Add in --hidden-visibility support (#37)

Author: mobileben

boost.sh

@@ -205,6 +205,9 @@ OPTIONS:
         Specify the macOS architectures to build for. Space-separate list.
         Defaults to ${MACOS_ARCHS[*]}
 
+    --hidden-visibility
+        Compile using -fvisibility=hidden and -fvisibility-inlines-hidden
+
     --no-framework
         Do not create the framework.
 
@@ -376,6 +379,10 @@ parseArgs()
                 fi
                 ;;
 
+            --hidden-visibility)
+                CXX_FLAGS="$CXX_FLAGS -fvisibility=hidden -fvisibility-inlines-hidden"
+                ;;
+
             --universal)
                 UNIVERSAL=1
                 ;;