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On Tue, Jul 24, 2018 at 4:08 PM, James Le Cuirot <chewi@g.o> wrote: |
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> Please read my background [arm17] email before reviewing this. This is |
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> my first news item so please be kind! I have deliberately chosen |
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> News-Item-Format 1.0 to include older systems and because I do not need |
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> any 2.0 features. |
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> |
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> |
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> Title: ARM 17.0 profile migration with CHOST change |
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> Author: James Le Cuirot <chewi@g.o> |
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> Content-Type: text/plain |
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> Posted: 2018-07-24 |
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> Revision: 1 |
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> News-Item-Format: 1.0 |
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> Display-If-Keyword: arm |
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> |
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> The new 17.0 profiles for ARM are now officially available. This not |
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> only features the PIE migration previously announced for other |
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> architectures but also a triplet (CHOST) change for hardfloat systems. |
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> |
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> In short, the triplet will change from armv7a-hardfloat-linux-gnueabi |
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> to armv7a-unknown-linux-gnueabihf or similar. This is to fall in line |
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> with what the rest of the Linux community are now using. If the vendor |
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> (2nd) part of your triplet is different or missing then you may keep |
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> it as it is. The hf ending is what matters. |
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> |
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> If you are using an unversioned alternative profile such as |
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> hardened/linux/arm/armv7a then the default CHOST will have changed for |
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> you already. Hopefully, you were shielded from the change by having |
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> CHOST explicitly set in your make.conf. In this case, a migration is |
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> still required. |
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> |
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> Changing CHOST is never simple and does carry some risk. We encourage |
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> users to migrate but if you do not have sys-devel/llvm on your system |
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> and you do not cross-compile for ARM then you may choose to keep your |
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> existing CHOST. We will continue to support this to some degree |
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> although we cannot promise that other packages will not be affected in |
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> future. |
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> |
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> If you choose not to migrate or your system is not hardfloat then you |
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> must ensure that CHOST is explicitly set in make.conf and then proceed |
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> with a regular 17.0 migration to deal with PIE as detailed here: |
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> |
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> https://www.gentoo.org/support/news-items/2017-11-30-new-17-profiles.html |
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> |
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> Otherwise, if you do wish to migrate then we have written a script to |
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> do the necessary steps for you: |
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> |
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> https://gist.github.com/chewi/1601684ad8f3cf8de0b786c00fa09b3c |
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> |
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> |
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Could we check this in someplace? (gentoo/scripts?) |
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|
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> It takes a minimal backup of the existing toolchain with quickpkg |
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> before changing anything but we strongly recommend that you take a |
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> full backup first. The script echos each command as it goes along so |
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> that you can keep an eye on what it's doing. You are, of course, |
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> welcome to tinker with the script or perform the migration manually if |
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> you think you know your own system better. It is heavily commented for |
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> this reason. |
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> |
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> If the script fails then you can take remedial action before running |
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> it again and it should skip any time-consuming builds that it has |
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> already done. If the migration doesn't go to plan then please do seek |
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> help in #gentoo-arm. |
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> |
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> A migration of this kind can justify rebuilding @world but with ARM |
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> typically being very slow, the script does just the minimum |
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> necessary. You are free to rebuild @world yourself after running it. |
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> |
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> -- |
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> James Le Cuirot (chewi) |
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> Gentoo Linux Developer |
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> |
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