limit disabling ruby gems to MRI > 1.9wq

Author: JonRowe

travis/script/functions.sh

@@ -8,9 +8,11 @@ export JRUBY_OPTS=${JRUBY_OPTS:-"--server -Xcompile.invokedynamic=false"}
 SPECS_HAVE_RUN_FILE=specs.out
 MAINTENANCE_BRANCH=`cat maintenance-branch`
 
-# Don't allow rubygems to pollute what's loaded. Also, things boot
-# faster without the extra load time of rubygems.
-export RUBYOPT="--disable=gem"
+# Don't allow rubygems to pollute what's loaded. Also, things boot faster
+# without the extra load time of rubygems. Only works on MRI Ruby 1.9+
+if is_mri_192_plus; then
+  export RUBYOPT="--disable=gem"
+fi
 
 function clone_repo {
   if [ ! -d $1 ]; then # don't clone if the dir is already there

travis/script/predicate_functions.sh

@@ -20,6 +20,16 @@ function is_mri_192 {
   fi
 }
 
+function is_mri_192_plus {
+  if is_mri; then
+    if ruby -e "exit(RUBY_VERSION.to_f > 1.9)"; then
+      return 0
+    else
+      return 1
+    fi
+  fi
+}
+
 function is_mri_2plus {
   if is_mri; then
     if ruby -e "exit(RUBY_VERSION.to_f > 2.0)"; then