[moefh]

> It probably shouldn't do that if you create a dynamic library that needs a symbol table but for an ELF binary it could, no?

It can't do that because the program might load a dynamic library that depends on the function (it's perfectly OK for a `.so` to depend on a function from the main executable, for example).

That's one of the reasons why a very cheap optimization is to always use `static` for functions when you can. You're telling the compiler that the function doesn't need to be visible outside the current compilation unit, so the compiler is free to even inline it completely and never produce an actual callable function, if appropriate.

[bruce343434]

Sadly most C++ projects are organized in a way that hampers static functions. To achieve incremental builds, stuff is split into separate source files that are compiled and optimized separately, and only at the final step linked, which requires symbols of course.

I get it though, because carefully structuring your #includes to get a single translation unit is messy, and compile times get too long.

[cyco130]

That’s where link-time optimization enters the picture. It’s expensive but tolerable for production builds of small projects and feasible for mid-sized ones.

[1718627440]

That's one major reason why I don't like C++. I think the concept of header and implementation files is fine, but idiomatic C++ code basically makes it broken. Surely a class should go into the implementation file? (Internal) Types belong into the implementation, what belongs into headers are interfaces and function signatures. A class is a type, so it does not belong into a header file.

[gpderetta]

[[gnu::visibility(hidden)]] (or the equivalent for your compiler), might help.

[sureglymop]

> It can't do that because the program might load a dynamic library that depends on the function

That makes perfect sense, thank you!

And I just realized why I was mistaken. I am using fasm with `format ELF64 executable` to create a ELF file. Looking at it with a hex editor, it has no sections or symbol table because it creates a completely stripped binary.

Learned something :)