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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 - std::min and std::max cannot be used in __host__ __device__ functions under C++14"
href="https://bugs.llvm.org/show_bug.cgi?id=37753">37753</a>
</td>
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<tr>
<th>Summary</th>
<td>std::min and std::max cannot be used in __host__ __device__ functions under C++14
</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>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>release blocker
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>CUDA
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>j.l.k@gmx.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>The following commit does not do the right thing because it makes it impossible
to use the std::min and std::max functions in __host__ __device__ functions
under C++14.
<a href="https://github.com/llvm-mirror/clang/commit/">https://github.com/llvm-mirror/clang/commit/</a>
2528a79005f7195f1ede353e21688e5223ac2460#diff-0df73228daf7d086a1a4baf1dc1b092e
Simple repro case:
////////////////////
#include <algorithm>
#include <cstdio>
__host__ __device__
void print_min(int a, int b)
{
printf("min(%d, %d) = %d\n", a, b, std::min(a, b));
}
int main()
{
print_min(1, 2);
return 0;
}
////////////////////
Compilation with nvcc from CUDA 9.2 succeeds: `nvcc -std=c++14
--expt-relaxed-constexpr std_min.cu -o std_min`
clang 7.0.0 (trunk 334304) fails: `clang++ -std=c++14 --cuda-gpu-arch=sm_61
std_min.cu -o std_min`
Actual error message:
std_min.cu:13:45: error: reference to __device__ function 'min<int>' in
__host__ __device__
function
printf("min(%d, %d) = %d\n", a, b, std::min(a, b));
^
/usr/lib/clang/7.0.0/include/cuda_wrappers/algorithm:94:1: note: 'min<int>'
declared here// min(const __T &__a, const __T &__b) {
^
1 error generated when compiling for host.</pre>
</div>
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