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. "" This v2 cleans up the naming to be consistent and also switches to a config option vs. an environment variable. I've seen some sporadic failures about missing the generated header so I think I'm still missing a dependency somewhere. I'm still mostly looking for feedback whether this would be acceptable for merging or if we should just persue a --build-id-salt in binutils. Thanks, Laura Laura Abbott (3): kbuild: Introduce build-salt generated header kbuild: Link with generated build-salt header x86/vdso: Add build salt to the vDSO Makefile | 13 +++++++++++-- arch/x86/entry/vdso/vdso-layout.lds.S | 3 +++ init/Kconfig | 8 ++++++++ scripts/.gitignore | 1 + scripts/Makefile | 2 +- scripts/build-salt.lds.S | 5 +++++ scripts/gensalt | 21 +++++++++++++++++++++ scripts/link-vmlinux.sh | 3 ++- 8 files changed, 52 insertions(+), 4 deletions(-) create mode 100644 scripts/build-salt.lds.S create mode 100755 scripts/gensalt -- 2.16.2 -- 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
