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On 02/01/15 15:00, Zac Medico wrote: |
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> On 01/31/2015 08:04 AM, Anthony G. Basile wrote: |
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>> Yeah I just confirmed that. I installed amd64 fbsd 10.1. I've used |
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>> obsd for years and noticed the "UNIX - System V" and just thought it was |
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>> the same for all *bsd systems. This is the only time I've seen a |
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>> different OS/ABI. |
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> |
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> Hmm, that's interesting. I just noticed that on wikipedia they have a |
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> table listing 9 different constants [1]. |
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Oh I know there are different values possible here! But are they used |
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in practice? Note that wikipedia also says "It is often set to 0 |
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regardless of the target platform." |
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> |
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>> Anyhow, I did some perf testing. Concentrating on www-apps/moodle (which |
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>> is a huge package of some 19000 files but no elfs), and |
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>> app-emulation/wine (which has 11000 elf objects) and I found no |
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>> appreciable performance hit. |
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> |
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> Good. If you have enough memory, the ELF headers are likely to be in the |
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> buffer cache when portage probes them for the multilib category. So, if |
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> you're lucky, it will just read from the buffer cache instead of from |
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> the disk. |
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> |
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>> Other tests show that PROVIDES, REQUIRES and NEEDED.ELF.2 are correctly |
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>> being generated. |
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> |
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> Great, thanks for validating this. |
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> |
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>> Once committed, I'll rebuild @system and see if we get the correct |
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>> linkage graph. I have scripts do build such a graph from readelf -d and |
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>> so I can compare. |
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> |
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> Excellent. Also, I've been making lots of progress on soname dependency |
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> resolution in portage [2]. Pretty soon, it should be ready to merge into |
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> the integration branch [3], for wider testing via the corresponding |
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> overlay [4]. |
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> |
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> [1] http://en.wikipedia.org/wiki/Executable_and_Linkable_Format#File_header |
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> [2] https://github.com/zmedico/portage/tree/binpkg-soname-deps |
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> [3] https://github.com/zmedico/portage/tree/binpkg-support-integration |
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> [4] https://github.com/zmedico/portage-binpkg-support-overlay |
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> |
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Nice! |
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-- |
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Anthony G. Basile, Ph. D. |
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Chair of Information Technology |
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D'Youville College |
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Buffalo, NY 14201 |
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(716) 829-8197 |
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