434ac4612f
See discussion in https://github.com/llvm/llvm-project/issues/125071. Makes the note clearer for the unreachable case: Before: ``` ./hoge.h:5:12: warning: instantiation of function 'x<int>' required here, but no definition is available [-Wundefined-func-template] 5 | void f() { x<int>(); } | ^ ./shared_ptr2.h:4:6: note: forward declaration of template entity is here 4 | void x() { T t; (void)t; } | ^ ./hoge.h:5:12: note: add an explicit instantiation declaration to suppress this warning if 'x<int>' is explicitly instantiated in another translation unit 5 | void f() { x<int>(); } | ``` After: ``` ./hoge.h:5:12: warning: instantiation of function 'x<int>' required here, but no definition is available [-Wundefined-func-template] 5 | void f() { x<int>(); } | ^ ./shared_ptr2.h:4:6: note: declaration of template entity is unreachable here 4 | void x() { T t; (void)t; } | ^ 1 warning generated. ```
40 lines
797 B
C++
40 lines
797 B
C++
// RUN: rm -rf %t
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// RUN: split-file %s %t
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// RUN: %clang_cc1 -std=c++20 -fmodules -fmodules-cache-path=%t -I%t \
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// RUN: -Wundefined-func-template \
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// RUN: -fimplicit-module-maps %t/main.cpp 2>&1 | grep "unreachable declaration of template entity is here"
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// Note that the diagnostics are triggered when building the 'hoge' module, which is imported from the main file.
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// The "-verify" flag doesn't work in this case. Instead, we grep the expected text to verify the test.
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//--- shared_ptr2.h
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#pragma once
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template<class T>
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void x() { }
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//--- hoge.h
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#pragma once
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#include "shared_ptr2.h"
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inline void f() {
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x<int>();
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}
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//--- module.modulemap
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module hoge {
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header "hoge.h"
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}
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module shared_ptr2 {
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header "shared_ptr2.h"
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}
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//--- main.cpp
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#include "hoge.h"
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int main() {
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f();
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}
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