da00c60dae
Close https://github.com/llvm/llvm-project/issues/71034 See https://discourse.llvm.org/t/rfc-c-20-modules-introduce-thin-bmi-and-decls-hash/74755 This patch introduces reduced BMI, which doesn't contain the definitions of functions and variables if its definitions won't contribute to the ABI. Testing is a big part of the patch. We want to make sure the reduced BMI contains the same behavior with the existing and relatively stable fatBMI. This is pretty helpful for further reduction. The user interfaces part it left to following patches to ease the reviewing.
55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
// 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=X=%t/X.pcm \
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// RUN: -pedantic-errors -verify -o %t/M.pcm
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// Test again with reduced BMI.
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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-reduced-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-reduced-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=X=%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"; // expected-warning {{the implementation of header units is in an experimental phase}}
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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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