Clang precompiled header not find header

Clang Frontend
1

I use this command line to precompiled header.

clang -x c-header pch.h -o pch.h.pch -v

return

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The iostream path is usr/include/c++/9/iostream.
Why clang not find this header?

2

I should use ‘c++ -header’ ,not ‘c-header’.