[gentoo-user] Re: linux-headers-4.19 & glibc
On 24/07/2019 16:49, Hasan ÇALIŞIR wrote: Today i got linux-headers-4.19 update. Doesn't it need re-building glibc that currently not triggered on my system? Nope. No need.
Re: [gentoo-user] Re: linux-headers-3.5 with 3.4 kernel?
I totally agree with Q 2012.07.23. 23:15, »Q« boxc...@gmx.net ezt írta: On Mon, 23 Jul 2012 17:16:41 +0300 Nikos Chantziaras rea...@gmail.com wrote: Portage now installs sys-kernel/linux-headers-3.5. sys-kernel/gentoo-sources is at 3.4.5. Is it even adviced to do that, installing 3.5 headers and running a 3.4 kernel? This sounds like a bad idea to me. As I read the glibc faq, linux-headers are backwards-compatible as far as glibc is concerned; that is, newer linux-headers still have everything needed to make glibc work with older kernels. And I assume that holds for other packages which need linux-headers, not just glibc. Whether my understanding of why is correct or not, the glibc folks do recommend using the latest linux-headers, even if your kernel is older. https://www.gnu.org/software/libc/documentation.html links to http://sourceware.org/glibc/wiki/FAQ#What_version_of_the_Linux_kernel_headers_should_be_used.3F .
[gentoo-user] Re: linux-headers-3.5 with 3.4 kernel?
On 23/07/12 23:01, Helmut Jarausch wrote: On 07/23/2012 04:16:41 PM, Nikos Chantziaras wrote: Portage now installs sys-kernel/linux-headers-3.5. sys-kernel/gentoo-sources is at 3.4.5. Is it even adviced to do that, installing 3.5 headers and running a 3.4 kernel? This sounds like a bad idea to me. Why are you not using the 3.5.0 kernel Because BFS doesn't support it yet.
[gentoo-user] Re: linux-headers-3.5 with 3.4 kernel?
On Mon, 23 Jul 2012 17:16:41 +0300 Nikos Chantziaras rea...@gmail.com wrote: Portage now installs sys-kernel/linux-headers-3.5. sys-kernel/gentoo-sources is at 3.4.5. Is it even adviced to do that, installing 3.5 headers and running a 3.4 kernel? This sounds like a bad idea to me. As I read the glibc faq, linux-headers are backwards-compatible as far as glibc is concerned; that is, newer linux-headers still have everything needed to make glibc work with older kernels. And I assume that holds for other packages which need linux-headers, not just glibc. Whether my understanding of why is correct or not, the glibc folks do recommend using the latest linux-headers, even if your kernel is older. https://www.gnu.org/software/libc/documentation.html links to http://sourceware.org/glibc/wiki/FAQ#What_version_of_the_Linux_kernel_headers_should_be_used.3F.
Re: [gentoo-user] Re: linux-headers-2.6.38
On Thu, Aug 11, 2011 at 07:50, Nikos Chantziaras rea...@arcor.de wrote: On 08/10/2011 04:02 PM, c...@chrekh.se wrote: There is at least a theoretical benifit if you set NPTL_KERN_VER=2.6.38 in make.conf and recompile glibc. That way glibc could use things not present in older kernels. glibc will use things in newer kernels anyway. You don't need to use NPTL_KERN_VER=2.6.38 in order for glibc to use 2.6.38 features; it will do that by default. NPTL_KERN_VER only omits fallbacks for older kernels. It's there to reduce the size of glibc. The size difference is very small though. Thanks for the explanation, Nikos. Since the size difference is very small, I'll just use NPTL_KER_VER as it is (that is, not mucking with it). Rgds, -- FdS Pandu E Poluan ~ IT Optimizer ~ • Blog : http://pepoluan.tumblr.com • Linked-In : http://id.linkedin.com/in/pepoluan
[gentoo-user] Re: linux-headers-2.6.38
Nikos Chantziaras rea...@arcor.de writes: glibc will use things in newer kernels anyway. You don't need to use NPTL_KERN_VER=2.6.38 in order for glibc to use 2.6.38 features; it will do that by default. NPTL_KERN_VER only omits fallbacks for older kernels. It's there to reduce the size of glibc. The size difference is very small though. That seems likely. Thanks. Do you know if linux-headers-2.6.38 is needed for that to work? I would guess it is. -- Christer
[gentoo-user] Re: linux-headers-2.6.38
Pandu Poluan pa...@poluan.info writes: While I'm about to do an `emerge -e @world` ... Should I `emerge -av =sys-kernel/linux-headers-2.6.38 ` ? Any benefits over the current sys-kernel/linux-headers-2.6.36.1 ? There is at least a theoretical benifit if you set NPTL_KERN_VER=2.6.38 in make.conf and recompile glibc. That way glibc could use things not present in older kernels. I haven't researched if there are any such things, perhaps someone else knows. Also, beware. If you recompile glibc withe NPTL_KERN_VER set, you can't boot with older kernels anymore. -- Christer
Re: [gentoo-user] Re: linux-headers-2.6.38
On Wed, Aug 10, 2011 at 20:02, c...@chrekh.se wrote: Pandu Poluan pa...@poluan.info writes: While I'm about to do an `emerge -e @world` ... Should I `emerge -av =sys-kernel/linux-headers-2.6.38 ` ? Any benefits over the current sys-kernel/linux-headers-2.6.36.1 ? There is at least a theoretical benifit if you set NPTL_KERN_VER=2.6.38 in make.conf and recompile glibc. That way glibc could use things not present in older kernels. I haven't researched if there are any such things, perhaps someone else knows. Hmmm... without a reference, I'd rather not do something too drastic... Also, beware. If you recompile glibc withe NPTL_KERN_VER set, you can't boot with older kernels anymore. Can you explain what did you mean with older kernels? Kernels older than a certain version, or a previously-compiled kernel on my system? Anyways, this is a fresh install, so I don't think I'll have any trouble. But will still appreciate a reference and/or explanation re: NPTL_KERN_VER, though. Rgds -- FdS Pandu E Poluan ~ IT Optimizer ~ • Blog : http://pepoluan.tumblr.com • Linked-In : http://id.linkedin.com/in/pepoluan
[gentoo-user] Re: linux-headers-2.6.38
Pandu Poluan pa...@poluan.info writes: On Wed, Aug 10, 2011 at 20:02, c...@chrekh.se wrote: Also, beware. If you recompile glibc withe NPTL_KERN_VER set, you can't boot with older kernels anymore. Can you explain what did you mean with older kernels? Kernels older than a certain version, or a previously-compiled kernel on my system? Older then the kernel you specified, previously-compiled kernels not older than that is still fine. Any executable linked to glibc will fail unconditionally with FATAL: Kernel too old, including init. Anyways, this is a fresh install, so I don't think I'll have any trouble. But will still appreciate a reference and/or explanation re: NPTL_KERN_VER, though. glibc will be configured with --enable-kernel=2.6.38 The configure help says this; --enable-kernel=VERSION compile for compatibility with kernel not older than VERSION -- Christer
[gentoo-user] Re: linux-headers-2.6.38
On 08/10/2011 04:02 PM, c...@chrekh.se wrote: Pandu Poluanpa...@poluan.info writes: While I'm about to do an `emerge -e @world` ... Should I `emerge -av =sys-kernel/linux-headers-2.6.38 ` ? Any benefits over the current sys-kernel/linux-headers-2.6.36.1 ? There is at least a theoretical benifit if you set NPTL_KERN_VER=2.6.38 in make.conf and recompile glibc. That way glibc could use things not present in older kernels. I haven't researched if there are any such things, perhaps someone else knows. glibc will use things in newer kernels anyway. You don't need to use NPTL_KERN_VER=2.6.38 in order for glibc to use 2.6.38 features; it will do that by default. NPTL_KERN_VER only omits fallbacks for older kernels. It's there to reduce the size of glibc. The size difference is very small though.
Re: [gentoo-user] Re: linux-headers
On 14/01/09 Nikos Chantziaras said: You don't need to have them in sync. The safest is to have a version that is either equal or lower to your kernel. So for you, 2.6.23-r3 is perfectly fine. An exception is if you're using a recent glibc (2.9); you'll need to build it against more recent headers. Hmm. Well, I'm currently using sys-libs/glibc-2.6.1, but presumably that will change at some point in the future... Mike -- Michael P. Soulier msoul...@digitaltorque.ca Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction. --Albert Einstein pgpbEzybTPUf9.pgp Description: PGP signature
[gentoo-user] Re: linux-headers
Michael P. Soulier wrote: Hello, I'm currently running kernel 2.6.25 and I have no issues with it so I don't really want to upgrade it just yet. I just picked up sys-kernel/linux-headers-2.6.27-r2, so I thought I'd mask out anything above 2.6.25 for now to keep the headers in sync with the kernel that I'm running. You don't need to have them in sync. The safest is to have a version that is either equal or lower to your kernel. So for you, 2.6.23-r3 is perfectly fine. An exception is if you're using a recent glibc (2.9); you'll need to build it against more recent headers.
[gentoo-user] Re: linux-headers vs gentoo-sources
This show the disadvantage of aggressively cleaning $DISTDIR. You have already downloaded this file once, when you installed 2.6.17-r1 (or even earlier when you first installed a 2.6.17 kernel). Patch level updates use the same source files, so cleaning out tarballs for installed packages results in more downloads and more load on the mirrors. Thanks for pointing this out. Suppose it's listed somewhere, but new to me. Newbie p.s. perhaps a permanent link on the newsletter to a page titled 20 (30?) useful tidbits that everyone knows about Gentoo, that make life easier? It would include a link to Bugzilla; references to equery depends; dep -L; pquery --vdb --revdep; only one emerge sync per day; etc. i.e. all the stuff that recurrs here. -- gentoo-user@gentoo.org mailing list
