Avoid using -bundle with -dynamiclib on darwin.

configure

@@ -118,7 +118,7 @@ class Configure
 
     # TODO: add conditionals for platforms
     if RbConfig::CONFIG["build_os"] =~ /darwin/
-      @ldshared = "#{@cc} -dynamic -bundle -undefined suppress -flat_namespace"
+      @ldshared = "#{@cc} -bundle -undefined suppress -flat_namespace"
     else
       @ldshared = "#{@cc} -shared"
     end

rakelib/ext_helper.rb

@@ -99,7 +99,14 @@ def add_mri_capi
   $LIBS << " #{DEFAULT["LIBS"]}"
   $LIBS << " #{DEFAULT["DLDLIBS"]}"
 
-  unless RUBY_PLATFORM =~ /mingw/
+  case RUBY_PLATFORM
+  when /mingw/
+    # do nothing
+  when /darwin/
+    # necessary to avoid problems with RVM injecting flags into the MRI build
+    # process.
+    add_ldflag DEFAULT["LDSHARED"].split[1..-1].join(' ').gsub(/-dynamiclib/, "")
+  else
     add_ldflag DEFAULT["LDSHARED"].split[1..-1].join(' ')
   end
 
@@ -183,7 +190,7 @@ def add_rbx_capi
 when /darwin/
   # on Unix we need a g++ link, not gcc.
   # Ff line contributed by Daniel Harple.
-  $LDSHARED = "#{$CXX} -dynamic -bundle -undefined suppress -flat_namespace -lstdc++"
+  $LDSHARED = "#{$CXX} -bundle -undefined suppress -flat_namespace -lstdc++"
 
 when /aix/
   $LDSHARED = "#{$CXX} -shared -Wl,-G -Wl,-brtl"

spec/ruby/optional/capi/rake_helper.rb

@@ -7,7 +7,7 @@
 case PLATFORM
 when /darwin/
   output = "#{$cwd}/#{$ext_name}.bundle"
-  build_cmd = "cc -dynamic -bundle -undefined suppress -flat_namespace #{common} -o #{output}"
+  build_cmd = "cc -bundle -undefined suppress -flat_namespace #{common} -o #{output}"
 else
   output = "#{$cwd}/#{$ext_name}.so"
   build_cmd = "cc -shared #{common} -o #{output}"