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.
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
// RUN: rm -rf %t
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// RUN: mkdir %t
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// RUN: split-file %s %t
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//
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/same_as.cppm -o %t/same_as.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface -fprebuilt-module-path=%t %t/concepts.cppm -o %t/concepts.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface -fprebuilt-module-path=%t %t/format.cppm -o %t/format.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/conflicting.cppm -o %t/conflicting.pcm
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// RUN: %clang_cc1 -std=c++20 -fprebuilt-module-path=%t %t/Use.cppm -fsyntax-only -verify
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// Test again with reduced BMI.
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// RUN: rm -rf %t
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// RUN: mkdir %t
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// RUN: split-file %s %t
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//
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// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface %t/same_as.cppm -o %t/same_as.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface -fprebuilt-module-path=%t %t/concepts.cppm -o %t/concepts.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface -fprebuilt-module-path=%t %t/format.cppm -o %t/format.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface %t/conflicting.cppm -o %t/conflicting.pcm
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// RUN: %clang_cc1 -std=c++20 -fprebuilt-module-path=%t %t/Use.cppm -fsyntax-only -verify
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//--- same_as.cppm
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export module same_as;
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export template <class T, class U>
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concept same_as = __is_same(T, U);
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//--- concepts.cppm
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export module concepts;
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export import same_as;
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export template <class T>
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concept ConflictingConcept = true;
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//--- format.cppm
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export module format;
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export import concepts;
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export import same_as;
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export template <class T> void foo()
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requires same_as<T, int>
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{}
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//--- conflicting.cppm
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export module conflicting;
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export template <class T, class U = int>
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concept ConflictingConcept = true;
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//--- Use.cppm
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import format;
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import conflicting;
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template <class T> void foo()
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requires same_as<T, T>
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{}
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ConflictingConcept auto x = 10; // expected-error {{reference to 'ConflictingConcept' is ambiguous}}
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// expected-note@* 2 {{candidate}}
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