test.py

import subprocess
import tempfile
import os
import re
from string import Template

STRING = """
#include <iostream>
#include <string>

#define STR(x) std::cout << #x"=" << x << std::endl

#include "$header_file"

int main()
{
    $main
}
"""

names = []
with open("test.hpp", "r") as fp:
    for line in fp.readlines():
        match = re.match(r"^\s*#define\s+\b(\w+)\b", line)
        if match:
            names.append(match.group(1))

main = ""
for name in names:
    main = main + "STR(" + name + "); "

t = Template(STRING)
string = t.substitute(header_file="test.hpp", main=main)

with open("main.c", "w") as fp:
    fp.write(string)

p = subprocess.Popen(["g++", "-o", "main", "-xc++", "main.c"], stdout=subprocess.PIPE)
out, error = p.communicate()

p = subprocess.Popen(["./main"], stdout=subprocess.PIPE)
out, error = p.communicate()
print(out)