[clang] [Driver] Fix the sysroot.c test properly (PR #94276)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Paul T Robinson (pogo59)

<details>
<summary>Changes</summary>

A DEFAULT_SYSROOT interfered with the test, apparently. See #<!-- -->95055.

---
Full diff: https://github.com/llvm/llvm-project/pull/94276.diff


1 Files Affected:

- (modified) clang/test/Driver/sysroot.c (+2-4) 


``````````diff
diff --git a/clang/test/Driver/sysroot.c b/clang/test/Driver/sysroot.c
index 2215d6fa8fe73..85da2499090af 100644
--- a/clang/test/Driver/sysroot.c
+++ b/clang/test/Driver/sysroot.c
@@ -1,15 +1,13 @@
-// Fails on ARM/AArch64-hosted Windows, can't tell why.
-// UNSUPPORTED: system-windows
-
 // Check that --sysroot= also applies to header search paths.
 // RUN: %clang -target i386-unk-unk --sysroot=/FOO -### -E %s 2> %t1
 // RUN: FileCheck --check-prefix=CHECK-SYSROOTEQ < %t1 %s
 // CHECK-SYSROOTEQ: "-cc1"{{.*}} "-isysroot" "{{[^"]*}}/FOO"
 
 // Apple Darwin uses -isysroot as the syslib root, too.
+// We pass --sysroot="" to defeat any -DDEFAULT_SYSROOT parameter.
 // RUN: touch %t2.o
 // RUN: %clang -target i386-apple-darwin10 \
-// RUN:   -isysroot /FOO -### %t2.o 2> %t2
+// RUN:   -isysroot /FOO --sysroot="" -### %t2.o 2> %t2
 // RUN: FileCheck --check-prefix=CHECK-APPLE-ISYSROOT < %t2 %s
 // CHECK-APPLE-ISYSROOT: "-arch" "i386"{{.*}} "-syslibroot" "{{[^"]*}}/FOO"
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/94276