What happens before main in C++?

Question

I know in C, before application can get started in main(), some entity must:

1. Initialize Global variables
2. Set the stack pointer to the lo

Answer 1

In this answer I have investigated the entry point location for a C program: Is main() really start of a C++ program?

When I do an analogous analysis for C++, the results are basically the same, and as others mentioned, it is part of glibc with backtrace at main:

#0  main () at hello.cpp:3
#1  0x00007ffff7be50b3 in __libc_start_main (main=0x5555555551a9 , argc=1, argv=0x7fffffffbfb8, init=, fini=, rtld_fini=, stack_end=0x7fffffffbfa8) at ../csu/libc-start.c:308
#2  0x00005555555550ee in _start ()

so the exact same line as that of a C program.

I think the C++ compiler is just calling into hooks to achieve any C++ specific functionality, and things are pretty well factored across C/C++.