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from 30940fe1ee NFC. The patch fixes r321395, that cuased -Werror=unused-bu [...] new 0b1c457218 Reapply r321781: [Modules] Allow modules specified by -fmodu [...]

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Summary of changes: include/clang/Basic/DiagnosticCommonKinds.td | 3 + include/clang/Basic/Module.h | 18 +++- include/clang/Lex/HeaderSearch.h | 1 + include/clang/Lex/ModuleMap.h | 36 ++++++- lib/Basic/Module.cpp | 7 +- lib/Lex/HeaderSearch.cpp | 20 ++-- lib/Lex/ModuleMap.cpp | 103 ++++++++++++++------- lib/Lex/PPDirectives.cpp | 17 +++- test/Modules/Inputs/shadow/A1/A.h | 1 + test/Modules/Inputs/shadow/A1/module.modulemap | 5 + test/Modules/Inputs/shadow/A2/A.h | 1 + test/Modules/Inputs/shadow/A2/module.modulemap | 5 + test/Modules/Inputs/shadowed-submodule/A1/Foo.h | 1 + .../Inputs/shadowed-submodule/A1/module.modulemap | 14 +++ test/Modules/Inputs/shadowed-submodule/A1/sys/A.h | 1 + test/Modules/Inputs/shadowed-submodule/A1/sys/A2.h | 1 + test/Modules/Inputs/shadowed-submodule/A2/Foo.h | 1 + .../Inputs/shadowed-submodule/A2/module.modulemap | 14 +++ test/Modules/Inputs/shadowed-submodule/A2/sys/A.h | 1 + test/Modules/Inputs/shadowed-submodule/A2/sys/A2.h | 1 + .../Inputs/shadowed-submodule/Foo/module.modulemap | 3 + test/Modules/shadow.m | 21 +++++ test/Modules/shadowed-submodule.m | 5 + 23 files changed, 228 insertions(+), 52 deletions(-) create mode 100644 test/Modules/Inputs/shadow/A1/A.h create mode 100644 test/Modules/Inputs/shadow/A1/module.modulemap create mode 100644 test/Modules/Inputs/shadow/A2/A.h create mode 100644 test/Modules/Inputs/shadow/A2/module.modulemap create mode 100644 test/Modules/Inputs/shadowed-submodule/A1/Foo.h create mode 100644 test/Modules/Inputs/shadowed-submodule/A1/module.modulemap create mode 100644 test/Modules/Inputs/shadowed-submodule/A1/sys/A.h create mode 100644 test/Modules/Inputs/shadowed-submodule/A1/sys/A2.h create mode 100644 test/Modules/Inputs/shadowed-submodule/A2/Foo.h create mode 100644 test/Modules/Inputs/shadowed-submodule/A2/module.modulemap create mode 100644 test/Modules/Inputs/shadowed-submodule/A2/sys/A.h create mode 100644 test/Modules/Inputs/shadowed-submodule/A2/sys/A2.h create mode 100644 test/Modules/Inputs/shadowed-submodule/Foo/module.modulemap create mode 100644 test/Modules/shadow.m create mode 100644 test/Modules/shadowed-submodule.m