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They take the general form `foo.bar.baz [+]= some values`, where
`=` completely overrides the arguments for a builder and `+=` extends
them. We currenly only support settings for updating the GHC and C
compiler options, of the form:
```
{stage0, ..., stage3 or *}.{package name or *}
.ghc.{c, hs, link, deps, toolargs or *}.opts
{stage0, ..., stage3 or *}.{package name or *}
.cc.{c, deps or *}.opts
```
The supported settings and their use is covered in the new section
of `hadrian/doc/user-settings.md`, while the implementation is explained
in a new Note [Hadrian settings].
Most of the logic is implemented in a new module, `Settings.Parser`, which
contains key-value assignment/extension parsers as well as utilities for
specifying allowed settings at a high-level, generating a `Predicate` from
such a description or generating the list of possible completions for a given
string.
The additions to the `Settings` module make use of this to describe the
settings that Hadrian currently supports, and apply all such
key-value settings (from the command line and `<root>/hadrian.settings`)
to the flavour that Hadrian is going to proceed with.
This new setting system comes with support for generating Bash completions,
implemented in `hadrian/completion.sh` and Hadrian's `autocomplete` target:
> source hadrian/completion.sh
> hadrian/build.sh stage1.base.ghc.<TAB>
stage1.base.ghc.c.opts stage1.base.ghc.hs.opts
stage1.base.ghc.*.opts stage1.base.ghc.deps.opts
stage1.base.ghc.link.opts stage1.base.ghc.toolargs.opts
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In Hadrian, building programs (e.g. `ghc` or `haddock`) requires libraries located in the ghc-pkg package database i.e.
_build/stage1/lib/x86_64-linux-ghc-8.9.0.20190430/libHSdeepseq-1.4.4.0-ghc8.9.0.20190430.so
Add the corresponding `need`s for these library files and the subsequent rules.
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Previously, as reported in #15938, resuming a build "in the middle",
e.g when building _build/stage1/libraries/base/, hadrian would take up
to a whole minute to get started doing actual work, building code.
This was mostly due to a big enumeration that we do in Rules.hs, to
generate all the possible patterns for object files for 1) all ways, 2)
all packages and 3) all stages. Since rule enumeration is always
performed, whatever the target, we were always paying this cost, which
seemed to grow bigger the farther in the build we stopped and were
resuming from.
Instead, this patch borrows the approach that we took for Rules.Library
in https://github.com/snowleopard/hadrian/pull/571, which exposes all the
relevant object files under as few catch-all rules as possible (8 here),
and parses all the information we need out of the object's path.
The concrete effect of this patch that I have observed is to reduce the
45-60 seconds pause to <5 seconds. Along with the Shake performance
improvements that Neil mentions in #15938, most of the pause should
effectively disappear.
Reviewers: snowleopard, bgamari, goldfire
Reviewed By: snowleopard
Subscribers: rwbarton, carter
GHC Trac Issues: #15938
Differential Revision: https://phabricator.haskell.org/D5412
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* Link to Quick Start guide
* Update README.md (hadrian/578)
* Fix AppVeyor (hadrian/577)
* Fix CircleCI
* Generic library rules (hadrian/571)
* Fix lint error (hadrian/575)
* Fix missing libHSghc-8.5-0.a (hadrian/574)
* Fix the path to touchy (hadrian/572)
* Fix integer-gmp build (hadrian/568)
* Undo fs*.h workaround
* Fix copying of fs*.h files during RTS registration (hadrian/566)
* Fix Windows build, improve error reporting (hadrian/565)
* Fix Windows build (hadrian/563)
* Fix boot and configure on AppVeyor (hadrian/561)
* Preliminary bindist (hadrian/558, hadrian/555)
* Unregister stage0 package first if it needs to be
cloned (hadrian/552)
* Fix Circle CI (hadrian/553)
* Fix warnings (hadrian/547)
* Merge pull request hadrian/542 from Mistuke/fix-specific-file
* Use Cabal directly in place of ghc-cabal + make build root
configurable (hadrian/531)
* Add user-defined flavour example for turning off dynamic
linking (hadrian/535)
* Add clean routines for fs (hadrian/533)
* Add 'git' to nativeBuildInputs in shell.nix (hadrian/530)
* Add extra include paths when invoking ghc-cabal (hadrian/526)
* Merge pull request hadrian/528 from snowleopard/bump-cabal
* Merge pull request hadrian/521 from snowleopard/drop-chmod
* Change permission bits for build.cabal.sh,
fixes hadrian/517 (hadrian/520)
* Pin nixpkgs and all-cabal-hashes in shell.nix (hadrian/511)
* Add troubleshooting section
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* Make shell.nix less broken (hadrian/510)
* Add --configure flag to the script
* Undo iserv changes (hadrian/507)
* Fix ghc-cabal: Parsec modules are now found in libraries/parsec/src (hadrian/506)
* Move a bunch of types into dedicated modules (hadrian/502)
* Add --quickjump to Haddock (hadrian/505)
* Add iserv library (hadrian/504)
* Merge pull request hadrian/503 from snowleopard/angerman-patch-1
* Merge pull request hadrian/500 from snowleopard/runtime-deps
* Fix Hadrian after Cabal changes (hadrian/498)
* Drop custom logic for Scav_thr and Evac_thr (hadrian/497)
* Fix Haddock (hadrian/496)
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It will remain a submodule until we are ready to merge Hadrian into the
tree.
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