> Date: Sat, 13 Apr 2024 02:15:33 +0200
> From: Christian Weisgerber <naddy@mips.inka.de>
> 
> Philip Guenther:
> 
> > > I believe that macros like htonl don't need functions, but this
> > > diff is correct to keep a function which already exists.
> > 
> > Unless explicitly specified as a macro, POSIX requires all functional
> > interfaces to have a function prototype and external symbol.
> 
> We only have htonl() etc. as macros and that is permitted by POSIX:
> "On some implementations, these functions are defined as macros."
> 
> We don't have any prototype for htonl() in our headers.
> 
> If you want to get at the functions in libc, you need to #undef
> htonl (or avoid including any headers that pull in the macro), and
> provide your own prototype.
> 
> Importantly, my proposed diff doesn't change any of that.

And that is the right approach I think.