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serenity/Toolchain/Stubs/README.md
Daniel Bertalan c524f58290 Toolchain: Introduce stubs for core system libraries 
This allows the linker to link against these dynamic libraries when
compiling libc++/libunwind, without having to do a separate
bootstrapping LibC build.

Without this change, libc++ would fail to pick up the need to link to
`LibPthread` if no prior builds of it existed. Because of this, we'd
immediately have an assertion failure in SystemServer, as mutexes are
used for the safe construction of function-local static variables.
2021-10-17 17:09:58 +01:00

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Library stubs

This directory contains stubs for SerenityOS libraries (LibC, LibM, LibDl, LibPthread) that are referenced from the LLVM runtime libraries. These are needed by the linker in order to add the required DT_NEEDED entries.

Do these need to be updated?

Generally, no. LLVM does not use the header files to decide which functionality it can use. After adding a new function to a header, you don't have to worry about LLVM toolchain builds failing because the symbol is not present in the stubs.

How to generate these?

First, you need to have a working SerenityOS installation that's been built by the Clang toolchain. Then, using the llvm-ifs tool, these libraries need to be converted into a stripped-down stub form. To do that, run the following command:

Toolchain/Local/clang/bin/llvm-ifs --output-format=ELF --output=<path-to-stub> <path-to-original>