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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Frontend] Emit a warning diagnostic for attributes that are ignored."
href="https://bugs.llvm.org/show_bug.cgi?id=40810">40810</a>
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<th>Summary</th>
<td>[Frontend] Emit a warning diagnostic for attributes that are ignored.
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>matthew.davis@sony.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>Clang has a handful of IgnoredAttribute diagnostics, controlled by the option
'-Wignored-attributes' However, clang does not warn on certain cases that
could be helpful to developers. For instance, it might be useful to extend
this warning to template type arguments that have attributes that are ignored.
For example, the 'aligned' attribute is silently dropped in the following:
// clang++ ex.cc -fsyntax-only -Wignored-attributes
typedef int type1 __attribute__((aligned(16)));
template <typename T>
struct S {
static const auto value = alignof(T);
};
static_assert(S<type1>::value == 16, "Unexpected alignment for S<type1>");
In this case, g++ will emit the following warning:
"ignoring attributes on template argument ‘type1 {aka int}’
[-Wignored-attributes]"</pre>
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