2018-05-15 6:02 GMT+09:00 Laura Abbott <labbott@xxxxxxxxxx>: > On 05/06/2018 11:28 PM, Masahiro Yamada wrote: >> >> 2018-03-30 3:01 GMT+09:00 Laura Abbott <labbott@xxxxxxxxxx>: >>> >>> Hi, >>> >>> This is v2 of my proposal to allow unique build-ids in the kernel. from >>> last time: >>> >>> "" >>> In Fedora, the debug information is packaged separately (foo-debuginfo) >>> and >>> can be installed separately. There's been a long standing issue where >>> only one >>> version of a debuginfo info package can be installed at a time. Mark >>> Wielaard >>> made an effort for Fedora 27 to allow parallel installation of debuginfo >>> (see >>> https://fedoraproject.org/wiki/Changes/ParallelInstallableDebuginfo for >>> more details) >>> >>> Part of the requirement to allow this to work is that build ids are >>> unique between builds. The existing upstream rpm implementation ensures >>> this by re-calculating the build-id using the version and release as a >>> seed. This doesn't work 100% for the kernel because of the vDSO which is >>> its own binary and doesn't get updated. After poking holes in a few of my >>> ideas, there was a discussion with some people from the binutils team >>> about >>> adding --build-id-salt to let ld do the calculation debugedit is doing. >>> There >>> was a counter proposal made about adding some extra information via a >>> .comment >>> which will affect the build id calculation but just get stripped out. >>> "" >> >> >> >> I think you already know '--build-id=uuid' linker option. >> >> Doesn't this solve your problem? >> >> The disadvantage of this option is, >> we will lose reproducible building because --build-id=uuid >> adds every time random salt. >> >> The advantage is, the implementation is even simpler, >> and easier to migrate to --build-id-salt once it is supported >> in the future. >> >> > > It could, theoretically. The reproducibility is nice though and > I'd like to keep the kernel close to matching what other packages > do though. Okay. I left some comments in v2 about improvement, and cause of the sporadic build failures. Will wait for v3. -- Best Regards Masahiro Yamada -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
