[clang] [clang][test][NFC] Use -fdriver-only over /dev/null (PR #135255)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Paul Kirth (ilovepi)

<details>
<summary>Changes</summary>

Tests should avoid using platform dependent behavior, like /dev/null
when possible. -fdriver-only should stop clang even earlier, and avoid
any non-diagnostic output.

---
Full diff: https://github.com/llvm/llvm-project/pull/135255.diff


1 Files Affected:

- (modified) clang/test/Driver/openacc-no-cir.c (+3-3) 


``````````diff
diff --git a/clang/test/Driver/openacc-no-cir.c b/clang/test/Driver/openacc-no-cir.c
index 891f175a001bb..5fa1e4e0c809f 100644
--- a/clang/test/Driver/openacc-no-cir.c
+++ b/clang/test/Driver/openacc-no-cir.c
@@ -1,6 +1,6 @@
-// RUN: %clang -fopenacc -S %s -o /dev/null 2>&1 | FileCheck %s -check-prefix=ERROR
-// RUN: %clang -fclangir -fopenacc -S %s -o /dev/null 2>&1 | FileCheck %s --allow-empty -check-prefix=NOERROR
-// RUN: %clang -fopenacc -fclangir -S %s -o /dev/null 2>&1 | FileCheck %s --allow-empty -check-prefix=NOERROR
+// RUN: %clang -fopenacc -S %s -o -fdriver-only 2>&1 | FileCheck %s -check-prefix=ERROR
+// RUN: %clang -fclangir -fopenacc -S %s -fdriver-only 2>&1 | FileCheck %s --allow-empty -check-prefix=NOERROR
+// RUN: %clang -fopenacc -fclangir -S %s -fdriver-only 2>&1 | FileCheck %s --allow-empty -check-prefix=NOERROR
 
 // ERROR: OpenACC directives will result in no runtime behavior; use -fclangir to enable runtime effect
 // NOERROR-NOT: OpenACC directives

``````````

</details>


https://github.com/llvm/llvm-project/pull/135255