cross-arm-gcc-wrapper.py

#!/usr/bin/python3

# First, find what real compiler is called, symlink destination: ls -l /usr/bin/armv7hl-unknown-linux-gnueabi-gcc
# /usr/bin/armv7hl-unknown-linux-gnueabi-gcc: symbolic link to \
#   /usr/x86_64-pc-linux-gnu/armv7hl-unknown-linux-gnueabi/gcc-bin/7.3.0/armv7hl-unknown-linux-gnueabi-gcc

# So, we go and replace "/usr/bin/armv7hl-unknown-linux-gnueabi-gcc" with this script and make it executable.
# Then when this script is called instead of a real compiler, it would replace all parameters '-L/usr/lib64'
#    to correct ones: '-L/usr/armv7hl-unknown-linux-gnueabi-gcc/lib' to prevent linking to wrong libs from host.

import sys
import os
import subprocess

orig_gcc = '/usr/x86_64-pc-linux-gnu/armv7hl-unknown-linux-gnueabi/gcc-bin/7.3.0/armv7hl-unknown-linux-gnueabi-gcc'
new_argv = []

# Go through all commandl-line arguments and copy them to new array, replacing incorrect ones
for arg in sys.argv:
    if arg == '-L/usr/lib64':
        arg = '-L/usr/armv7hl-unknown-linux-gnueabi-gcc/lib'
    new_argv.append(arg)

# First item in argv is always a name of an executable, so replace it with real executable name
new_argv[0] = orig_gcc

# Call original compiler with new set of parameters
sys.exit(subprocess.call(new_argv))