[NVPTX][Tests] Avoid writing test output to readonly dir

[rupprecht]

Omitting -o /dev/null may try to write output to the current dir, which may not have write permissions on some build systems.

This fixes the test added by #165737

[llvmbot]

@llvm/pr-subscribers-backend-nvptx

Author: Jordan Rupprecht (rupprecht)

Changes

Omitting -o /dev/null may try to write output to the current dir, which may not have write permissions on some build systems.

---

Full diff: https://github.com/llvm/llvm-project/pull/166404.diff

1 Files Affected:

• (modified) llvm/test/CodeGen/NVPTX/cmpxchg-unsupported-syncscope.err.ll (+1-1)

diff --git a/llvm/test/CodeGen/NVPTX/cmpxchg-unsupported-syncscope.err.ll b/llvm/test/CodeGen/NVPTX/cmpxchg-unsupported-syncscope.err.ll
index d3853e2fdaa88..4d81fdc67736d 100644
--- a/llvm/test/CodeGen/NVPTX/cmpxchg-unsupported-syncscope.err.ll
+++ b/llvm/test/CodeGen/NVPTX/cmpxchg-unsupported-syncscope.err.ll
@@ -1,4 +1,4 @@
-; RUN: not llc -mcpu=sm_100a -mtriple=nvptx64 -mattr=+ptx86 %s 2>&1 | FileCheck %s
+; RUN: not llc -mcpu=sm_100a -mtriple=nvptx64 -mattr=+ptx86 %s -o /dev/null 2>&1 | FileCheck %s
 
 ; Test that we get a clear error message when using an unsupported syncscope.
 

[smada3]

LGTM