[modules] When determining whether a name from a module replaces a name we
already have, check whether the name from the module is actually newer than the
existing declaration. If it isn't, we might (say) replace a visible declaration
with an injected friend, and thus make it invisible (or lose a default argument
or an array bound).
llvm-svn: 228661
diff --git a/clang/test/Modules/Inputs/cxx-lookup/module.modulemap b/clang/test/Modules/Inputs/cxx-lookup/module.modulemap
index 6d397af..385c8c9 100644
--- a/clang/test/Modules/Inputs/cxx-lookup/module.modulemap
+++ b/clang/test/Modules/Inputs/cxx-lookup/module.modulemap
@@ -6,3 +6,5 @@
}
module X { header "x.h" export * }
module Y { header "y.h" export * }
+module na { header "na.h" export * }
+module nb { header "nb.h" export * }
diff --git a/clang/test/Modules/Inputs/cxx-lookup/na.h b/clang/test/Modules/Inputs/cxx-lookup/na.h
new file mode 100644
index 0000000..684d37e
--- /dev/null
+++ b/clang/test/Modules/Inputs/cxx-lookup/na.h
@@ -0,0 +1 @@
+namespace N { struct S { friend struct foo; }; }
diff --git a/clang/test/Modules/Inputs/cxx-lookup/nb.h b/clang/test/Modules/Inputs/cxx-lookup/nb.h
new file mode 100644
index 0000000..092c882
--- /dev/null
+++ b/clang/test/Modules/Inputs/cxx-lookup/nb.h
@@ -0,0 +1 @@
+namespace N { extern int n; }