undefined symbol results in SIGABRT on macOS

Author: eregon

spec/truffle/capi/unimplemented_spec.rb

@@ -12,7 +12,8 @@
 
 describe "Unimplemented functions in the C-API" do
   it "abort the process and show an error including the function name" do
-    out = ruby_exe('require ARGV[0]; CApiRbTrErrorSpecs.new.not_implemented_function("foo")', args: "#{extension_path} 2>&1", exit_status: 127)
-    out.should.include?('undefined symbol: rb_str_shared_replace')
+    expected_status = platform_is(:darwin) ? :SIGABRT : 127
+    out = ruby_exe('require ARGV[0]; CApiRbTrErrorSpecs.new.not_implemented_function("foo")', args: "#{extension_path} 2>&1", exit_status: expected_status)
+    out.should =~ /undefined symbol: rb_str_shared_replace|Symbol not found: _rb_str_shared_replace/
   end
 end