[osx] Align build settings with Xcode framework project template

In particular, -Os yields significant size improvements in Release.

platform/osx/sdk/framework-osx.gypi

@@ -18,13 +18,22 @@
       ],
 
       'xcode_settings': {
-        'SDKROOT': 'macosx',
-        'SUPPORTED_PLATFORMS':'macosx',
-        'OTHER_LDFLAGS': [ '-stdlib=libc++', '-lstdc++' ],
-        'INSTALL_PATH': '@executable_path/../Frameworks',
-        'INFOPLIST_FILE': '../platform/osx/sdk/Info.plist',
         'CLANG_ENABLE_OBJC_ARC': 'YES',
+        'CURRENT_PROJECT_VERSION': '0',
+        'DEFINES_MODULE': 'YES',
+        'DYLIB_INSTALL_NAME_BASE': '@rpath',
+        'INFOPLIST_FILE': '../platform/osx/sdk/Info.plist',
+        'LD_RUNPATH_SEARCH_PATHS': [
+          '$(inherited)',
+          '@executable_path/Frameworks',
+          '@loader_path/Frameworks',
+        ],
         'PRODUCT_BUNDLE_IDENTIFIER': 'com.mapbox.MapboxGL',
+        'OTHER_LDFLAGS': [ '-stdlib=libc++', '-lstdc++' ],
+        'SDKROOT': 'macosx',
+        'SKIP_INSTALL': 'YES',
+        'SUPPORTED_PLATFORMS':'macosx',
+        'VERSIONING_SYSTEM': 'apple-generic',
       },
       
       'mac_framework_headers': [
@@ -37,6 +46,19 @@
         './Mapbox.m',
       ],
       
+      'configurations': {
+        'Debug': {
+          'xcode_settings': {
+            'GCC_OPTIMIZATION_LEVEL': '0',
+          },
+        },
+        'Release': {
+          'xcode_settings': {
+            'GCC_OPTIMIZATION_LEVEL': 's',
+          },
+        },
+      },
+      
       'direct_dependent_settings': {
         'libraries': [
           '$(SDKROOT)/System/Library/Frameworks/Cocoa.framework',

scripts/osx/package.sh

@@ -27,12 +27,14 @@ export BUILDTYPE=${BUILDTYPE:-Release}
 export HOST=osx
 make Xcode/osx
 
-step "Building OS X framework (build ${TRAVIS_JOB_NUMBER:-${BITRISE_BUILD_NUMBER:-0}})..."
+VERSION=${TRAVIS_JOB_NUMBER:-${BITRISE_BUILD_NUMBER:-0}}
+
+step "Building OS X framework (build ${VERSION})..."
 xcodebuild -sdk macosx${OSX_SDK_VERSION} \
     ARCHS="x86_64" \
     ONLY_ACTIVE_ARCH=NO \
     GCC_GENERATE_DEBUGGING_SYMBOLS=${GCC_GENERATE_DEBUGGING_SYMBOLS} \
-    CURRENT_PROJECT_VERSION=${TRAVIS_JOB_NUMBER:-${BITRISE_BUILD_NUMBER:-0}} \
+    CURRENT_PROJECT_VERSION=${VERSION} \
     -project ./build/osx-x86_64/gyp/osx.xcodeproj \
     -configuration ${BUILDTYPE} \
     -target osxsdk \