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[C++20][Modules] Add testcases from section 10.2 dependent on header units.
This adds in testcases reflecting the remaining example in section 10.2 of the C++20 standard. Differential Revision: https://reviews.llvm.org/D122124
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// Based on C++20 10.2 example 2.
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// RUN: rm -rf %t
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// RUN: mkdir -p %t
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// RUN: split-file %s %t
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// RUN: %clang_cc1 -std=c++20 -emit-header-unit -I %t \
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// RUN: -xc++-user-header std-10-2-ex2-c.h -o %t/std-10-2-ex2-c.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/std-10-2-ex2-tu1.cpp \
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// RUN: -o %t/X.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/std-10-2-ex2-tu2.cpp \
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// RUN: -fmodule-file=%t/std-10-2-ex2-c.pcm -fmodule-file=%t/X.pcm \
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// RUN: -pedantic-errors -verify -o %t/M.pcm
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//--- std-10-2-ex2-b.h
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int f();
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//--- std-10-2-ex2-c.h
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int g();
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//--- std-10-2-ex2-tu1.cpp
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export module X;
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export int h();
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//--- std-10-2-ex2-tu2.cpp
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module;
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#include "std-10-2-ex2-b.h"
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export module M;
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import "std-10-2-ex2-c.h";
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import X;
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export using ::f, ::g, ::h; // OK
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struct S; // expected-note {{target of using declaration}}
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export using ::S; // expected-error {{using declaration referring to 'S' with module linkage cannot be exported}}
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namespace N {
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export int h();
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static int h(int); // expected-note {{target of using declaration}}
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} // namespace N
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export using N::h; // expected-error {{using declaration referring to 'h' with internal linkage cannot be exported}}
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