![]() ![]() Next to these, Portage will check if the binary package is built using the same USE flags as expected on the client. In this example CPU_FLAGS_X86 can be set to avx f16c mmx mmxext pclmul popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3 in /etc/portage/nf because these flags are supported by both the client and the host User $ cpuid2cpuflags CPU_FLAGS_X86: avx f16c mmx mmxext pclmul popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3 When changing -march to a lower subset for using binary packages on a client, a full recompilation is required to make sure that all binaries are compatible with the client's processor, to save time packages that are not compiled with e.g. When -mtune is not set it defaults to whatever -march is set to. For example, to compile code which is compatible with ivybridge and up but is tuned to run best on skylake set CFLAGS to -march=ivybridge -mtune=skylake. In contrast to -march, the -mtune argument does not prevent code from being executed on other processors. Optionally, it is also possible to set -mtune= some-arch or -mtune=native to tell gcc to tune code to a specific arch. To find which -march's are subsets of others, check the gcc manual, if there is no suitable subset set e.g. However, -mno-rdrnd is included as the client does not support -mrdrnd. mabm and -mrtm are not included as these are not supported but the client. In this example CFLAGS could be set to -march=ivybridge -mno-rdrnd since -march=ivybridge is a full subset of -march=skylake. User $ resolve-march-native -march=ivybridge -mno-rdrnd -param=l1-cache-line-size=64 -param=l1-cache-size=32 -param=l2-cache-size=3072 To use new GPKG format, set the BINPKG_FORMAT value in /etc/portage/nf. ![]() Motivation for the new GPKG format can be found in GLEP 78: Gentoo binary package container format. If users need to create binary packages for the system using older versions of Portage, please keep using the current XPAK format. The new format was completely redesigned to solve issues with the old design and to include new features, therefore no backward compatibility is provided. Starting with portage version 3.0.31, a new binary package format (GPKG) support has been added. 6.3 Understanding the binary package format.6.2 Creating snapshots of the packages directory.4.6 Updating packages on the binary package host.4.4 Reinstalling modified binary packages.4.3 Pulling packages from a binary package host. ![]() 4.2 Verify binary package's OpenPGP signature.2.4 Excluding creation of some packages.2.3 Implementing buildpkg as a Portage feature.2.2 Using -buildpkg as an emerge option.Near the end, a few more advanced topics on dealing with binary packages will be covered. This guide will focus on the following topics: Binaries packages also avoid failures in build processes since they are pre-compiled. It is usually helpful to install binary packages on old systems because they do not require build time dependencies to be installed/updated. The task of updating very old systems can be greatly eased using binary packages. Having pre-compiled binaries around either on a binary package server or locally can be of great help in case of a broken toolchain. Often binary packages are the only way of recovering a broken system (i.e. A variant of this approach is to do the updates in a chroot on the same system and use the binaries created there on the real system. Once the staging server is in a good state the updates can then be applied to the critical systems. This can be done by a staging server that performs all updates first to itself. For mission-critical systems in production it is important to stay usable as much as possible. Maintaining several similar systems, possibly some of them with older hardware, can be much easier if only one system has to compile everything from source and the other systems use the binary packages. Having to compile everything from source can become time consuming. Save time when keeping similar systems updated.There are many reasons why some system administrators like using binary packages for software installations on Gentoo: This guide explains how to create them, install them, and how to setup a binary package server. Next to the usual support for source-based ebuilds, Portage also supports building and installing binary packages. There now exists nf, which the Portage man page says is intended to be used as a replacement for PORTAGE_BINHOST. This guide uses the PORTAGE_BINHOST variable to configure binhosts. ![]()
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