#16295: Enable cached builds with Hadrian
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Reporter: snowleopard | Owner: (none)
Type: bug | Status: new
Priority: normal | Milestone:
Component: Build System | Version: 8.6.3
(Hadrian) |
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: None/Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
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Comment (by Marge Bot ):
In [changeset:"1dad4fc27ea128a11ba0077f459494c2a1ca0d5c/ghc"
1dad4fc2/ghc]:
{{{
#!CommitTicketReference repository="ghc"
revision="1dad4fc27ea128a11ba0077f459494c2a1ca0d5c"
Hadrian: Fix untracked dependencies
This is a preparation for #16295:
https://ghc.haskell.org/trac/ghc/ticket/16295
This commit mostly focuses on getting rid of untracked dependencies,
which prevent Shake's new `--shared` feature from appropriately caching
build rules.
There are three different solutions to untracked dependencies:
* Track them! This is the obvious and the best approach, but in some
situations we cannot use it, for example, because a build rule creates
files whose names are not known statically and hence cannot be
specified as the rule's outputs.
* Use Shake's `produces` to record outputs dynamically, within the rule.
* Use Shake's `historyDisable` to disable caching for a particular build
rule. We currently use this approach only for `ghc-pkg` which mutates
the package database and the file `package.cache`.
These two tickets are fixed as the result:
Ticket #16271: https://ghc.haskell.org/trac/ghc/ticket/16271
Ticket #16272: https://ghc.haskell.org/trac/ghc/ticket/16272 (this one
is fixed only partially: we correctly record the dependency, but we
still copy files into the RTS build tree).
}}}
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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16295#comment:2
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The Glasgow Haskell Compiler
