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C++ Static and Dynamic Linking

1. Overview

This repository has code to demonstrate:

  • How to link libraries statically and dynamically using g++ or CMake.
  • How to resolve the linking errors when linking boost::log statically.
  • How the linker resolves the symbols when linking object files and static libraries.

2. Static & Dynamic Linking

The code is in the current directory.

The run-g++ shell scripts show how to link libraries in different ways:

Script Description
run-g++-both-force-static.sh How to force static linking when both static and dynamic libraries are present.
run-g++-dynamic.sh How to link dynamic libraries only.
run-g++-mix.sh How to mix the static and dynamic linking.
run-g++-static.sh How to link static libraries only.

The CMakeLists.txt has code that does the same using CMake.

3. Static Linking Errors in boost::log

This sub-directory addresses the problem that building programs with boost::log in CMake with static linking may result in link errors.

The code is in the sub-directory boost_log. See the README.md for more details.

4. Library Order in Static Linking

This sub-directory is an additional resource of understanding the article Library order in static linking which helps you to understand why link errors happens on static libraries and how to debug them.

The code is in the sub-directory library-order-in-static-linking. See the README.md for more details.