[clang] [test][clang][AArch64] Don't assume current dir is writeable (PR #119285)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Jordan Rupprecht (rupprecht)

<details>
<summary>Changes</summary>

afa2fbf87a8e3fff609fd325c938929c48e94280 adds a test which can fail with `error: unable to open output file 'fixed-register-global.o': 'Permission denied'`. We don't check the output file at all, so just use /dev/null.

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Full diff: https://github.com/llvm/llvm-project/pull/119285.diff


1 Files Affected:

- (modified) clang/test/CodeGen/AArch64/fixed-register-global.c (+3-3) 


``````````diff
diff --git a/clang/test/CodeGen/AArch64/fixed-register-global.c b/clang/test/CodeGen/AArch64/fixed-register-global.c
index a5e634310ec941..25c7aa254547be 100644
--- a/clang/test/CodeGen/AArch64/fixed-register-global.c
+++ b/clang/test/CodeGen/AArch64/fixed-register-global.c
@@ -2,13 +2,13 @@
 /// Regression test for #76426, #109778
 // REQUIRES: aarch64-registered-target
 
-// RUN: %clang -c --target=aarch64-none-gnu -ffixed-x15 %s 2>&1 | count 0
+// RUN: %clang -c --target=aarch64-none-gnu -ffixed-x15 %s -o /dev/null 2>&1 | count 0
 
-// RUN: not %clang -c --target=aarch64-none-gnu %s 2>&1 | \
+// RUN: not %clang -c --target=aarch64-none-gnu %s -o /dev/null 2>&1 | \
 // RUN:   FileCheck %s --check-prefix=ERR_INVREG
 // ERR_INVREG: error: register 'x15' unsuitable for global register variables on this target
 
-// RUN: not %clang -c --target=aarch64-none-gnu -ffixed-x15 -DTYPE=short %s 2>&1 | \
+// RUN: not %clang -c --target=aarch64-none-gnu -ffixed-x15 -DTYPE=short %s -o /dev/null 2>&1 | \
 // RUN:   FileCheck %s --check-prefix=ERR_SIZE
 // ERR_SIZE: error: size of register 'x15' does not match variable size
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/119285