[libcxx-commits] [libcxx] [libc++] Properly implement array cookies in the ARM ABI (PR #160182)

[Louis Dionne via libcxx-commits]

================
@@ -30,8 +30,20 @@
 #elif _LIBCPP_ABI_FORCE_MICROSOFT
 #  define _LIBCPP_ABI_MICROSOFT
 #else
+// Windows uses the Microsoft ABI
 #  if defined(_WIN32) && defined(_MSC_VER)
 #    define _LIBCPP_ABI_MICROSOFT
+
+// 32-bit ARM uses the ARM ABI with a few oddities (array cookies, etc),
+// and so does 64-bit ARM on Apple platforms.
+#  elif defined(__arm__) || (defined(__APPLE__) && defined(__aarch64__))
+#    define _LIBCPP_ABI_ARM_WITH_32BIT_ODDITIES
----------------
ldionne wrote:

Exceptions as in differences, not as in `try catch`, right? In that case, what about `_LIBCPP_ABI_ITANIUM_WITH_ARM_DIFFERENCES`?

https://github.com/llvm/llvm-project/pull/160182