Library with global_asm Emits Link Error

I'm coding a library for my no_std environment, and it includes global_asm!.
When I compile it with cargo build --release, emitted .rlib file includes those assembly and the symbols.
When I use it other binary crates, however, the compiler tells me there is no symbol I declared in global_asm!.
What's the problem?

I was wrong. Just forgot .global <func_name> in assembly.

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