Hello ,
actually, I'd like to know if you knew (or designed) a compiler for a high-level language, preferably C or C++, with FASM as the target assembly language?

That might be interesting.

Thank you, and good day

Moved to HLL forum.

Some compilers support "intel syntax" generation. Don't know how close it is.

All assemblers work according to the same principle, so it shouldn't be very different, indeed; however FASM uses macros, "proc" (so process I imagine), preprocessor instructions, segments,...
For example, when I go to this site (https://godbolt.org), a simple little program in C or C++ gives me a code x86-64 according to the gcc compiler; and it still seems quite different from FASM.

No, no compiler generates assembly with fasm macros. At least I'm not aware of that. They usually use labels and such.

PureBasic has been using fasm since early 2000's and it is perhaps the most "professional" compiler that uses fasm for this purpose. There were many other smaller ones, but mostly a hobby projects. For example Simple C had been once converted to use fasm.

Thanks to you for the information

You can find a couple more on this very forum, for example Flat C--.

Ha! Thank you very much, that's exactly what I expected

I'm surprised nobody mentioned yet SmallerC (try "-asm n2f" since NASM is default).

Okay thanks to you too