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* Add option `no-keep-hi-files` and `no-keep-o-files` (fixes #4114)Kai Harries2016-03-241-0/+12
| | | | | | | | | | | | | | | | | Summary: Remove `.hi` and `.o` files if the flags `no-keep-hi-files` and `no-keep-o-files` are given. Test Plan: ./validate Reviewers: austin, thomie, bgamari Reviewed By: thomie, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2021 GHC Trac Issues: #4114
* users-guide: Add -Wredundant-constraints to flags referenceBen Gamari2016-03-241-0/+7
| | | | | | | | | | | | Test Plan: Validate and read Reviewers: austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2035 GHC Trac Issues: #11741
* Default RuntimeRep variables unless -fprint-explicit-runtime-repsBen Gamari2016-03-241-0/+7
| | | | | | | | | | | | | | | | | | | | Summary: Addresses #11549 by defaulting `RuntimeRep` variables to `PtrRepLifted` and adding a new compiler flag `-fprint-explicit-runtime-reps` to disable this behavior. This is just a guess at the right way to go about this. If it's wrong-beyond-any-hope just say so. Test Plan: Working on a testcase Reviewers: goldfire, austin Subscribers: simonpj, thomie Differential Revision: https://phabricator.haskell.org/D1961 GHC Trac Issues: #11549
* Add -foptimal-applicative-doSimon Marlow2016-03-111-0/+6
| | | | | | | | | | | | | | | | | | | | Summary: The algorithm for ApplicativeDo rearrangement is based on a heuristic that runs in O(n^2). This patch adds the optimal algorithm, which is O(n^3), selected by a flag (-foptimal-applicative-do). It finds better solutions in a small number of cases (about 2% of the cases where ApplicativeDo makes a difference), but it can be very slow for large do expressions. I'm mainly adding it for experimental reasons. ToDo: user guide docs Test Plan: validate Reviewers: simonpj, bgamari, austin, niteria, erikd Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1969
* Print which warning-flag controls an emitted warningMichael Walker2016-02-251-0/+5
| | | | | | | | | | | | | | | | | Both gcc and clang tell which warning flag a reported warning can be controlled with, this patch makes ghc do the same. More generally, this allows for annotated compiler output, where an optional annotation is displayed in brackets after the severity. This also adds a new flag `-f(no-)show-warning-groups` to control whether to show which warning-group (such as `-Wall` or `-Wcompat`) a warning belongs to. This flag is on by default. This implements #10752 Reviewed By: quchen, bgamari, hvr Differential Revision: https://phabricator.haskell.org/D1943
* Make warning names more consistentManav Rathi2016-02-252-1/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | - Replace "Sigs" with "Signatures" in WarningFlag data constructors. - Replace "PatSyn" with "PatternSynonym" in WarningFlag data constructors. - Deprecate "missing-local-sigs" in favor of "missing-local-signatures". - Deprecate "missing-exported-sigs" in favor of "missing-exported-signatures". - Deprecate "missing-pat-syn-signatures" in favor of "missing-pattern-synonym-signatures". - Replace "ddump-strsigs" with "ddump-str-signatures" These complete the tasks that were explicitly mentioned in #11583 Test Plan: Executed `ghc --show-options` and verified that the flags were changed as expected. Reviewers: svenpanne, austin, bgamari Reviewed By: austin, bgamari Subscribers: mpickering, thomie Differential Revision: https://phabricator.haskell.org/D1939 GHC Trac Issues: #11583
* Docs: -keep-llvm-file(s)/-ddump-llvm imply -fllvmThomas Miedema2016-02-222-5/+7
| | | | This fixes #9917.
* Docs: no space in `-i⟨dir1⟩:⟨dir2⟩` [skip ci]Thomas Miedema2016-02-191-1/+1
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* Remove documentation for -Wlazy-unlifted-bindingsBen Gamari2016-02-161-7/+0
| | | | | | | | | | | | | | | | | This flag was supposed to be removed in 7.10. This finally resolves Trac #8022. Test Plan: Read it Reviewers: austin Reviewed By: austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1922 GHC Trac Issues: #8022
* Document -dynamic-too (#11488)Simon Marlow2016-02-153-19/+22
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* Overhaul the Overhauled Pattern Match CheckerGeorge Karachalias2016-02-041-13/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Overhaul the Overhauled Pattern Match Checker * Changed the representation of Value Set Abstractions. Instead of using a prefix tree, we now use a list of Value Vector Abstractions. The set of constraints Delta for every Value Vector Abstraction is the oracle state so that we solve everything only once. * Instead of doing everything lazily, we prune at once (and in general everything is much stricter). Hence, an example written with pattern guards is checked in almost the same time as the equivalent with pattern matching. * Do not store the covered and the divergent sets at all. Since what we only need is a yes/no (does this clause cover anything? Does it force any thunk?) We just keep a boolean for each. * Removed flags `-Wtoo-many-guards` and `-ffull-guard-reasoning`. Replaced with `fmax-pmcheck-iterations=n`. Still debatable what should the default `n` be. * When a guard is for sure not going to contribute anything, we treat it as such: The oracle is not called and cases `CGuard`, `UGuard` and `DGuard` from the paper are not happening at all (the generation of a fresh variable, the unfolding of the pattern list etc.). his combined with the above seems to be enough to drop the memory increase for test T783 down to 18.7%. * Do not export function `dsPmWarn` (it is now called directly from within `checkSingle` and `checkMatches`). * Make `PmExprVar` hold a `Name` instead of an `Id`. The term oracle does not handle type information so using `Id` was a waste of time/space. * Added testcases T11195, T11303b (data families) and T11374 The patch addresses at least the following: Trac #11195, #11276, #11303, #11374, #11162 Test Plan: validate Reviewers: goldfire, bgamari, hvr, austin Subscribers: simonpj, thomie Differential Revision: https://phabricator.haskell.org/D1795
* Split off -Wunused-type-variables from -Wunused-matchesRyanGlScott2016-01-261-0/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Summary: Previously, `-Wunused-matches` would fire whenever it detected unused type variables in a type family or data family instance. This can be annoying for users who wish to use type variable names as documentation, as being `-Wall`-compliant would mean that they'd have to prefix many of their type variable names with underscores, making the documentation harder to read. To avoid this, a new warning `-Wunused-type-variables` was created that only encompasses unused variables in family instances. `-Wunused-matches` reverts back to its role of only warning on unused term-level pattern names. Unlike `-Wunused-matches`, `-Wunused-type-variables` is not implied by `-Wall`. Fixes #11451. Test Plan: ./validate Reviewers: goldfire, ekmett, austin, hvr, simonpj, bgamari Reviewed By: simonpj, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1825 GHC Trac Issues: #11451
* Implement -Wunrecognised-warning-flagBen Gamari2016-01-251-0/+7
| | | | | | | | | | | | | | | | | This allows the user to avoid warnings for warning flags that GHC doesn't recognise. See #11429 for details.. Test Plan: Validate with T11429[abc] tests Reviewers: austin, hvr Reviewed By: hvr Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1830 GHC Trac Issues: #11429
* Rename -Wmissing-monadfail-instance to plural-formHerbert Valerio Riedel2016-01-251-2/+2
| | | | | | | | | | | | | | | | | | | This warning flag was recently introduced as part of #10751. However, it was missed during code-review that almost all existing warning flags use a plural-form, so for consistency this commit renames that warning flag to `-Wmissing-monadfail-instances`. Test Plan: local validate (still running) Reviewers: quchen, goldfire, austin, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1842 GHC Trac Issues: #10751
* Implement `-Wnoncanonical-monadfail-instances` warningHerbert Valerio Riedel2016-01-241-0/+8
| | | | | | | | | | | | | | | | | | | | | | | | The MonadFail proposal implemented so far via #10751 only warns about missing `MonadFail` instances based on existence of failible pattern matches in `do`-blocks. However, based on the noncanonical Monad warnings implemented via #11150 we can provide a different mechanism for detecting missing `MonadFail` instances quite cheaply. That is, by checking for canonical `fail` definitions. In the case of `Monad`/`MonadFail`, we define the canonical implementation of `fail` to be such that the soft-deprecated method shall (iff overridden) be defined in terms of the non-deprecated method. Consequently, in case of `MonadFail`, the `Monad(fail)` method shall be defined as alias of the `MonadFail(fail)` method. This allows us at some distant point in the future to remove `fail` from the `Monad` class, while having GHC ignore/tolerate such literal canonical method definitions. Reviewed By: bgamari, RyanGlScott Differential Revision: https://phabricator.haskell.org/D1838
* User's guide: fix singular/plural typo in flagnamesHerbert Valerio Riedel2016-01-241-4/+4
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* mkUserGuidePart: Better flag cross-referencingBen Gamari2016-01-238-85/+86
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* users-guide: Begin documenting --frontendBen Gamari2016-01-191-1/+7
| | | | | | | | | | Reviewers: austin Subscribers: thomie, ezyang Differential Revision: https://phabricator.haskell.org/D1793 GHC Trac Issues: #11448
* Switch from -this-package-key to -this-unit-id.Edward Z. Yang2016-01-191-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A small cosmetic change, but we have to do a bit of work to actually support it: - Cabal submodule update, so that Cabal passes us -this-unit-id when we ask for it. This includes a Cabal renaming to be consistent with Unit ID, which makes ghc-pkg a bit more scrutable. - Build system is updated to use -this-unit-id rather than -this-package-key, to avoid deprecation warnings. Needs a version test so I resurrected the old test we had (sorry rwbarton!) - I've *undeprecated* -package-name, so that we are in the same state as GHC 7.10, since the "correct" flag will have only entered circulation in GHC 8.0. - I removed -package-key. Since we didn't deprecate -package-id I think this should not cause any problems for users; they can just change their code to use -package-id. - The package database is indexed by UNIT IDs, not component IDs. I updated the naming here. - I dropped the signatures field from ExposedModule; nothing was using it, and instantiatedWith from the package database field. - ghc-pkg was updated to use unit ID nomenclature, I removed the -package-key flags but I decided not to add any new flags for now. Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu> Test Plan: validate Reviewers: austin, hvr, bgamari Reviewed By: bgamari Subscribers: 23Skidoo, thomie, erikd Differential Revision: https://phabricator.haskell.org/D1780
* Rename InjectiveTypeFamilies to TypeFamilyDependenciesBen Gamari2016-01-141-2/+2
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* Add InjectiveTypeFamilies language extensionJan Stolarek2016-01-091-0/+8
| | | | | | | | | | | | | | | | | Previously injective type families were part of TypeFamilies. Now they are in a separate language extension. Test Plan: ./validate Reviewers: austin, bgamari, goldfire Reviewed By: bgamari Subscribers: goldfire, thomie Differential Revision: https://phabricator.haskell.org/D1750 GHC Trac Issues: #11381
* Adding flags: -ffull-guard-reasoning and too-many-guardsGeorge Karachalias2015-12-271-0/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Introduction of two new flags, for more precise control over the new pattern match checker's behaviour when reasoning about guards. This is supposed to address #11195 (and maybe more performance bugs related to the NP-Hardness of coverage checking). Expected behaviour: * When `-ffull-guard-reasoning` is on, run the new pattern match checker in its full power * When `-ffull-guard-reasoning` is off (the default), for every match, check a metric to see whether pattern match checking for it has high probability of being non performant (at the the moment we check whether the number of guards is over 20 but I would like to use a more precise measure in the future). If the probability is high: - Oversimplify the guards (less expressive but more performant) and run the checker, and - Issue a warning about the simplification that happened. A new flag `-Wtoo-many-guards/-Wno-too-many-guards` suppresses the warning about the simplification (useful when combined with -Werror). Test Plan: validate Reviewers: goldfire, austin, hvr, bgamari Reviewed By: bgamari Subscribers: mpickering, thomie Differential Revision: https://phabricator.haskell.org/D1676 GHC Trac Issues: #11195
* Add -fprint-typechecker-elaboration flag (fixes #10662)Eugene Akentyev2015-12-171-0/+6
| | | | | | | | | | | | Reviewers: thomie, austin, bgamari Reviewed By: thomie, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1625 GHC Trac Issues: #10662
* Add `-W(no-)xxx` aliases for `-f(no-)warn-xxx` flagsDavid Luposchainsky2015-12-161-98/+98
| | | | | | | | | | | | | | | | | | | | | | This also updates the user's guide to refer to the `-W`-based warning flags by default. Quoting the release note entry: | Warnings can now be controlled with `-W(no-)...` flags in addition to | the old `-f(no-)warn...` ones. This was done as the first part of a | rewrite of the warning system to provide better control over warnings, | better warning messages, and more common syntax compared to other | compilers. The old `-fwarn...`-based warning flags will remain | functional for the forseeable future. This is part of https://ghc.haskell.org/wiki/Design/Warnings and addresses #11218 Reviewed By: hvr, bgamari Differential Revision: https://phabricator.haskell.org/D1613
* Rename s/7.12.1/8.0.1/ two minor occurencesHerbert Valerio Riedel2015-12-081-1/+1
| | | | [skip ci]
* Implement new `-fwarn-noncanonical-monoid-instances`Herbert Valerio Riedel2015-12-061-0/+8
| | | | | | | | | | | | | | | | This is similiar to the `-fwarn-noncanonical-monad-instances` warning implemented via #11128, but applies to `Semigroup`/`Monoid` instead and the `(<>)`/`mappend` methods (of which `mappend` is planned to move out of `Monoid` at some point in the future being redundant and thus error-prone). This warning is contained in `-Wcompat` but not in `-Wall`. This addresses #11150 Reviewed By: quchen Differential Revision: https://phabricator.haskell.org/D1553
* Implement warnings for Semigroups as parent of MonoidDavid Luposchainsky2015-11-291-2/+9
| | | | | | | | | | | | | | | | | | | | | This patch is similar to the AMP patch (#8004), which offered two functions: 1. Warn when an instance of a class has been given, but the type does not have a certain superclass instance 2. Warn when top-level definitions conflict with future Prelude names These warnings are issued as part of the new `-Wcompat` warning group. Reviewers: hvr, ekmett, austin, bgamari Reviewed By: hvr, ekmett, bgamari Subscribers: ekmett, thomie Differential Revision: https://phabricator.haskell.org/D1539 GHC Trac Issues: #11139
* Implement new -XTemplateHaskellQuotes pragmaHerbert Valerio Riedel2015-11-291-0/+7
| | | | | | | | | | | | | | | | | | | | | | | | | Since f16ddcee0c64a92ab911a7841a8cf64e3ac671fd / D876, `ghc-stage1` supports a subset of `-XTemplateHaskell`, but since we need Cabal to be able detect (so `.cabal` files can be specified accordingly, see also GHC #11102 which omits `TemplateHaskell` from `--supported-extensions`) whether GHC provides full or only partial `-XTemplateHaskell` support, the proper way to accomplish this is to split off the quotation/non-splicing `TemplateHaskell` feature-subset into a new language pragma `TemplateHaskellQuotes`. Moreover, `-XTemplateHaskellQuotes` is considered safe under SafeHaskell This addresses #11121 Reviewers: goldfire, ezyang, dterei, austin, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1511 GHC Trac Issues: #11121
* Add -Wcompat warning flag groupDavid Luposchainsky2015-11-241-0/+7
| | | | | | | | | | | | Reviewers: hvr, austin, thomie, bgamari Reviewed By: hvr, austin, thomie, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1495 GHC Trac Issues: #11000
* Implement new `-fwarn-noncanonical-monad-instances`Herbert Valerio Riedel2015-11-241-0/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | Warn about incoherent/non-canonical 'Applicative'/'Monad' instance declarations. Specifically the following invariants are checked: In 'Monad' instances declarations warn if the any of the following conditions does not hold: * If `return` is overridden it must be canonical (i.e. `return = pure`). * If `(>>)` is overridden it must be canonical (i.e. `(>>) = (*>)`). In 'Applicative' instance declarations: * Warn if 'pure' is defined backwards (i.e. `pure = return`). * Warn if '(*>)' is defined backwards (i.e. `(*>) = (>>)`). NB, this warning flag is not enabled via `-Wall` nor `-Wcompat`. This addresses #11128 Reviewers: quchen, austin, bgamari Reviewed By: bgamari Differential Revision: https://phabricator.haskell.org/D1516
* Support multiple debug output levelsBen Gamari2015-11-231-0/+7
| | | | | | | | | We now only strip block information from DebugBlocks when compiling with `-g1`, intended to be used when only minimal debug information is desired. `-g2` is assumed when `-g` is passed without any integer argument. Differential Revision: https://phabricator.haskell.org/D1281
* Add -fwarn-missing-monadfail-instance to mkUserGuidePartBen Gamari2015-11-181-0/+7
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* Disable failed specialisation warnings by default & update documentation.Ben Gamari2015-11-181-0/+12
| | | | | | | | | | | | | | | | | | These were far too noisy to enable by default. In the future we will hopefully have a more variant of -Wall targetted at these sorts of diagnostics. In the interim I've pointed out the existence of these options in the release notes in hopes that people will discover them. Test Plan: Validate Reviewers: hvr, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1492
* Implement function-sections for Haskell code, #8405Simon Brenner2015-11-121-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This adds a flag -split-sections that does similar things to -split-objs, but using sections in single object files instead of relying on the Satanic Splitter and other abominations. This is very similar to the GCC flags -ffunction-sections and -fdata-sections. The --gc-sections linker flag, which allows unused sections to actually be removed, is added to all link commands (if the linker supports it) so that space savings from having base compiled with sections can be realized. Supported both in LLVM and the native code-gen, in theory for all architectures, but really tested on x86 only. In the GHC build, a new SplitSections variable enables -split-sections for relevant parts of the build. Test Plan: validate with both settings of SplitSections Reviewers: dterei, Phyx, austin, simonmar, thomie, bgamari Reviewed By: simonmar, thomie, bgamari Subscribers: hsyl20, erikd, kgardas, thomie Differential Revision: https://phabricator.haskell.org/D1242 GHC Trac Issues: #8405
* Make worker-wrapper optionalChristiaan Baaij2015-10-271-1/+12
| | | | | | | | | | | | | | | | | | | Add -fworker-wrapper flag which enables the worker-wrapper transformation. It is implied by -O. The expected users of this flag, which includes myself, are GHC API users. In my Haskell-to-Hardware compiler, which uses the GHC API, I have seen no benifits of the worker-wrapper transformation. It does however induce longer compilation times. Further discussion can be seen here: https://mail.haskell.org/pipermail/ghc-devs/2015-October/010096.html Reviewed By: austin Differential Revision: https://phabricator.haskell.org/D1372 GHC Trac Issues: #11020
* Add flag to reverse errors in GHC/GHCiSiddhanathan Shanmugam2015-10-261-0/+7
| | | | | | | | | | | | Reviewers: austin, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1367 GHC Trac Issues: #10848
* Move orphan instance/rule warnings to typechecker/desugarer.Edward Z. Yang2015-10-081-2/+2
| | | | | | | | | | | | | | | | | | | | | | Summary: Instead of doing these warnings at MkIface time, we do them when we create the instances/rules in the typechecker/desugarer. Emitting warnings for auto-generated instances was a pain (since the specialization monad doesn't have the capacity to emit warnings) so instead I just deprecated -fwarn-auto-orphans. Auto rule orphans are pretty harmless anyway: they don't cause interface files to be eagerly loaded in. Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu> Test Plan: validate Reviewers: simonpj, austin, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1297
* Move user's guide to ReStructuredTextBen Gamari2015-10-0326-0/+2570
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