Clang compile issue

[Maturin]

When including the utf.h directly or indirectly in my code, I get this error message - at least when compiling the code with Clang 20.

.../MicrosoftCompoundFileReader/include/compoundfilereader/utf.h:52:12: error: 'static' function 'CodePointToUTF8' declared in header file should be declared 'static inline' [-Werror,-Wunneeded-internal-declaration]
   52 | static int CodePointToUTF8(uint32_t cp, uint32_t* c1, uint32_t* c2, uint32_t* c3, uint32_t* c4)
      |            ^~~~~~~~~~~~~~~
1 error generated.

The function is comparably small, so changing static to static inline as suggested by clang, would be an option.

But I am wondering, if declaring the function simple as inline would be sufficient. Then the compiler/linker can decide if it is inlined or a single instance of the function is linked. (Contrary to static inline, which would result in one function for each compilation unit, which includes the function.)