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-rw-r--r--libcxx/include/__configuration/abi.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/libcxx/include/__configuration/abi.h b/libcxx/include/__configuration/abi.h
index 2d33b9c..c9936df 100644
--- a/libcxx/include/__configuration/abi.h
+++ b/libcxx/include/__configuration/abi.h
@@ -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 Itanium ABI with a few differences (array cookies, etc),
+// and so does 64-bit ARM on Apple platforms.
+# elif defined(__arm__) || (defined(__APPLE__) && defined(__aarch64__))
+# define _LIBCPP_ABI_ITANIUM_WITH_ARM_DIFFERENCES
+
+// Non-Apple 64-bit ARM uses the vanilla Itanium ABI
+# elif defined(__aarch64__)
+# define _LIBCPP_ABI_ITANIUM
+
+// We assume that other architectures also use the vanilla Itanium ABI too
# else
# define _LIBCPP_ABI_ITANIUM
# endif