Minor updates to the help message printed by build_ios_libs.sh (with -h)

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 72 matching lines @@
   # Strip debug symbols to reduce size.
   if [[ ${build_type} = "static_only" ]]; then
     strip -S ${OUTPUT_DIR}/obj/webrtc/sdk/lib${GN_TARGET_NAME}.a -o \
         ${OUTPUT_DIR}/lib${GN_TARGET_NAME}.a
   fi
 }
 
 function usage {
   echo "WebRTC iOS FAT libraries build script."
   echo "Each architecture is compiled separately before being merged together."
-  echo "By default, the fat libraries will be created in out_ios_libs/."
+  echo "By default, the library is created in out_ios_libs/. (Change with -o.)"
   echo "The headers will be copied to out_ios_libs/include."
-  echo "Usage: $0 [-h] [-b build_type] [-c] [-o output_dir]"
+  echo "Usage: $0 [-h] [-b build_type] [-c] [-o output_dir] [-r rev_num] [-e]"
   echo "  -h Print this help."
-  echo "  -b The build type. Can be framework or static_only."
-  echo "     Defaults to framework."
-  echo "  -c Removes generated build output."
-  echo "  -o Specifies a directory to output build artifacts to."
+  echo "  -b The build type. Can be \"framework\" or \"static_only\"."
+  echo "     Defaults to \"framework\"."
+  echo "  -c Removes the previously generated build output, if any."
+  echo "  -o Specifies a directory to output the build artifacts to."
   echo "     If specified together with -c, deletes the dir."
   echo "  -r Specifies a revision number to embed if building the framework."
   echo "  -e Compile with bitcode."
   exit 0
 }
 
 SDK_OUTPUT_DIR=${WEBRTC_BASE_DIR}/out_ios_libs
 SDK_LIB_NAME="librtc_sdk_objc.a"
 SDK_FRAMEWORK_NAME="WebRTC.framework"
 
@@ skipping 93 matching lines @@
   VERSION_NUMBER="${MAJOR_MINOR}.${WEBRTC_REVISION}"
   echo "Substituting revision number: ${VERSION_NUMBER}"
   PlistBuddy -c "Set :CFBundleVersion ${VERSION_NUMBER}" ${INFOPLIST_PATH}
   plutil -convert binary1 ${INFOPLIST_PATH}
 else
   echo "BUILD_TYPE ${BUILD_TYPE} not supported."
   exit 1
 fi
 
 echo "Done."