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.
51 lines
1011 B
C++
51 lines
1011 B
C++
// 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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//
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// RUN: %clang_cc1 -std=c++20 %t/X.cppm -emit-module-interface -o %t/X.pcm
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// RUN: %clang_cc1 -std=c++20 -fprebuilt-module-path=%t %t/Use.cpp -fsyntax-only -verify
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//
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// RUN: %clang_cc1 -std=c++20 %t/X.cppm -emit-reduced-module-interface -o %t/X.pcm
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// RUN: %clang_cc1 -std=c++20 -fprebuilt-module-path=%t %t/Use.cpp -fsyntax-only -verify
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//
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//--- foo.h
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#ifndef FOO_H
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#define FOO_H
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template <typename T>
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struct base {};
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template <typename T>
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struct foo;
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template <typename T>
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struct foo {};
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template <>
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struct foo<int> : base<int> {
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int getInt();
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};
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#endif // FOO_H
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//--- X.cppm
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module;
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#include "foo.h"
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export module X;
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export template <class T>
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class X {
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foo<int> x;
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public:
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int print() {
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return x.getInt();
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}
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};
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//--- Use.cpp
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import X;
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foo<int> f; // expected-error {{'foo' must be declared before it is used}}
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// expected-note@* {{declaration here is not visible}}
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int bar() {
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X<int> x;
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return x.print();
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}
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