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diff --git a/clang/test/Modules/prune-non-affecting-module-map-files.m b/clang/test/Modules/prune-non-affecting-module-map-files.m
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+// Check that the presence of non-affecting module map files does not affect the
+// contents of PCM files.
+
+// RUN: rm -rf %t && mkdir %t
+// RUN: split-file %s %t
+
+//--- a/module.modulemap
+module a {}
+
+//--- b/module.modulemap
+module b {}
+
+//--- c/module.modulemap
+module c { header "c.h" }
+//--- c/c.h
+@import b;
+
+//--- tu.m
+@import c;
+
+//--- explicit-mms-common-args.rsp
+-fmodule-map-file=b/module.modulemap -fmodule-map-file=c/module.modulemap -fmodules -fmodules-cache-path=cache -fdisable-module-hash -fsyntax-only tu.m
+//--- implicit-search-args.rsp
+-I a -I b -I c -fimplicit-module-maps -fmodules -fmodules-cache-path=cache -fdisable-module-hash -fsyntax-only tu.m
+//--- implicit-search-args.rsp-end
+
+// Test with explicit module map files.
+//
+// RUN: %clang_cc1 -working-directory %t @%t/explicit-mms-common-args.rsp
+// RUN: mv %t/cache %t/cache-explicit-no-a-prune
+// RUN: %clang_cc1 -working-directory %t @%t/explicit-mms-common-args.rsp -fno-modules-prune-non-affecting-module-map-files
+// RUN: mv %t/cache %t/cache-explicit-no-a-keep
+//
+// RUN: %clang_cc1 -working-directory %t -fmodule-map-file=a/module.modulemap @%t/explicit-mms-common-args.rsp
+// RUN: mv %t/cache %t/cache-explicit-a-prune
+// RUN: %clang_cc1 -working-directory %t -fmodule-map-file=a/module.modulemap @%t/explicit-mms-common-args.rsp -fno-modules-prune-non-affecting-module-map-files
+// RUN: mv %t/cache %t/cache-explicit-a-keep
+//
+// RUN: diff %t/cache-explicit-no-a-prune/c.pcm %t/cache-explicit-a-prune/c.pcm
+// RUN: not diff %t/cache-explicit-no-a-keep/c.pcm %t/cache-explicit-a-keep/c.pcm
+
+// Test with implicit module map search.
+//
+// RUN: %clang_cc1 -working-directory %t @%t/implicit-search-args.rsp
+// RUN: mv %t/cache %t/cache-implicit-no-a-prune
+// RUN: %clang_cc1 -working-directory %t @%t/implicit-search-args.rsp -fno-modules-prune-non-affecting-module-map-files
+// RUN: mv %t/cache %t/cache-implicit-no-a-keep
+//
+// FIXME: Instead of removing "a/module.modulemap" from the file system, we
+// could drop the "-I a" search path argument in combination with the
+// "-fmodules-skip-header-search-paths" flag. Unfortunately, that flag
+// does not prevent serialization of the search path usage bit vector,
+// making the files differ anyways.
+// RUN: rm %t/a/module.modulemap
+//
+// RUN: %clang_cc1 -working-directory %t @%t/implicit-search-args.rsp
+// RUN: mv %t/cache %t/cache-implicit-a-prune
+// RUN: %clang_cc1 -working-directory %t @%t/implicit-search-args.rsp -fno-modules-prune-non-affecting-module-map-files
+// RUN: mv %t/cache %t/cache-implicit-a-keep
+//
+// RUN: diff %t/cache-implicit-no-a-prune/c.pcm %t/cache-implicit-a-prune/c.pcm
+// RUN: not diff %t/cache-implicit-no-a-keep/c.pcm %t/cache-implicit-a-keep/c.pcm