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Differential D13827

Enable ld.lld as bootstrap linker by default on amd64
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Authored by emaste on Jan 10 2018, 5:52 PM.
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bdrewery
imp
kbowling
lattera-gmail.com

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dim
brooks
bapt
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manpages
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rS327784: regen src.conf.5 after r327783, WITH_LLD_BOOTSTRAP default
Summary

For some time we have been planning to migrate to LLVM's lld linker. Having a man page was the last blocking issue for using ld.lld to link the base system kernel + userland, now addressed by rS327770. Link the kernel and userland libraries and binaries with ld.lld by default, for additional test coverage.

To revert to using ld.bfd as the bootstrap linker, in /etc/src.conf set WITHOUT_LLD_BOOTSTRAP=yes. (And follow up with a PR or post to the freebsd-toolchain mailing list explaining any reason WITH_LLD_BOOTSTRAP by default fails for your use case.)




Note that GNU ld.bfd is still installed as /usr/bin/ld, and will still be used for linking ports.  A followup commit will set WITH_LLD_IS_LD by default.



Release notes:  Yes
Sponsored by:   The FreeBSD Foundation
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rS FreeBSD src repository - subversion 
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Tests Not Applicable
 
Event Timeline
emaste created this revision.Jan 10 2018, 5:52 PM
Herald added a subscriber: bdrewery.  ·  View Herald TranscriptJan 10 2018, 5:52 PM
brooks accepted this revision.Jan 10 2018, 5:55 PM
LGTM
This revision is now accepted and ready to land.Jan 10 2018, 5:55 PM
emaste added a subscriber: imp.Jan 10 2018, 5:55 PM
emaste added inline comments.
share/man/man5/src.conf.5


999–1003 ↗(On Diff #37734)
Seems someone (@imp?) added or changed options and did not regen src.conf.5?
lattera-gmail.com added a subscriber: lattera-gmail.com.Jan 10 2018, 5:59 PM
imp added inline comments.Jan 10 2018, 6:09 PM
share/man/man5/src.conf.5


999–1003 ↗(On Diff #37734)
likely.
emaste added a comment.Jan 10 2018, 6:15 PM
See also D13813 for a few open comments on the man page
kbowling added a subscriber: kbowling.Jan 10 2018, 6:19 PM
bapt accepted this revision.Jan 10 2018, 7:06 PM
dim accepted this revision.Jan 10 2018, 7:12 PM
LGTM
emaste added a comment.Jan 10 2018, 8:30 PM
Committed in rS327783
Closed by commit rS327784: regen src.conf.5 after r327783, WITH_LLD_BOOTSTRAP default (authored by emaste).  ·  Explain WhyJan 10 2018, 8:36 PM
This revision was automatically updated to reflect the committed changes.
Herald added a reviewer: manpages.  ·  View Herald TranscriptJan 10 2018, 8:36 PM
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head/
share/
man/
man5/
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Diff 37747
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head/share/man/man5/src.conf.5
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