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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Wrong type of ternary expression; (void const*)0 erroneously treated as the null pointer constant"
href="https://bugs.llvm.org/show_bug.cgi?id=39809">39809</a>
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<th>Summary</th>
<td>Wrong type of ternary expression; (void const*)0 erroneously treated as the null pointer constant
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>unspecified
</td>
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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
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Frontend
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>pskocik@gmail.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>This compiles on gcc:
//null-ptr constant select other type
_Generic( 0?(int const*)0: (void*)0, int const*: (void)0);
//not null-ptr constant, ptr to void with combined qualifs
_Generic( 0?(int const*)0: (void*)1, void const*: (void)0);
//not null-ptr constant, ptr to void with combined qualifs
_Generic( 0?(int volatile*)0:(void const*)1, void volatile const*:
(void)0);
//GCC and CLANG disagree
//not null-ptr constant, ptr to void with combined qualifs
_Generic( 0?(int volatile*)0:(void const*)0, void volatile const*:
(void)0);
but clang types the last ternary as `int volatile*` treating `(void const*)0`
as the null pointer constant whereas gcc doesn't treat it as such.
I believe gcc is right here. The C standard defines the null pointer constant
as either `0` or `(void*)0`. It's weird, but `(void const*)0` doesn't qualify
(or qualifies way too much if you know what I mean).</pre>
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