<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/133075>133075</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Compilation failure for OpenMP on older family
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          KaruroChori
      </td>
    </tr>
</table>

<pre>
    I tried compiling with `clang++-21 test.cpp -fopenmp -fopenmp-targets=nvptx64-nvidia-cuda -Xopenmp-target=nvptx64 -march=sm_60`
```c++
#include <iostream>
#include <cstdio>
using namespace std;

int main(){
        #pragma omp target parallel
 {
                printf("Hello\n");
        }
        return 0;
}
```
on an older card which is *sm_60*.  
The compiler failed with this message:

```
fatal error: error in backend: PTX does not support "atomic" for orderings different than"NotAtomic" or "Monotonic" for sm_60 or older, but order is: "seq_cst".
clang++-21: error: clang frontend command failed with exit code 70 (use -v to see invocation)
Debian clang version 21.0.0 (++20250324101504+0adc672ed4a2-1~exp1~20250324221624.2732)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-21/bin
clang++-21: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++-21: note: diagnostic msg: /tmp/test-sm_60-c20c2d.cpp
clang++-21: note: diagnostic msg: /tmp/test-c40dad.cpp
clang++-21: note: diagnostic msg: /tmp/test-sm_60-c20c2d.sh
```

I personally don't think it is a "real" bug, just that some features are not available on older cards, but since it asked for it, here I posted it.
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJykVU9v27gT_TT0ZSCDHsmyffBBieM2-KVN0PqH7a2gyJHEliK1JOWml372BSUnaXb3sohgCDRn-Dh_3huJEHRrifZsfcXWh4UYY-f8_n_Cj95dd87rRe3Uz_0tRK9JgXT9oI22LfzQsQNWcmmEbRleMbzKcAWRQlzKYYCscQPZ_mWRReFbioHlB3se4mNZZPaslRaZHJWA7MsrtxcvyHrhZcfyQ-i_lpyVnPGKzYuSy_nqtIW5ttKMioDl19qF6En0LL_5h02GqLSbLWNIyVjRUxiEJAhRsXyC45W2EXqhLcMtwx3bpG24PAzzwYu2F-D6AeaYYRBeGEMm-b12f3oGr21sJkB8T8Y4tr62DDHh56_wN4ff_nmKo7fAL6FNtucSMF45C8KCM4o8SOEV_Oi07EAHYFjNZcNqCcB4dero0kXy0AhtSM29jJ0O0FMIoiWWV3MJfr-kEVEYIO-dZ3k1L0BbqIX8TlalvYfTF1COAlgXIYzD4HwEhiii67VkiNA4D84r8tq2AZRuGvJkI8ROpDp8dLF69nU-nf3grIvOvhyf8knGKV-G11CPcQYFHVIYDDHQn19liAxxyXj1mqTP0afFZILGOxvJTgTvhVWvKkOPOoJ0imDDgeF2DATZGaKDQATanp0UUTubmsirA9Va2AvumXzQzgKulnw5HZ6jQI5rnmOx4qs1LxhecaFkuUFShcBs9Yseh9WvJyfEVYnFEjc5zlecLhKp4HFbfi2LbJCZ0XZ8zFo7Tj32JBT0TpFJXoML-pHx6taGmAiqDtrPdTqOwTM8Gl2ntzn3qTx4rLX916pZFxM3QGnRWheiltCHdoJKInvDb2Lbw91N9fkGqtOpun4Pp_c3cLy_u7v_4_bjOzje3t18htP9tH31_3fw6ebh_tNpZuqDp8E7SSGQguBGL4nhNjDcQWqmCMFJLSIp8KOFIL0e4rODJzCpg6RAxBnvP2WOx9gP6U0hZhM5M4lcokpz8E1gsuBKvB3mVUyh-5usEy9gIB-cFcb8BJWIvEmK1PY76JimiEiS8iRM0mA9tkl038YwyTZCcD1BQyKOnsJUzyR_cRbaiNoQuN9HU3gSbNBWUsIX4TupSdk6JmNHnuA2kTa1RMflQu1ztct3YkH71abA3a7YFutFt883u7JWu2LLd3WzKetit5USeb3dyBJVuV3o_UVD5SpfFXy93NSqWRPKjeLNStRrVnDqhTbLxP2l8-1ChzDSfpXnfLNeGFGTCdPHEdHSD5isaV6vDwu_nwRTj21gBTc6xPACE3U0tL-eBu00HKaJMnqaEr0fyH54eClMI3ptfi5Gb_ZdjEMaYgyPDI-tjt1YL6XrL_p8kung3TeSkeFxCikwPF5iPu_xrwAAAP__uTVmhw">