![]() All features should be easy to understand. Easy to implement the language specification.Semantic structure should be consistent and minimize the number of concepts. Inefficient constructs should be easily identifiable. Code should be readable and programming decisions explicit. The language should aid the design and development of reliable programs. A general, flexible design that adapts to satisfy the needs of embedded computer applications.Ariane 5ES: Ada Inside (photo DLR_de CC-BY-SA 2.0)Ĭrucial in the Steelman requirements were: The result was the so-called ‘ Steelman requirements‘. To pick the new programming language, the DoD chartered the High Order Language Working Group (HOLWG), a group of military and academic experts, to draw up a list of requirements and pick candidate languages. Ada code controls rockets like the Ariane 4 and 5, many satellites, and countless other systems where small glitches can have major consequences.Īda might also be the right choice for your next embedded project. Today, software written in Ada forms the backbone of not only military hardware, but also commercial projects like avionics and air-traffic control systems. With the 1995 revision, the language also targeted general purpose systems and added support for object-oriented programming (OOP) while not losing sight of the core values of reliability, maintainability and efficiency. Instead, Ada was designed to be be a single language, capable of running on all of those embedded systems, that offered the same or better level of performance and reliability. Packagers must be careful to move to the versioned layout described above.The Ada programming language was born in the mid-1970s, when the US Department of Defense (DoD) and the UK’s Ministry Of Defence sought to replace the hundreds of specialized programming languages used for the embedded computer systems that increasingly made up essential parts of military projects. If upstream versions the shared library file at a future point, However, in such cases, if the shared library file is necessaryįor users to run programs linked against it, To consider providing a properly versioned library file. When a shared library file is only provided in an unversioned format, Is an actual file, all of the other files are symbolic links to it. ![]() Only the fully versioned shared library file (/usr/lib/libfoo.so.3.2.0) This means that it belongs in a -devel package. Is only used to actually link libfoo to code being compiled,Īnd is not necessary to be installed on a users system. The other, unversioned, shared library file (/usr/lib/libfoo.so) (/usr/lib/libfoo.so.3.2.0 and /usr/lib/libfoo.so.3)Īre necessary for users to run programs linked against libfoo, On the system is missing features it needs. (because the SONAME dependency is satisfied)īut will fail when run because the library installed If the user just attempts to install or update that one application The new version of the library with new ABI is built in FedoraĪnd an application using that ABI is built. This can lead to a case where the user has an old version Without backwards incompatibilities that would cause SONAMES to be changed. This can be a problem if a library has added features over the course of time However, present versions of rpmbuild only add deps on library SONAMES, To determine the required packages in many cases. Modern package management tools are capable of resolving such dependencies We generally rely on rpmbuild to automatically add dependencies Packages must not contain unnecessary explicit Requires on libraries. Security Updates to Resolve Known CVE IssuesĮxplicit Requires are Requires added manually by the packager in the spec file.Renaming/Replacing or Removing Existing Packages.Replacing a Symlink to a Directory or a Directory to Any Type File.All patches should have an upstream bug link or comment.The package you depend on to provide a directory may choose to own a different directory in a later version and your package will run unmodified with that later version.The directory is owned by a package which is not required for your package to function.The directory is also owned by a package implementing required functionality of your package.The directory is wholly contained in your package, or involves core functionality of your package.Build Packages with Separate User Accounts.Scriplets are only allowed to write in certain directories.Why the %makeinstall Macro Should Not Be Used.Using % vs $RPM_BUILD_ROOT and $RPM_OPT_FLAGS.Avoid Bundling of Fonts in Other Packages.Bundling and Duplication of System Libraries.Build-Time Dependencies (BuildRequires).Limited Usage of /opt, /etc/opt, and /var/opt.No Files or Directories Under /srv, /usr/local, or /home/$USER.
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