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libc++'s stddef.h uses non-standard macros to detect if max_align_t exists,
which break on musl. We reluctantly add musl's non-public macro the list
for now, but this should be fixed more fundamentally.
diff --git a/libcxx/include/stddef.h b/libcxx/include/stddef.h
index 8841bbe..faf8552 100644
--- a/libcxx/include/stddef.h
+++ b/libcxx/include/stddef.h
@@ -53,7 +53,8 @@ using std::nullptr_t;
}
// Re-use the compiler's <stddef.h> max_align_t where possible.
-#if !defined(__CLANG_MAX_ALIGN_T_DEFINED) && !defined(_GCC_MAX_ALIGN_T)
+#if !defined(__CLANG_MAX_ALIGN_T_DEFINED) && !defined(_GCC_MAX_ALIGN_T) && \
+ !defined(__DEFINED_max_align_t)
typedef long double max_align_t;
#endif
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