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I work at Red Hat on GCC, the GNU Compiler Collection. For the last five releases of GCC, I've been working on -fanalyzer, a static analysis pass that tries to identify various problems at compile-time, rather than at runtime. It performs "symbolic execution" of C source code—effectively simulating the behavior of the code along the various possible paths of execution through it. This article summ

I am a GCC compiler engineer, and for the past 15 years, I have primarily focused on the GCC register allocator and instruction scheduler. The major development of the GCC register allocator and instruction scheduler was completed quite some time ago, and these days, my main responsibility is maintaining these essential GCC components. About six years ago, I began dedicating half of my work time t

Many think of Podman to be a replacement for Docker (if they have heard of Podman at all). But this is not the case, as Podman is another option that offers better security and developer features. Podman is a cloud-native, daemonless tool that helps developers manage their Linux containers. Podman is all about security, but also minimizing the friction between your local development environment an

As a consulting architect at Red Hat, I've had the privilege of working on legions of customer projects. Every customer brings their own challenges but I've found some commonalities. One thing most customers want to know is how to coordinate writes to more than one system of record. Answering this question typically involves a long explanation of dual writes, distributed transactions, modern alter

Building a static analyzer into the C compiler offers several advantages over having a separate tool, because the analyzer can track what the compiler and assembler are doing intimately. As a Red Hat employee, I work on GCC, the GNU Compiler Collection. Our static analyzer is still experimental but is making big strides in interesting areas, including a taint mode and an understanding of assembly-

The Red Hat Developer program provides a number of member benefits, including a no-cost Red Hat Developer Subscription for Individuals. The subscription provides access to Red Hat’s product portfolio via the Red Hat software access for developers page. Red Hat Enterprise Linux (RHEL) is one of the products included. The Red Hat Developer Subscription for Individuals lasts for one year. When it exp

“We build our computers the way we build our cities—over time, without a plan, on top of ruins.” Ellen Ullman wrote this in 1998, but it applies just as much today to the way we build modern applications; that is, over time, with short-term plans, on top of legacy software. In this article, I will introduce a few patterns and tools that I believe work well for thoughtfully modernizing legacy appli

Try Red Hat products and technologies without setup or configuration fees for 30 days with this shared Openshift and Kubernetes cluster.

For the past two years I've worked on a project implementing a universal lightweight Just-in-Time (JIT) compiler known as MIR. The cornerstone of the project is a machine-independent medium-level intermediate representation (MIR). A big part of the project consists of code that compiles C source code into MIR. Because MIR can be interpreted and just-in-timed, I easily extended this C-to-MIR compil

General 1. What is the Red Hat Developer program's Red Hat Developer Subscription for Individuals? The Red Hat Developer Subscription for Individuals is a no-cost offering of the Red Hat Developer program and includes access to Red Hat Enterprise Linux among other Red Hat products. It is a program and an offering designed for individual developers, available through the Red Hat Developer program.

It has been quite a year for Arm Ltd., the firm that designs reduced instruction set computing (RISC) architectures for computer processors. The news that Arm-based computers will be important for the foreseeable future has even reached the mainstream media. At the end of 2019, Amazon Web Services announced Arm-based Graviton2 servers. In June 2020, Apple announced its plans to move Macintosh comp

Podman is an excellent alternative to Docker containers when you need increased security, unique identifier (UID) separation using namespaces, and integration with systemd. In this article, I use real-world examples to show you how to install Podman, use its basic commands, and transition from the Docker command-line interface (CLI) to Podman. You'll also see how to run an existing image with Podm

Kubectl, the Kubernetes command-line interface (CLI), has more capabilities than many developers realize. For example, did you know that kubectl can reach the Kubernetes API while running inside a cluster? You can also use kubectl to assume different user identities, to select a custom editor to run with the kubectl edit command, and more. In this article, I introduce several kubectl CLI features

As a developer, you have probably heard a lot about containers. A container is a unit of software that provides a packaging mechanism that abstracts the code and all of its dependencies to make application builds fast and reliable. An easy way to experiment with containers is with the Pod Manager tool (Podman), which is a daemonless, open source, Linux-native tool that provides a command-line inte

The GNU Compiler Collection (GCC) 10.1 was released in May 2020. Like every other GCC release, this version brought many additions, improvements, bug fixes, and new features. Fedora 32 already ships GCC 10 as the system compiler, but it's also possible to try GCC 10 on other platforms (see godbolt.org, for example). Red Hat Enterprise Linux (RHEL) users will get GCC 10 in the Red Hat Developer Too

The Java community has demonstrated time and time again its ability to evolve, improve, and adapt to meet the needs of its developers and users. Even after 25 years of language and framework choices, Java has consistently ranked in the top languages in use today due to its strong track record and capabilities in enterprise use cases. Red Hat has long been a strong leader in Java and open source so

Here are the must-know top 10 design patterns for beginners synthesized from the Kubernetes Patterns book. Getting familiar with these patterns will help you understand foundational Kubernetes concepts, which in turn will help you in discussions and when designing Kubernetes-based applications. There are many important concepts in Kubernetes, but these are the most important ones to start with (sh

I work at Red Hat on GCC, the GNU Compiler Collection. For the next major release of GCC, GCC 10, I've been implementing a new -fanalyzer option: A static analysis pass to identify various problems at compile-time, rather than at runtime. My thinking here is that it's best to catch problems as early as possible as the code is written, using the compiler the code is written in as part of the compil

For the past three years, I've been participating in adding just-in-time compilation (JIT) to CRuby. Now, CRuby has the method-based just-in-time compiler (MJIT), which improves performance for non-input/output-bound programs. The most popular approach to implementing a JIT is to use LLVM or GCC JIT interfaces, like ORC or LibGCCJIT. GCC and LLVM developers spend huge effort to implement the optim

Try Red Hat products and technologies without setup or configuration fees for 30 days with this shared Openshift and Kubernetes cluster.

Linux has supported many kinds of tunnels, but new users may be confused by their differences and unsure which one is best suited for a given use case. In this article, I will give a brief introduction for commonly used tunnel interfaces in the Linux kernel. There is no code analysis, only a brief introduction to the interfaces and their usage on Linux. Anyone with a network background might be in

Among the most heavily used string handling functions declared in the standard C <string.h> header are those that copy and concatenate strings. Both sets of functions copy characters from one object to another, and both return their first argument: a pointer to the beginning of the destination object. The choice of the return value is a source of inefficiency that is the subject of this article. T

Note: As of May 2022, Red Hat CodeReady Containers is now Red Hat OpenShift Local. Read about the changes here: Developer tools rebrand, say farewell to CodeReady name Red Hat CodeReady Containers brings a minimal, preconfigured Red Hat OpenShift 4.1 or newer cluster to your local laptop or desktop computer for development and testing purposes. CodeReady Containers supports native hypervisors for

As a frequent contributor to open source projects (both within and beyond Red Hat), I find one of the most common time-wasters is dealing with code reviews of my submitted code that are negative or obstructive and yet essentially subjective or argumentative in nature. I see this most often when submitting to projects where the maintainer doesn't like the change, for whatever reason. In the best ca