Bug 1922914 - Provide LLVM/Clang with OpenMP offload capabilities for NVDIA GPUs
Summary: Provide LLVM/Clang with OpenMP offload capabilities for NVDIA GPUs
Keywords:
Status: CLOSED EOL
Alias: None
Product: Fedora
Classification: Fedora
Component: llvm
Version: 33
Hardware: Unspecified
OS: Linux
unspecified
low
Target Milestone: ---
Assignee: Tom Stellard
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-02-01 04:25 UTC by Johannes Doerfert
Modified: 2021-11-30 17:52 UTC (History)
10 users (show)

Fixed In Version:
Doc Type: ---
Doc Text:
Clone Of:
Environment:
Last Closed: 2021-11-30 17:52:40 UTC
Type: Bug
Embargoed:


Attachments (Terms of Use)

Description Johannes Doerfert 2021-02-01 04:25:34 UTC
Description of problem:
LLVM/Clang requires a manual build to enable OpenMP offload capabilities for NVDIA GPUs. 

With LLVM 12 the build needs up to two flags to include offload capabilities:
1) if `LLVM_ENABLE_RUNTIMES` is not set to `all` it should include `openmp`
2) `LIBOMPTARGET_BUILD_NVPTX_BCLIB` should be set to `TRUE`

Version-Release number of selected component (if applicable):
LLVM/Clang before release 12.

How reproducible:

On a system with a NVIDIA GPU and cuda installed and locatable on the library path, compile OpenMP offload code and check if it is run on the device:

```
// a.c
int main() {
 #pragma omp target
  { }
}
```
clang -fopenmp -fopenmp-targets=nvptx64 a.c -o a.out 
./a.out 

Actual results:
0 return value

Expected results:
Error because execution on the GPU didn't happen but was mandatory.

Comment 1 Sylvestre Ledru 2021-02-01 08:06:05 UTC
To confirm, it landed in llvm/clang 12 ?

Comment 2 Johannes Doerfert 2021-02-01 14:14:43 UTC
Yes, LLVM 12 should have all the required patches.

Comment 3 Ben Cotton 2021-11-04 16:10:19 UTC
This message is a reminder that Fedora 33 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora 33 on 2021-11-30.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
Fedora 'version' of '33'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version' 
to a later Fedora version.

Thank you for reporting this issue and we are sorry that we were not 
able to fix it before Fedora 33 is end of life. If you would still like 
to see this bug fixed and are able to reproduce it against a later version 
of Fedora, you are encouraged  change the 'version' to a later Fedora 
version prior this bug is closed as described in the policy above.

Although we aim to fix as many bugs as possible during every release's 
lifetime, sometimes those efforts are overtaken by events. Often a 
more recent Fedora release includes newer upstream software that fixes 
bugs or makes them obsolete.

Comment 4 Ben Cotton 2021-11-30 17:52:40 UTC
Fedora 33 changed to end-of-life (EOL) status on 2021-11-30. Fedora 33 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen this bug against that version. If you
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current release. If you experience problems, please add a comment to this
bug.

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