Modules hide macro definitions by default, so that silly things like

include guards don't show up as macro definitions in every translation
unit that imports a module. Macro definitions can, however, be
exported with the intentionally-ugly #__export_macro__
directive. Implement this feature by not even bothering to serialize
non-exported macros to a module, because clients of that module need
not (should not) know that these macros even exist.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@138943 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 33 insertions, 0 deletions

diff --git a/test/Modules/macros.c b/test/Modules/macros.c
new file mode 100644
index 0000000000..691e8ec0ec
--- /dev/null
+++ b/test/Modules/macros.c
@@ -0,0 +1,33 @@
+// RUN: %clang_cc1 -emit-module -o %t/macros.pcm -DMODULE %s
+// RUN: %clang_cc1 -verify -I %t %s
+
+#if defined(MODULE)
+#define INTEGER(X) int
+#define FLOAT float
+#define DOUBLE double
+
+#__export_macro__ INTEGER
+#__export_macro__ DOUBLE
+
+#else
+
+__import_module__ macros;
+
+#ifndef INTEGER
+#  error INTEGER macro should be visible
+#endif
+
+#ifdef FLOAT
+#  error FLOAT macro should not be visible
+#endif
+
+#ifdef MODULE
+#  error MODULE macro should not be visible
+#endif
+
+double d;
+DOUBLE *dp = &d;
+
+#__export_macro__ WIBBLE // expected-error{{no macro named 'WIBBLE' to export}}
+
+#endif