[clang] [Driver] Default Generic_GCC aarch64_be to -fasynchronous-unwind-tables (PR #72971)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang-driver

@llvm/pr-subscribers-clang

Author: dong jianqiang (dongjianqiang2)

<details>
<summary>Changes</summary>

This patch defaults Generic_GCC aarch64_be to use -fasynchronous-unwind-tables and ensures consistent behavior with aarch64 little endian.

---
Full diff: https://github.com/llvm/llvm-project/pull/72971.diff


2 Files Affected:

- (modified) clang/lib/Driver/ToolChains/Gnu.cpp (+1) 
- (modified) clang/test/Driver/aarch64-features.c (+1) 


``````````diff
diff --git a/clang/lib/Driver/ToolChains/Gnu.cpp b/clang/lib/Driver/ToolChains/Gnu.cpp
index 2b1e8f02cf66388..782618236ff8982 100644
--- a/clang/lib/Driver/ToolChains/Gnu.cpp
+++ b/clang/lib/Driver/ToolChains/Gnu.cpp
@@ -2937,6 +2937,7 @@ ToolChain::UnwindTableLevel
 Generic_GCC::getDefaultUnwindTableLevel(const ArgList &Args) const {
   switch (getArch()) {
   case llvm::Triple::aarch64:
+  case llvm::Triple::aarch64_be:
   case llvm::Triple::ppc:
   case llvm::Triple::ppcle:
   case llvm::Triple::ppc64:
diff --git a/clang/test/Driver/aarch64-features.c b/clang/test/Driver/aarch64-features.c
index a797cc0cf9084c2..d2075c91314a8b2 100644
--- a/clang/test/Driver/aarch64-features.c
+++ b/clang/test/Driver/aarch64-features.c
@@ -1,4 +1,5 @@
 // RUN: %clang --target=aarch64-none-linux-gnu -### %s -fsyntax-only 2>&1 | FileCheck %s
+// RUN: %clang --target=aarch64_be-none-linux-gnu -### %s -fsyntax-only 2>&1 | FileCheck %s
 // RUN: %clang --target=arm64-none-linux-gnu -### %s -fsyntax-only 2>&1 | FileCheck %s
 
 // CHECK: "-funwind-tables=2"

``````````

</details>


https://github.com/llvm/llvm-project/pull/72971