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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang mistakes gnu::nothrow attribute for noexcept(true)"
href="https://bugs.llvm.org/show_bug.cgi?id=48111">48111</a>
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<th>Summary</th>
<td>Clang mistakes gnu::nothrow attribute for noexcept(true)
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Keywords</th>
<td>compile-fail
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++17
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>hstong@ca.ibm.com
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>Clang seems to treat [[gnu::nothrow]] like `noexcept(true)` even in the type
system. GCC does not do so, and the distinction seems to be reasonable.
Compiler Explorer link: <a href="https://godbolt.org/z/heGWWb">https://godbolt.org/z/heGWWb</a>
### SOURCE (<stdin>):
void f [[gnu::nothrow]]();
template <typename> struct A;
template <> struct A<void ()> {};
A<decltype(f)> a;
### COMPILER INVOCATION:
clang -cc1 -fsyntax-only -xc++ -std=c++17 -
### EXPECTED OUTPUT:
(clean compile)
### ACTUAL OUTPUT:
<stdin>:4:16: error: implicit instantiation of undefined template 'A<void ()
noexcept>'
A<decltype(f)> a;
^
<stdin>:2:28: note: template is declared here
template <typename> struct A;
^
1 error generated.
### COMPILER VERSION INFO (clang++ -v):
clang version 12.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
1c19900f9417bd0b832c1cb70863b2439a18647f)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/wandbox/clang-head/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64</pre>
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