my build time impact of clang 5.0

[Mike Tancsa]

On 10/2/2017 2:34 PM, Dan Mack wrote:
> 
> Another significant change in build times this week - not complaining,
> just my observations on build times; same server doing buildworld during
> the various phases of compiler changes over the last year or so FWIW:

Kernel seems to be about the same since 4.x  Perhaps the added
buildworld time is due to a larger feature set of clang 5.x  and hence
takes longer to build itself ?  e.g. more platforms supported etc ?


> 
> |--------------+--------------+---------------+----------+-----------|
> | Ver (svn-id) | World (mins) | Kernel (mins) | Relative | Comment   |
> |--------------+--------------+---------------+----------+-----------|
> |       292733 |           90 |            16 |      0.5 |           |
> |       299948 |           89 |            16 |      0.5 |           |
> |       322724 |          174 |            21 |      1.0 | clang 4.x |
> |       323310 |          175 |            21 |      1.0 | clang 4.x |
> |       323984 |          175 |            21 |      1.0 | clang 4.x |
> |       324130 |          285 |            21 |      1.6 | clang 5.x |
> |       324204 |          280 |            21 |      1.6 | clang 5.x |
> |--------------+--------------+---------------+----------+-----------|
> 
> Dan
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