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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 - -Wnull-dereference warns about pointers with address_space attribute"
href="https://bugs.llvm.org/show_bug.cgi?id=42292">42292</a>
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<th>Summary</th>
<td>-Wnull-dereference warns about pointers with address_space attribute
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>8.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>FreeBSD
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>tijl@coosemans.org
</td>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>% cat test.c
int f(void) {
return *(int __attribute__((address_space(256))) *) 0;
}
% clang80 -S test.c
test.c:2:12: warning: indirection of non-volatile null pointer will be deleted,
not trap [-Wnull-dereference]
return *(int __attribute__((address_space(256))) *) 0;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test.c:2:12: note: consider using __builtin_trap() or qualifying pointer with
'volatile'
1 warning generated.
This warning seems incorrect for pointers with address_space attribute. Clang
also doesn't delete the dereference. It correctly produces "movl %gs:0, %eax".</pre>
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