Consider introducing wasmtime specific header for the library distribution

[rene-fonseca]

It would be nice to have version/compatibility info available via a header when consuming the wasmtime library. I use such version defines to automatically tag the the binaries built (e.g. allows future security issues to be detected automatically).

E.g. look at ZLIB library header for useful info.

#define ZLIB_VERSION "1.2.11"
#define ZLIB_VERNUM 0x12b0
#define ZLIB_VER_MAJOR 1
#define ZLIB_VER_MINOR 2
#define ZLIB_VER_REVISION 11
#define ZLIB_VER_SUBREVISION 0

I then consume info at compile time like this:
https://github.com/rene-fonseca/base/blob/9d478d34a6ac3b1661b781a97dd8c90610ae5428/base/compression/ZLibInflater.cpp#L65-L67

[yurydelendik]

Is this issue limited only to C API packages?

[rene-fonseca]

Not sure how non-C environments work. Maybe info could be available to C#/Rust too.

But I was thinking about C-API. But not specific to WASI C-API - since it is really the runtime info I'm looking for here - ie. the wasmtime implementation.

[plicease]

For FFI it would be helpful to have a wasmtime_version() function for diagnostics that returned a string with the wasmtime version for taged releases, and the git commit id for dev releases.

Adding this information as #defines to the header is useful for C/C++, but not for languages that use FFI based on libffi or similar.

[bjorn3]

I think this is a duplicate of #5635 which was fixed in #5651.