a.cpp

#include <random>

int main()
{
}

b.cpp

#include <random>

build.log

b.o: In function `std::experimental::fundamentals_v2::reseed()':
b.cpp:(.text+0x2670): multiple definition of `std::experimental::fundamentals_v2::reseed()'
a.o:a.cpp:(.text+0x26b0): first defined here
b.o: In function `std::experimental::fundamentals_v2::reseed(unsigned int)':
b.cpp:(.text+0x27d0): multiple definition of `std::experimental::fundamentals_v2::reseed(unsigned int)'
a.o:a.cpp:(.text+0x2810): first defined here

build.sh

#/bin/bash

nc++ -std=c++17 -c a.cpp
nc++ -std=c++17 -c b.cpp
nc++ a.o b.o