Terminal and run script with following command: make -j4 where j4 marks number of CPU cores (correct me if I'm wrong). This can take a while so prepare your self a cup of coffee
Build will fail for the first time but don't worry, just delete the folders which script downloaded. I will write which ones in edit
Find your code signing identity which is valid for building iOS apps. Type security find-identity in terminal. Pick one under Valid identities only
Open the global configuration file src/build/common.gypi and search for the text ‘CODE_SIGN_IDENTITY’. Replace ‘CODE_SIGN_IDENTITY[sdk=iphoneos*]‘: ‘iPhone Developer’ with your developer information i.e. ‘CODE_SIGN_IDENTITY[sdk=iphoneos*]‘: ‘iPhone Developer: Josip Bernat (2V3DKW6SDC)’
Run the script again using make -j4 and hopefully it will build you WebRTC.framework