ae2b303391
Close https://github.com/llvm/llvm-project/issues/166068 The cause of the problem is that we would import initializers and pending implicit instantiations from other named module. This is very bad and it may waste a lot of time. And we didn't observe it as the weak symbols can live together and the strong symbols would be removed by other mechanism. So we didn't observe the bad behavior for a long time. But it indeeds waste compilation time.
39 lines
1.2 KiB
C++
39 lines
1.2 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 %t/flyweight.cppm -emit-reduced-module-interface -o %t/flyweight.pcm
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// RUN: %clang_cc1 -std=c++20 %t/account.cppm -emit-reduced-module-interface -o %t/account.pcm -fprebuilt-module-path=%t
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// RUN: %clang_cc1 -std=c++20 %t/core.cppm -emit-reduced-module-interface -o %t/core.pcm -fprebuilt-module-path=%t
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// RUN: %clang_cc1 -std=c++20 %t/core.cppm -fprebuilt-module-path=%t -emit-llvm -disable-llvm-passes -o - | FileCheck %t/core.cppm
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//--- flyweight.cppm
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module;
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template <typename> struct flyweight_core {
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static bool init() { (void)__builtin_operator_new(2); return true; }
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static bool static_initializer;
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};
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template <typename T> bool flyweight_core<T>::static_initializer = init();
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export module flyweight;
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export template <class> void flyweight() {
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(void)flyweight_core<int>::static_initializer;
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}
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//--- account.cppm
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export module account;
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import flyweight;
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export void account() {
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(void)::flyweight<int>;
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}
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//--- core.cppm
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export module core;
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import account;
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extern "C" void core() {}
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// Fine enough to check it won't crash.
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// CHECK-NOT: init
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// CHECK-NOT: static_initializer
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// CHECK: define {{.*}}@core(
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