[libunwind] [libunwind][WebAssembly] Don't build libunwind.cpp (PR #73196)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libunwind

Author: Heejin Ahn (aheejin)

<details>
<summary>Changes</summary>

Wasm doesn't use that file; Wasm does not allow access of system registers and those functionalities are provided from the VM. Wasm only uses
https://github.com/llvm/llvm-project/blob/main/libunwind/src/Unwind-wasm.c, which implements a few interface functions.

---
Full diff: https://github.com/llvm/llvm-project/pull/73196.diff


1 Files Affected:

- (modified) libunwind/src/libunwind.cpp (+3-2) 


``````````diff
diff --git a/libunwind/src/libunwind.cpp b/libunwind/src/libunwind.cpp
index 1bd18659b7860c0..cd610377b63de8d 100644
--- a/libunwind/src/libunwind.cpp
+++ b/libunwind/src/libunwind.cpp
@@ -26,7 +26,7 @@
 #include <sanitizer/asan_interface.h>
 #endif
 
-#if !defined(__USING_SJLJ_EXCEPTIONS__)
+#if !defined(__USING_SJLJ_EXCEPTIONS__) || !defined(__USING_WASM_EXCEPTIONS__)
 #include "AddressSpace.hpp"
 #include "UnwindCursor.hpp"
 
@@ -347,7 +347,8 @@ void __unw_remove_dynamic_eh_frame_section(unw_word_t eh_frame_start) {
 }
 
 #endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
-#endif // !defined(__USING_SJLJ_EXCEPTIONS__)
+#endif // !defined(__USING_SJLJ_EXCEPTIONS__) ||
+       // !defined(__USING_WASM_EXCEPTIONS__)
 
 #ifdef __APPLE__
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/73196