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.
71 lines
2.0 KiB
C++
71 lines
2.0 KiB
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 -emit-module-interface %t/a.cppm -o %t/a.pcm
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// RUN: %clang_cc1 -std=c++20 %t/b.cppm -fprebuilt-module-path=%t -emit-module-interface -o %t/b.pcm -verify
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//
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// Testing the behavior of `-fskip-odr-check-in-gmf`
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// RUN: %clang_cc1 -std=c++20 -fskip-odr-check-in-gmf -emit-module-interface %t/a.cppm -o \
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// RUN: %t/a.pcm
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// RUN: %clang_cc1 -std=c++20 -fskip-odr-check-in-gmf %t/b.cppm -fprebuilt-module-path=%t \
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// RUN: -emit-module-interface -DSKIP_ODR_CHECK_IN_GMF -o %t/b.pcm -verify
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// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface %t/a.cppm -o %t/a.pcm
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// RUN: %clang_cc1 -std=c++20 %t/b.cppm -fprebuilt-module-path=%t -emit-reduced-module-interface -o %t/b.pcm -verify
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//--- foo.h
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namespace std
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{
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template<class _Dom1>
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void operator &&(_Dom1 __v, _Dom1 __w)
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{
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return;
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}
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}
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//--- bar.h
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namespace std
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{
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template<typename... _Types>
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struct _Traits
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{
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static constexpr bool _S_copy_ctor =
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(__is_trivial(_Types) && ...);
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};
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template<typename... _Types>
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struct variant
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{
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void
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swap(variant& __rhs)
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noexcept((__is_trivial(_Types) && ...))
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{
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}
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};
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}
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//--- a.cppm
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module;
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// The operator&& defined in 'foo.h' will pollute the
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// expression '__is_trivial(_Types) && ...' in bar.h
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#include "foo.h"
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#include "bar.h"
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export module a;
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//--- b.cppm
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module;
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#include "bar.h"
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export module b;
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import a;
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#ifdef SKIP_ODR_CHECK_IN_GMF
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// expected-no-diagnostics
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#else
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// expected-error@* {{has different definitions in different modules; first difference is defined here found data member '_S_copy_ctor' with an initializer}}
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// expected-note@* {{but in 'a.<global>' found data member '_S_copy_ctor' with a different initializer}}
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// expected-error@* {{from module 'a.<global>' is not present in definition of 'variant<_Types...>' provided earlier}}
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// expected-note@* {{declaration of 'swap' does not match}}
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#endif
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