Never use git submodules

tl;dr

git submodules are always the wrong solution. Yes, even the to the problem they were specifically invented to solve.

• What is wrong with git submodules
• Better alternatives to git submodules
  • Use git subtree
  • Just have a monorepo
  • Use a package management system, and explicit dependencies
  • Use the multiple repository tool mr
  • Have your build expect to find the dependency in .., its parent dir
  • Provide an ad-hoc in-tree script to download the dependency

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