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

[Paul Kirth via cfe-commits]

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

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.

>From b392334bc6be0262ca734d3791a87afeac4cab41 Mon Sep 17 00:00:00 2001
From: Paul Kirth <paulkirth at google.com>
Date: Thu, 10 Apr 2025 13:48:37 -0700
Subject: [PATCH] [clang][test][NFC] Use -fdriver-only over /dev/null

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.
---
 clang/test/Driver/openacc-no-cir.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

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