Beyond Linux From Scratch 11.3/introduction_important_building-notes

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This translation is being used as source strings within this component.

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159 5,368 36,057		All strings	Browse Translate Zen
159 5,368 36,057		Read-only strings	Browse Translate Zen

Overview

Project website	www.linuxfromscratch.org
Translation process	Translations can be made directly. Translation suggestions can be made. Any authenticated user can contribute. The translation uses bilingual files.
Source code repository	`git@git.linuxfromscratch.org:fr-lfs`
Repository branch	11.3
Last remote commit	Update translations for 11.3 `6bfb71d1dc` Julien Lepiller authored 11 months ago
Last commit in Weblate	Translated using Weblate (Portuguese (Brazil)) `84a1614077` jamenson authored 11 months ago
Weblate repository	`https://translate.linuxfromscratch.org/git/linux-from-scratch-11-3/index/`
File mask	`blfs/*/introduction/important/building-notes.po`
Translation file	Not available
Last change	March 11, 2023, 9:26 a.m.
Last author	None

2 weeks ago

String statistics

	Strings percent	Hosted strings	Words percent	Hosted words	Characters percent	Hosted characters
Total		159		5,368		36,057
Translated	100%	159	100%	5,368	100%	36,057
Needs editing	0%	0	0%	0	0%	0
Read-only	100%	159	100%	5,368	100%	36,057
Failing checks	0%	0	0%	0	0%	0
Strings with suggestions	0%	0	0%	0	0%	0
Untranslated strings	0%	0	0%	0	0%	0

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None Source string added Beyond Linux From Scratch 11.3 introduction_important_building-notes English	English 0 characters edited Whilst gcc has many hardening options, clang/LLVM's strengths lie elsewhere. Some options which gcc provides are said to be less effective in clang/LLVM. a year ago
None Source string added Beyond Linux From Scratch 11.3 introduction_important_building-notes English	English 0 characters edited The main distros use much more, such as RELRO (Relocation Read Only) and perhaps <option>-fstack-clash-protection</option>. You may also encounter the so-called <quote>userspace retpoline</quote> (<option>-mindirect-branch=thunk</option> etc.) which is the equivalent of the spectre mitigations applied to the linux kernel in late 2018. The kernel mitigations caused a lot of complaints about lost performance, if you have a production server you might wish to consider testing that, along with the other available options, to see if performance is still sufficient. a year ago
None Source string added Beyond Linux From Scratch 11.3 introduction_important_building-notes English	English 0 characters edited For hardening options which are reasonably cheap, there is some discussion in the 'tuning' link above (occasionally, one or more of these options might be inappropriate for a package). These options are <option>-D_FORTIFY_SOURCE=2</option> and (for C++) <option>-D_GLIBCXX_ASSERTIONS</option>. On modern machines these should only have a little impact on how fast things run, and often they will not be noticeable. a year ago
None Source string added Beyond Linux From Scratch 11.3 introduction_important_building-notes English	English 0 characters edited In the past, there was Hardened LFS where gcc (a much older version) was forced to use hardening (with options to turn some of it off on a per-package basis). The current LFS and BLFS books are carrying forward a part of its spirit by enabling PIE (<option>-fPIE -pie</option>) and SSP (<option>-fstack-protector-strong</option>) as the defaults for GCC and clang. What is being covered here is different - first you have to make sure that the package is indeed using your added flags and not over-riding them. a year ago
None Source string added Beyond Linux From Scratch 11.3 introduction_important_building-notes English	English 0 characters edited Even on desktop systems, there are still a lot of exploitable vulnerabilities. For many of these, the attack comes via javascript in a browser. Often, a series of vulnerabilities are used to gain access to data (or sometimes to pwn, i.e. own, the machine and install rootkits). Most commercial distros will apply various hardening measures. a year ago
None Source string added Beyond Linux From Scratch 11.3 introduction_important_building-notes English	English 0 characters edited Options for hardening the build a year ago
None Source string added Beyond Linux From Scratch 11.3 introduction_important_building-notes English	English 0 characters edited If building Perl or Python modules, or Qt packages which use qmake, in general the CFLAGS and CXXFLAGS used are those which were used by those 'parent' packages. a year ago
None Source string added Beyond Linux From Scratch 11.3 introduction_important_building-notes English	English 0 characters edited There are also various other options which some people claim are beneficial. At worst, you get to recompile and test, and then discover that in your usage the options do not provide a benefit. a year ago
None Source string added Beyond Linux From Scratch 11.3 introduction_important_building-notes English	English 0 characters edited Clearly, if you are optimizing your own program you can spend time to profile it and perhaps recode some of it if it is too slow. But for building a whole system that approach is impractical. In general, -O3 usually produces faster programs than -O2. Specifying -march=native is also beneficial, but means that you cannot move the binaries to an incompatible machine - this can also apply to newer machines, not just to older machines. For example programs compiled for 'amdfam10' run on old Phenoms, Kaveris, and Ryzens : but programs compiled for a Kaveri will not run on a Ryzen because certain op-codes are not present. Similarly, if you build for a Haswell not everything will run on a SandyBridge. a year ago
None Source string added Beyond Linux From Scratch 11.3 introduction_important_building-notes English	English 0 characters edited Some packages default to '-O2 -g', others to '-O3 -g', and if CFLAGS or CXXFLAGS are supplied they might be added to the package's defaults, replace the package's defaults, or even be ignored. There are details on some desktop packages which were mostly current in April 2019 at <ulink url="https://www.linuxfromscratch.org/~ken/tuning/"/> - in particular, README.txt, tuning-1-packages-and-notes.txt, and tuning-notes-2B.txt. The particular thing to remember is that if you want to try some of the more interesting flags you may need to force verbose builds to confirm what is being used. a year ago

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