1 files changed, 45 insertions, 0 deletions
diff --git a/test/Modules/rebuild.m b/test/Modules/rebuild.m
new file mode 100644
index 0000000000000..4d4d05529e7d3
--- /dev/null
+++ b/test/Modules/rebuild.m
@@ -0,0 +1,45 @@
+// RUN: rm -rf %t
+
+// Build Module and set its timestamp
+// RUN: echo '@import Module;' | %clang_cc1 -fmodules -fmodules-cache-path=%t -fdisable-module-hash -fsyntax-only -F %S/Inputs -x objective-c -
+// RUN: touch -m -a -t 201101010000 %t/Module.pcm
+// RUN: cp %t/Module.pcm %t/Module.pcm.saved
+// RUN: wc -c %t/Module.pcm > %t/Module.size.saved
+
+// Build DependsOnModule
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -fdisable-module-hash -fsyntax-only -F %S/Inputs %s
+// RUN: diff %t/Module.pcm %t/Module.pcm.saved
+// RUN: cp %t/DependsOnModule.pcm %t/DependsOnModule.pcm.saved
+
+// Rebuild Module, reset its timestamp, and verify its size hasn't changed
+// RUN: rm %t/Module.pcm
+// RUN: echo '@import Module;' | %clang_cc1 -fmodules -fmodules-cache-path=%t -fdisable-module-hash -fsyntax-only -F %S/Inputs -x objective-c -
+// RUN: touch -m -a -t 201101010000 %t/Module.pcm
+// RUN: wc -c %t/Module.pcm > %t/Module.size
+// RUN: diff %t/Module.size %t/Module.size.saved
+// RUN: cp %t/Module.pcm %t/Module.pcm.saved.2
+
+// But the signature at least is expected to change, so we rebuild DependsOnModule.
+// NOTE: if we change how the signature is created, this test may need updating.
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -fdisable-module-hash -fsyntax-only -F %S/Inputs %s
+// RUN: diff %t/Module.pcm %t/Module.pcm.saved.2
+// RUN: not diff %t/DependsOnModule.pcm %t/DependsOnModule.pcm.saved
+
+// Rebuild Module, reset its timestamp, and verify its size hasn't changed
+// RUN: rm %t/Module.pcm
+// RUN: echo '@import Module;' | %clang_cc1 -fmodules -fmodules-cache-path=%t -fdisable-module-hash -fsyntax-only -F %S/Inputs -x objective-c -
+// RUN: touch -m -a -t 201101010000 %t/Module.pcm
+// RUN: wc -c %t/Module.pcm > %t/Module.size
+// RUN: diff %t/Module.size %t/Module.size.saved
+// RUN: cp %t/Module.pcm %t/Module.pcm.saved.2
+
+// Verify again with Module pre-imported.
+// NOTE: if we change how the signature is created, this test may need updating.
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -fdisable-module-hash -fsyntax-only -F %S/Inputs %s
+// RUN: diff %t/Module.pcm %t/Module.pcm.saved.2
+// RUN: not diff %t/DependsOnModule.pcm %t/DependsOnModule.pcm.saved
+
+#ifdef PREIMPORT
+@import Module;
+#endif
+@import DependsOnModule;