How Can I Efficiently Link Dependent Static Libraries in a New Static Library?

Linking Static Libraries: The Challenge of Embedded Dependencies

When building modular codebases composed of several static libraries, a common problem arises: linking dependent libraries within a newly created static library. This obstacle stems from the nature of static libraries, which encapsulate object files without incorporating dependencies.

Creating a "Wrapper" Library

To solve this issue, one can create a "wrapper" static library (e.g., Y) that encompasses the desired static library (X) and selected functionality from external libraries (a_1 - a_n). By combining these elements within a single archive, the wrapper library effectively provides all the necessary components for using X.

Merging Libraries with 'ar'

A straightforward method to create the wrapper library involves utilizing the 'ar' command to concatenate the libraries. This approach does not, however, address the issue of including unnecessary symbols. Since static libraries generally contain all object files, the resulting merged library may include symbols that are not required for X.

Selective Inclusion: A Complex Task

Identifying and selecting only those symbols necessary for X can be a time-consuming and error-prone process. It requires manually building a library from a curated set of object files. While the existence of automated tools for this purpose is not known, it presents an intriguing project opportunity.

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