Add an opt-in -Wheader-hygiene, which current diagnoses the use of

global using directives in C++ headers, from Elliot Glaysher!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@127881 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 15 insertions, 0 deletions

diff --git a/test/SemaCXX/warn-using-namespace-in-header.h b/test/SemaCXX/warn-using-namespace-in-header.h
new file mode 100644
index 0000000000..677c4ac51a
--- /dev/null
+++ b/test/SemaCXX/warn-using-namespace-in-header.h
@@ -0,0 +1,15 @@
+
+
+
+
+
+// Lots of vertical space to make the error line match up with the line of the
+// expected line in the source file.
+namespace warn_in_header_in_global_context {}
+using namespace warn_in_header_in_global_context;
+
+// While we want to error on the previous using directive, we don't when we are
+// inside a namespace
+namespace dont_warn_here {
+using namespace warn_in_header_in_global_context;
+}