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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 - invalid types 'const float2 {aka const float}[unsigned int]' for array subscript"
href="https://bugs.llvm.org/show_bug.cgi?id=37925">37925</a>
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<th>Summary</th>
<td>invalid types 'const float2 {aka const float}[unsigned int]' for array subscript
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</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
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>zhonghao@pku.org.cn
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>The code is as follow:
typedef float float2 __attribute__( ( ext_vector_type( 2 ) ) );
const float &get( const float2 &vec, unsigned int index ) {
return vec[ index ];
}
int main() {
float2 a;
get( a, 1 );
}
clang produces a warning message:
warning: returning reference to local temporary object
[-Wreturn-stack-address]
return vec[ index ];
^~~~~~~~~~~~
g++ rejects the code:
code0.c.cpp:1:62: warning: 'ext_vector_type' attribute directive ignored
[-Wattributes]
typedef float float2 __attribute__( ( ext_vector_type( 2 ) ) );
^
code0.c.cpp: In function 'const float& get(const float2&, unsigned int)':
code0.c.cpp:4:20: error: invalid types 'const float2 {aka const float}[unsigned
int]' for array subscript
return vec[ index ];
It seems that the diagnose of gcc is more reasonable, right?</pre>
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