Is it normal that std::println bloats my binary ? Is it normal that -O0 binary is shorter than -03?

1 day ago 2

ARTICLE AD BOX

I was playing on https://godbolt.org/ and kinda wanted to check what assembly is produced when using std::println...
I was suprised that just for this really simple program, (compiled for x86_64):

#include <print> auto main() -> int { std::println("Hello World"); return 0; }

The binary generated by GCC (15.2, Trunk) and clang (21.1) are like 5000+ lines of assembly....
optimizer can't help. Would it be compiled with -O0 or -O3 the result is roughly the same....

When using iostream :

#include <iostream> auto main() -> int { std::cout << "Hello World" << std::endl; return 0; }

-> I get a binary of ~40 lines of assembly with -O3
-> I get a binary of ~15 lines of assembly with -O0.

I find all this really confusing...
I mean having a shorter binary with less optimization feels a bit off....
And having println generating 5000 lines of assembly seems a bit too much.
In fact i'm actually wondering if println is usable at all, then....

I know it's like 2 questions in the same post but all this confused me a lot....

Thanks in advance