Building Git

We build Git for Windows using MSys2.

As we are in the process of switching away from msysGit as our development environment, the following instructions are a little rough on the edges. This situation should become better over the next months.

Installing a build environment

1. Install MSys2 from https://msys2.github.io/, into C:/msys32 and C:/msys64 (if you only want to build for one architecture, you can skip the other one). This will install three Shells into the Start Menu: the MSys, the MinGW 32 and the MinGW 64 Shell. To build Git, you should start the MinGW shell corresponding to the architecture of the installed MSys2.

2. Download and run this file in a cmd window in the top-level MSys2 directory (you need to close all MSys2 windows before that, so that the msys-2.0.dll file can be updated).

Build Git

1. Clone Git: cd /usr/src/ && git clone https://github.com/git-for-windows/git.

2. Temporarily: In /usr/src/git/, check out the update-to-2.3.0 branch: git remote add -f dscho https://github.com/dscho/git && git checkout -t dscho/update-to-2.3.0.

3. Build Git: make.

4. Run the test suite: make test

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Note: if you encounter messages like 39 [main] make 7628 child_info_fork::abort:... while running make, follow the following MSYS2 Issue post, in short: close all MSys2 windows and run the autorebase.bat script in the top-level MSys2 directory from a cmd.

Build the msys2-⁠runtime

1. Install the MSys2 Toolchain: pacman -⁠S gcc binutils make.

2. Clone the MSYS2-packages repository: cd /usr/src && git clone https://github.com/git-for-windows/MSYS2-packages.

3. Temporarily: In MSYS2-packages, check out the msys-runtime branch: git remote add -f dscho https://github.com/dscho/MSYS2-packages && git checkout -t dscho/msys-runtime.

4. Build the package: makepkg -⁠s.

(You might need to call pacman -S ca-certificates to reinstall that package, it seems that it was not installed properly at least in one MSys2 32-bit setup.)