Index: llvm-toolchain-snapshot_17~++20230530094321+b187215a44f7/libcxx/include/__mbstate_t.h
===================================================================
--- llvm-toolchain-snapshot_17~++20230530094321+b187215a44f7.orig/libcxx/include/__mbstate_t.h
+++ llvm-toolchain-snapshot_17~++20230530094321+b187215a44f7/libcxx/include/__mbstate_t.h
@@ -35,7 +35,11 @@
 #  define __CORRECT_ISO_CPP_WCHAR_H_PROTO
 #endif
 
-#if __has_include(<bits/types/mbstate_t.h>)
+
+#if __has_include(<bits/alltypes.h>)  // Probe for musl
+#define __NEED_mbstate_t  // Tell musl we need __mbstate_t (and nothing else)
+#include <bits/alltypes.h>
+#elif __has_include(<bits/types/mbstate_t.h>)
 #   include <bits/types/mbstate_t.h> // works on most Unixes
 #elif __has_include(<sys/_types/_mbstate_t.h>)
 #   include <sys/_types/_mbstate_t.h> // works on Darwin