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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - incompatible pointer types warning restrict"
href="https://bugs.llvm.org/show_bug.cgi?id=42001">42001</a>
</td>
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<tr>
<th>Summary</th>
<td>incompatible pointer types warning restrict
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>gonzalobg88@gmail.com
</td>
</tr>
<tr>
<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>
<div>
<pre>This:
int foo() {
int * const restrict * restrict f = 0;
int * const * b = 0;
f = b;
b = f;
return 0;
}
int bar() {
typedef int(*foo)(int * const restrict * restrict);
typedef int(*bar)(int * const *);
foo f = 0;
bar b = 0;
f = b;
b = f;
return 0;
}
produces (godbolt: <a href="https://godbolt.org/z/gvUZfc">https://godbolt.org/z/gvUZfc</a>) these warnings:
<source>:5:4: warning: assigning to 'int *const *' from 'int *const restrict
*restrict' discards qualifiers
[-Wincompatible-pointer-types-discards-qualifiers]
b = f;
^ ~
<source>:15:7: warning: incompatible function pointer types assigning to 'foo'
(aka 'int (*)(int *const restrict *restrict)') from 'bar' (aka 'int (*)(int
*const *)') [-Wincompatible-function-pointer-types]
f = b;
^ ~
<source>:16:7: warning: incompatible function pointer types assigning to 'bar'
(aka 'int (*)(int *const *)') from 'foo' (aka 'int (*)(int *const restrict
*restrict)') [-Wincompatible-function-pointer-types]
b = f;
---
I'm not sure how "incompatible" these pointers really are, but I expect a
restrict pointer to implicitly coerce to a non-restrict one at least. Like, in
this example:
int foo() {
int * const * f = 0;
int * * b = 0;
f = b;
return 0;
}
no warnings are produced.</pre>
</div>
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