alt Hacker News> On that note: GCC doesn't provide a nice library to give access to its internals (unlike LLVM). So we have to use libgccjit which, unlike the "jit" ("just in time", meaning compiling sub-parts of the code on the fly, only when needed for performance reasons and often used in script languages like Javascript) part in its name implies, can be used as "aot" ("ahead of time", meaning you compile everything at once, allowing you to spend more time on optimization).
Is libgccjit not “a nice library to give access to its internals?”
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I could be wrong, but my surface level understanding is that it's more of a library version of the external API of GCC than one that gives access to the internals.
libgccjit is much higher level than what's documented in the "GCC Internals" manual.
To use an illustrative (but inevitably flawed) metaphor: Using libgccjit for this is a bit like networking two computers via the MIDI protocol.
The MIDI protocol is pretty good for what it is designed for, and you can make it work for actual real networking, but the connections will be clunky, unergonomic, and will be missing useful features that you really want in a networking protocol.