https://bugs.llvm.org/show_bug.cgi?id=47689
Bug ID: 47689
Summary: [clang-cl] Implicit instantiation of template within
its own definition inside noexcept of friend member
function
Product: clang
Version: 11.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: rixr...@gmail.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
Boost asio the following workaround:
https://github.com/chriskohlhoff/asio/blob/38fda8d/asio/include/asio/execution/blocking.hpp#L328-L336
The first one for clang was fixed in 8c98c880. However there remains a
workaround for MSVC compiler.
The latest MSVC (19.27.29112) is able to handle both cases, but clang-cl is
able to handle only the second case.
Consider the following minified example:
template <typename T>
struct false_t {
static constexpr bool value = false;
};
template <int I = 0>
struct S {
using t = void;
friend void query() noexcept(false_t<S<>::t>::value) {}
};
MSVC is able to compile this:
C:\boost_test>cl /c test.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 19.27.29112 for x64
Copyright (C) Microsoft Corporation. All rights reserved.
test.cpp
However, clang-cl is unable to compile:
C:\boost_test>C:\llvm\llvm-11.0.0rc4\bin\clang-cl.exe /c
test.cpp
test.cpp(9,42): error: implicit instantiation of template 'S<0>' within its
own definition
friend void query() noexcept(false_t<S<>::t>::value) {}
^
1 error generated.
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