1 files changed, 34 insertions, 0 deletions
diff --git a/test/Modules/Rmodule-build.m b/test/Modules/Rmodule-build.m
new file mode 100644
index 0000000000000..b8abc01c2c1a4
--- /dev/null
+++ b/test/Modules/Rmodule-build.m
@@ -0,0 +1,34 @@
+// REQUIRES: shell
+// RUN: rm -rf %t
+// RUN: mkdir %t
+// RUN: echo '// A' > %t/A.h
+// RUN: echo '// B' > %t/B.h
+// RUN: echo 'module A { header "A.h" }' > %t/module.modulemap
+// RUN: echo 'module B { header "B.h" }' >> %t/module.modulemap
+
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -fsyntax-only %s -verify \
+// RUN:            -I %t -Rmodule-build
+
+@import A; // expected-remark{{building module 'A' as}}
+@import B; // expected-remark{{building module 'B' as}}
+@import A; // no diagnostic
+@import B; // no diagnostic
+
+// RUN: echo ' ' >> %t/B.h
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -fsyntax-only %s -I %t \
+// RUN:            -Rmodule-build 2>&1 | FileCheck %s
+
+// RUN: echo ' ' >> %t/B.h
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -fsyntax-only %s -I %t \
+// RUN:            -Reverything 2>&1 | FileCheck %s
+
+// RUN: echo ' ' >> %t/B.h
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -fsyntax-only %s -I %t \
+// RUN:            2>&1 | count 0
+
+// RUN: echo ' ' >> %t/B.h
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -fsyntax-only %s -I %t \
+// RUN:            -Rmodule-build -Rno-everything 2>&1 | count 0
+
+// CHECK-NOT: building module 'A'
+// CHECK: building module 'B'