Compilation issues on Perlmutter

[diehlpk]

Expected Behavior

Octo-Tiger should compile as it was on Summit.

Actual Behavior

clang-12: warning: argument unused during compilation: '-allow-unsupported-compiler' [-Wunused-command-line-argument]                                                                                     
In file included from <built-in>:1:
In file included from /global/common/software/nersc/cos1.3/cuda/11.3.0/bin/../targets/x86_64-linux/include/cuda_runtime.h:83:
/global/common/software/nersc/cos1.3/cuda/11.3.0/bin/../targets/x86_64-linux/include/crt/host_config.h:147:2: error: -- unsupported clang version! clang version must be less than 12 and greater than 3.2
 . The nvcc flag '-allow-unsupported-compiler' can be used to override this version check; however, using an unsupported host compiler may cause compilation failure or incorrect run time execution. Use
at your own risk.
#error -- unsupported clang version! clang version must be less than 12 and greater than 3.2 . The nvcc flag '-allow-unsupported-compiler' can be used to override this version check; however, using an u
nsupported host compiler may cause compilation failure or incorrect run time execution. Use at your own risk.
^
In file included from <built-in>:1:                                                                                                                                                                       
In file included from /global/common/software/nersc/cos1.3/cuda/11.3.0/bin/../targets/x86_64-linux/include/cuda_runtime.h:83:
/global/common/software/nersc/cos1.3/cuda/11.3.0/bin/../targets/x86_64-linux/include/crt/host_config.h:147:2: error: -- unsupported clang version! clang version must be less than 12 and greater than 3.2
 . The nvcc flag '-allow-unsupported-compiler' can be used to override this version check; however, using an unsupported host compiler may cause compilation failure or incorrect run time execution. Use
at your own risk.
#error -- unsupported clang version! clang version must be less than 12 and greater than 3.2 . The nvcc flag '-allow-unsupported-compiler' can be used to override this version check; however, using an u
nsupported host compiler may cause compilation failure or incorrect run time execution. Use at your own risk.
^
clang-12: error: Unsupported CUDA gpu architecture: OFF
11:29

Steps to Reproduce the Problem

... Please be as specific as possible while describing how to reproduce your problem.

1. Compile all dependencies
2. Compile Octo-Tiger

Specifications

... Please describe your environment

• HPX Version: 1.6.0
• Platform (compiler, OS): Perlmutter, Cray, clang 12

[diehlpk]

It seems that CUDA 11.3.0 does not support Clang 12. Not much we can do right now.