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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 - Cannot write to std::array inside CUDA __device__ lambda"
href="https://bugs.llvm.org/show_bug.cgi?id=45024">45024</a>
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<th>Summary</th>
<td>Cannot write to std::array inside CUDA __device__ lambda
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>9.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</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>rgovostes@gmail.com
</td>
</tr>
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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>--------
#include <array>
int main() {
auto l = [] __device__ () {
std::array<int, 1> x;
x[0] = 1;
};
return 0;
}
--------
When compiled with `clang++ -std=c++14 test.cu` this fails with:
test.cu:6:8: error: cannot assign to return value because function 'operator[]'
returns a const value
x[0] = 1;
~~~~ ^
This appears only to be the case if this is a __device__ lambda. Otherwise the
array is writable as expected.</pre>
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