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// REQUIRES: shell
// RUN: rm -rf %t
// RUN: rm -rf %t-saved
// RUN: mkdir %t-saved
// Initial module build
// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -fdisable-module-hash \
// RUN: -isysroot %S/Inputs/System -triple x86_64-apple-darwin10 -fsyntax-only %s -verify
// RUN: cp %t/cstd.pcm %t-saved/cstd.pcm
// Even with -Werror don't rebuild a system module
// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -fdisable-module-hash \
// RUN: -isysroot %S/Inputs/System -triple x86_64-apple-darwin10 -fsyntax-only %s -verify -Werror
// RUN: diff %t/cstd.pcm %t-saved/cstd.pcm
// Unless -Wsystem-headers is on
// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -fdisable-module-hash \
// RUN: -isysroot %S/Inputs/System -triple x86_64-apple-darwin10 -fsyntax-only %s -verify \
// RUN: -Werror=unused -Wsystem-headers
// RUN: not diff %t/cstd.pcm %t-saved/cstd.pcm
// expected-no-diagnostics
@import cstd;
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