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.
42 lines
1.4 KiB
C++
42 lines
1.4 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 %t/foo.cppm -I%t -emit-module-interface -o %t/foo.pcm
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// RUN: %clang_cc1 -fprebuilt-module-path=%t -std=c++20 %t/use.cpp -fsyntax-only -verify
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// RUN: %clang_cc1 -std=c++20 %t/foo.cppm -I%t -emit-reduced-module-interface -o %t/foo.pcm
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// RUN: %clang_cc1 -fprebuilt-module-path=%t -std=c++20 %t/use.cpp -fsyntax-only -verify
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//--- foo.cppm
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export module foo;
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export template <typename T = int>
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T v;
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export template <int T = 8>
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int v2;
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export template <typename T>
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class my_array {};
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export template <template <typename> typename C = my_array>
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int v3;
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//--- use.cpp
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import foo;
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template <typename T = int>
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T v; // expected-error {{declaration of 'v' in the global module follows declaration in module foo}}
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// expected-note@foo.cppm:3 {{previous declaration is here}}
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template <int T = 8>
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int v2; // expected-error {{declaration of 'v2' in the global module follows declaration in module foo}}
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// expected-note@foo.cppm:6 {{previous declaration is here}}
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template <typename T>
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class my_array {}; // expected-error {{redefinition of 'my_array'}}
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// expected-note@foo.cppm:9 {{previous definition is here}}
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template <template <typename> typename C = my_array>
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int v3; // expected-error {{declaration of 'v3' in the global module follows declaration in module foo}}
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// expected-note@foo.cppm:12 {{previous declaration is here}}
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