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.
38 lines
1.3 KiB
C++
38 lines
1.3 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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// RUN: cd %t
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//
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// RUN: %clang_cc1 -std=c++20 M.cpp -fsyntax-only -DTEST_INTERFACE -verify
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// RUN: %clang_cc1 -std=c++20 M.cpp -emit-module-interface -o M.pcm
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// RUN: %clang_cc1 -std=c++20 M.cpp -emit-reduced-module-interface -o M.reduced.pcm
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// RUN: %clang_cc1 -std=c++20 useM.cpp -fsyntax-only -fmodule-file=M=M.pcm -verify
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// RUN: %clang_cc1 -std=c++20 useM.cpp -fsyntax-only -fmodule-file=M=M.reduced.pcm -verify
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//--- decls.h
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int f(); // #1, attached to the global module
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int g(); // #2, attached to the global module
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//--- M.cpp
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module;
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#include "decls.h"
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export module M;
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export using ::f; // OK, does not declare an entity, exports #1
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#if TEST_INTERFACE
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// error: matches #2, but attached to M
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int g(); // expected-error {{declaration of 'g' in module M follows declaration in the global module}}
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// expected-note@decls.h:2 {{previous declaration is here}}
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#endif
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export int h(); // #3
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export int k(); // #4
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//--- useM.cpp
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import M;
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// error: matches #3
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static int h(); // expected-error {{static declaration of 'h' follows non-static declaration}}
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// expected-note@M.cpp:10 {{previous declaration is here}}
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// error: matches #4
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int k(); // expected-error {{declaration of 'k' in the global module follows declaration in module M}}
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// expected-note@M.cpp:11 {{previous declaration is here}}
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