IBAMR: Dropping Autotools For A Smoother Build Process

Hey everyone, let's talk about something that's been on our minds regarding IBAMR: the autotools build system. We've been wrestling with it, and it's time for a change. After the next release, we're planning to ditch autotools and focus solely on CMake. This decision comes after careful consideration of its limitations and the benefits of streamlining our build process. It's all about making life easier for everyone involved in IBAMR, from seasoned developers to newcomers.

The Autotools Headache: Unresolved Bugs and Frustrations

Autotools, while a tried-and-true system, has been causing us some grief lately. We've encountered several persistent issues that have made our development process less efficient and, frankly, a bit frustrating. The core problems revolve around limitations in dynamic linking and the absence of a proper make install feature. These issues create bottlenecks and hinder the overall usability of the system. Imagine trying to build and install your software, and the basic installation command just doesn't work! That's the reality with autotools, and it's something we need to address to improve the developer experience. Plus, it is too easy to add things to one build system and forget to add it to the other (we should automatically check).

The Problem with Dynamic Linking

One of the most significant drawbacks of autotools in IBAMR is the lack of robust dynamic linking support. Dynamic linking is crucial for creating modular and flexible software. It allows us to load libraries at runtime, which is essential for many of the advanced features we want to implement in IBAMR. Without it, we're stuck with static linking, which creates larger executables and makes it more difficult to manage dependencies. It is also hard to work with others without the dynamic linking.

The Absence of make install

The absence of a reliable make install command is another major pain point. This command is fundamental for packaging and distributing software. It's what allows users to easily install IBAMR on their systems and get started quickly. Without it, we have to rely on manual installation procedures, which are time-consuming, error-prone, and not user-friendly. We need a proper installation process to make sure our users can effortlessly set up and use IBAMR.

Documentation and Newcomer Hurdles

Furthermore, the documentation surrounding autotools, especially for those new to IBAMR, is not great. This lack of clarity can be a real barrier for newcomers, particularly students who are just getting their feet wet in the world of scientific computing. It's crucial that we provide clear, concise documentation that guides them through the build process and helps them understand how to contribute effectively to the project. The question is, who is going to take the responsibility to assist all the students and show them how to regenerate the build system? This is a lot of work and responsibility, and it needs to be solved so that they can quickly understand and use IBAMR. We want to make sure everyone is able to easily install and use the program, regardless of experience level.

Poor Performance: A Minute for Configure, Seconds for CMake

Performance is another key concern. The configure step in autotools takes a significant amount of time, sometimes up to a minute. This is in stark contrast to CMake, which completes the configuration phase in mere seconds. The performance difference might seem trivial at first glance, but it adds up, especially when developers are repeatedly building and testing code. Every second counts, and we need to streamline our workflow to maximize efficiency and reduce wasted time. We all know that a minute is too long for the configure step. Let's make it quick so that people won't lose focus.

Why CMake? The Superior Alternative

CMake offers several advantages over autotools, making it a more attractive option for IBAMR. Its modern design, superior performance, and ease of use are just a few of the reasons why we're making the switch. The CMake community is huge, and it has excellent support and is well-documented. CMake is well-known and adopted by many developers.

Faster Builds and a Better Developer Experience

CMake's performance is a major selling point. As mentioned earlier, the configure step is significantly faster than autotools, leading to quicker build cycles and a better overall developer experience. Moreover, CMake's intuitive syntax makes it easier to write and maintain build scripts. This streamlined process frees up valuable time for developers to focus on the core functionality of IBAMR rather than wrestling with build system complexities.

Simplified Build System Management

CMake simplifies build system management. It reduces the risk of errors and inconsistencies across different platforms and compilers. This cross-platform compatibility is essential for IBAMR, which needs to run on a variety of systems. CMake also provides better support for modern software development practices, such as modularity and dependency management, which will enable us to build more robust, maintainable, and scalable software.

The Path Forward: Removing Autotools

We recognize that this is a significant change, and we want to ensure a smooth transition for everyone. We've set a target for removing autotools after the next release, which is expected sometime in March. The timeline gives us enough time to prepare for the change and make sure everything is in order before the switch. Of course, this is all subject to change if unexpected issues arise, but we are committed to seeing this through.

Seeking a Maintainer

Before we can remove autotools, we need to ensure that someone is willing to take responsibility for maintaining the CMake build system. This includes addressing any bugs, providing documentation, and assisting users who need help with the new system. If no one steps up to take on these tasks, we will be forced to delay the removal of autotools. We strongly encourage any interested individuals to volunteer or come forward and offer to help. The more hands we have on deck, the smoother the transition will be for everyone.

Automatic Build System Checks

We also need to incorporate automatic checks to ensure that any new additions to the codebase are correctly implemented in both build systems. This will minimize the risk of inconsistencies and reduce the time spent on debugging build-related issues. By automating this process, we can ensure that our build systems are always in sync and provide a consistent experience for all users.

Conclusion: Embracing Change for a Better IBAMR

Removing the autotools build system is a strategic move that will benefit the IBAMR project and its community. By switching to CMake, we can streamline our build process, improve developer productivity, and ensure a better user experience. We understand that change can be challenging, but we are confident that this transition will ultimately lead to a more robust, efficient, and user-friendly IBAMR. We're excited about the future and the positive impact this change will have on the project.