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-rw-r--r--clang/test/Modules/implicit-opt-level.c15
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diff --git a/clang/test/Modules/implicit-opt-level.c b/clang/test/Modules/implicit-opt-level.c
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+++ b/clang/test/Modules/implicit-opt-level.c
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+// This test checks that under implicit modules, different optimization levels
+// get different context hashes.
+
+// RUN: rm -rf %t
+// RUN: split-file %s %t
+
+//--- module.modulemap
+module M { header "M.h" }
+//--- M.h
+//--- tu.c
+#include "M.h"
+
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t/cache -O0 -fsyntax-only %t/tu.c
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t/cache -O1 -fsyntax-only %t/tu.c
+// RUN: find %t/cache -name "M-*.pcm" | count 2