Language Selection

English French German Italian Portuguese Spanish

Programming: GCC, RcppEigen and Python

Filed under
Development
  • Introduce a new GCC option, --record-gcc-command-line
    I would like to propose the following patches which introduce a compile option --record-gcc-command-line. When passed to gcc, it saves the command line option into the produced object file. The option makes it trivial to trace back how a file was compiled and by which version of the gcc. It helps with debugging, reproducing bugs and repeating the build process.
    
    This option is similar to -frecord-gcc-switches. However, they have three fundamental differences: Firstly, -frecord-gcc-switches saves the internal state after the argv is processed and passed by the driver. As opposed to that, --record-gcc-command-line saves the command-line as received by the driver. Secondly, -frecord-gcc-switches saves the switches as separate entries into a mergeable string section. Therefore, the entries belonging to different object files get mixed up after being linked. The new --record-gcc-command-line, on the other hand, creates one entry per invocation. By doing so, it makes it clear which options were used together in a single gcc invocation. Lastly, --record-gcc-command-line also adds the version of the gcc into this single entry to make it clear which version of gcc was called with any given command line. This is useful in cases where .comment section reports multiple versions.
    
    While there are also similarities between the implementations of these two options, they are completely independent. These commands can be used separately or together without issues. I used the same section that -frecord-gcc-switches uses on purpose. I could not use the name -frecord-gcc-command-line for this option; because of a {f*} in the specs, which forwards all options starting with -f to cc1/cc1plus as is. This is not we want for this option. We would like to append it a filename as well to pass the argv of the driver to child processes.
    
    This functionality operates as the following: It saves gcc's argv into a temporary file, and passes --record-gcc-command-line <tempfilename> to cc1 or cc1plus. The functionality of the backend is implemented via a hook. This patch includes an example implementation of the hook for elf targets: elf_record_gcc_command_line function. This function reads the given file and writes gcc's version and the command line into a mergeable string section, .GCC.command.line.
    
    
  • GCC Developers Discuss New Option For Recording Compiler Flags / Details In Binaries

    GCC developers recently have been discussing a new proposal over an option for preserving the command-line flags/options used when building a binary as well as the associated compiler version.

    The proposal sent out last week was over a --record-gcc-command-line option to save the compiler options into the produced object file. The proposal is in the name of helping debugging, reproducing bugs, and repeating build process. There is already a -frecord-gcc-switches option that is somewhat similar in behavior but with key differences as explained in the proposal.

  • RcppEigen 0.3.3.7.0

    A new minor release 0.3.3.7.0 of RcppEigen arrived on CRAN today (and just went to Debian too) bringing support for Eigen 3.3.7 to R.

    This release comes almost a year after the previous minor release 0.3.3.5.0. Besides the upgrade to the new upstream version, it brings a few accumulated polishes to the some helper and setup functions, and switches to the very nice tinytest package for unit tests; see below for the full list. As before, we carry a few required changes to Eigen in a diff.

  • “Higher Performance Python” at PyDataCambridge 2019

    I’ve had the pleasure of speaking at the first PyDataCambridge conference (2019), this is the second PyData conference in the UK after PyDataLondon (which colleagues and I co-founded 6 years back). I’m super proud to see PyData spread to 6 regional meetups and now 2 UK conferences.

More in Tux Machines

digiKam 7.7.0 is released

After three months of active maintenance and another bug triage, the digiKam team is proud to present version 7.7.0 of its open source digital photo manager. See below the list of most important features coming with this release. Read more

Dilution and Misuse of the "Linux" Brand

Samsung, Red Hat to Work on Linux Drivers for Future Tech

The metaverse is expected to uproot system design as we know it, and Samsung is one of many hardware vendors re-imagining data center infrastructure in preparation for a parallel 3D world. Samsung is working on new memory technologies that provide faster bandwidth inside hardware for data to travel between CPUs, storage and other computing resources. The company also announced it was partnering with Red Hat to ensure these technologies have Linux compatibility. Read more

today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.