As far as I can tell, it looks like a wrapper for cc1plus (internal GCC tool) and ld that do a custom #define of some input data, compile, extract some data from the binary, and do... something with it. Makes it look like C++ is an interpreted language.
Implementations are orthogonal to languages, there have been C and C++ interpreters since the languages exist, as you can see by looking at BYTE and Dr Dobbs archives looking for compiler developer tools ads.
But some are more suited then others. For example, I believe the C standard to not describe what is supposed to happen when the definition of a function changes.
It doesn't have to, that is an implementation detail or OS specific feature.
Two scenarios where the definition of a function in C changes, are dynamic libraries on OSes that allow reloading the same library multiple times, or self-rewriting code.
Here you stay within the realms of a compiled language implementation, where what happens, is only expecified by compiler specific features, or OS capabilities handling executables and dynamic libraries.
Yes, but it suddenly matters if you execute code in an interpreter, where the user can change any symbol/function definition at anytime. What do you do with a a struct definition, that changes? Do all the functions return something different now? Or does the return type of all the functions change to an anon struct and the name now refers to something different. Stuff like that is what the distinction is between a compiled and an interpreted language.
The same way you deal with them as they come from a dynamic library, and the code gets reloaded on the fly, like on game engines that use compiled C and C++ instead of whatever scripting language.
Compiled code with dynamic replacement during execution,
C++ is considered to be a typically compiled language by the majority of people. But you’re right, I should have said that it makes GCC look like a C++ interpreter.
This video doesn't explain what the project does and how it does it. Also it's deliberately misleading the viewer, for example it purposefully incorrectly states that C++ is an interpreted language.
The video is a compliment to the Github repository, the presenter even shows code and brings up the repo in the video. I guess you didn't watch that part and unfortunately you didn't get the joke either.