[test] Avoid writing test output to readonly dir (llvm#166404)

rupprecht · web-flow · commit 8aff0d99d608 · 2025-11-04T17:54:43.000Z
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 llvm#165737
diff --git 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.
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-; RUN: not llc -mcpu=sm_100a -mtriple=nvptx64 -mattr=+ptx86 %s 2>&1 \| FileCheck %s`
	`1`	`+; RUN: not llc -mcpu=sm_100a -mtriple=nvptx64 -mattr=+ptx86 %s -o /dev/null 2>&1 \| FileCheck %s`
`2`	`2`
`3`	`3`	`; Test that we get a clear error message when using an unsupported syncscope.`
`4`	`4`