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* Deprecate Data.Version.versionTags (#2496)Thomas Miedema2014-11-221-1/+1
| | | | | | | | | | | | The library submission was accepted: http://www.haskell.org/pipermail/libraries/2014-September/023777.html The T5892ab testcases were changed to use `Data.Tree` instead of `Data.Version` Reviewed By: ekmett Differential Revision: https://phabricator.haskell.org/D395
* AST changes to prepare for API annotations, for #9628Alan Zimmerman2014-11-212-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | Summary: AST changes to prepare for API annotations Add locations to parts of the AST so that API annotations can then be added. The outline of the whole process is captured here https://ghc.haskell.org/trac/ghc/wiki/GhcAstAnnotations This change updates the haddock submodule. Test Plan: sh ./validate Reviewers: austin, simonpj, Mikolaj Reviewed By: simonpj, Mikolaj Subscribers: thomie, goldfire, carter Differential Revision: https://phabricator.haskell.org/D426 GHC Trac Issues: #9628
* Fix #7484, checking for good binder names in Convert.Richard Eisenberg2014-11-211-0/+0
| | | | | This commit also refactors a bunch of lexeme-oriented code into a new module Lexeme, and includes a submodule update for haddock.
* Split SynTyCon to SynonymTyCon and FamilyTyConJan Stolarek2014-11-201-0/+0
| | | | | | | | | | | | | | This patch refactors internal representation of type synonyms and type families by splitting them into two separate data constructors of TyCon data type. The main motivation is is that some fields make sense only for type synonyms and some make sense only for type families. This will be even more true with the upcoming injective type families. There is also some refactoring of names to keep the naming constistent. And thus tc_kind field has become tyConKind and tc_roles has become tcRoles. Both changes are not visible from the outside of TyCon module. Updates haddock submodule Reviewers: simonpj Differential Revision: https://phabricator.haskell.org/D508 GHC Trac Issues: #9812
* Add support for pattern synonym type signatures.Dr. ERDI Gergo2014-11-201-0/+0
| | | | | | | | | | | | Syntax is of the form pattern P :: (Prov b) => (Req a) => a -> b -> Int -> T a which declares a pattern synonym called `P`, with argument types `a`, `b`, and `Int`, and result type `T a`, with provided context `(Prov b)` and required context `(Req a)`. The Haddock submodule is also updated to use this new syntax in generated docs.
* Refactor: use System.FilePath.splitSearchPathThomas Miedema2014-11-191-23/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Summary: To address #2521 ("Trailing colon on GHC_PACKAGE_PATH doesn't work with ghc-pkg"), we were using a custom version of splitSearchPath (e4f46f5de). This solution however caused issue #9698 ("GHC_PACKAGE_PATH should be more lenient for empty paths"). This patch reverts back to System.FilePath.splitSearchPath (fixes #9698) and adresses (#2521) by testing for a trailing search path separators explicitly (instead of implicitly using empty search path elements). Empty paths are now allowed (ignored on Windows, interpreted as current directory on Posix systems), and trailing path separator still tack on the user and system package databases. Also update submodule filepath, which has a version of splitSearchPath which handles quotes in the same way as our custom version did. Test Plan: $ GHC_PACKAGE_PATH=/::/home: ./ghc-pkg list ... db stack: ["/",".","/home","<userdb>","<systemdb>"] ... Reviewers: austin Reviewed By: austin Subscribers: thomie, carter, simonmar Differential Revision: https://phabricator.haskell.org/D414 GHC Trac Issues: #2521, #9698
* Update to (unreleased) `deepseq-1.4.0.0`Herbert Valerio Riedel2014-11-151-0/+0
| | | | | | | | | | | | | | | | | | | This pulls in the new `Generic`-based `-XDefaultSignature`-based default implementation for `rnf`[1], and will be interesting to use in combination with the soon to be merged `-XDeriveAnyClass` extension. This requires updating several other submodules as well in order to relax the upper bound on `deepseq` and/or in a few cases to avoid relying on the default method implementation of `rnf`: - `Cabal` - `bytestring` - `containers` - `parallel` - `process` - `time` [1]: http://permalink.gmane.org/gmane.comp.lang.haskell.libraries/23031
* Generalize exposed-modules field in installed package databaseEdward Z. Yang2014-11-151-49/+74
| | | | | | | | | | | | | | | | | | | | | | | | | | Summary: Instead of recording exposed-modules and reexported-modules as seperate fields in the installed package database, this commit merges them into a single field (exposed-modules). The motivation for this change is in preparation for the inclusion of *signatures* into the installed package database, which may also be reexported. Merging the representation means that we can treat reexports uniformly, no matter if they're a normal module or a signature. This commit adds a stub for signatures, but that code isn't wired up to anything yet. Contains Cabal submodule update to accommodate these changes. Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu> Test Plan: validate Reviewers: simonpj, duncan, austin Subscribers: thomie, carter, simonmar Differential Revision: https://phabricator.haskell.org/D421
* Per-thread allocation counters and limitsSimon Marlow2014-11-121-0/+1
| | | | | | | | This reverts commit f0fcc41d755876a1b02d1c7c79f57515059f6417. New changes: now works on 32-bit platforms too. I added some basic support for 64-bit subtraction and comparison operations to the x86 NCG.
* Implement new integer-gmp2 from scratch (re #9281)Herbert Valerio Riedel2014-11-121-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is done as a separate `integer-gmp2` backend library because it turned out to become a complete rewrite from scratch. Due to the different (over)allocation scheme and potentially different accounting (via the new `{shrink,resize}MutableByteArray#` primitives), some of the nofib benchmarks actually results in increased allocation numbers (but not necessarily an increase in runtime!). I believe the allocation numbers could improve if `{resize,shrink}MutableByteArray#` could be optimised to reallocate in-place more efficiently. Here are the more apparent changes in the latest nofib comparision between `integer-gmp` and `integer-gmp2`: ------------------------------------------------------------------ Program Size Allocs Runtime Elapsed TotalMem ------------------------------------------------------------------ ... bernouilli +1.6% +15.3% 0.132 0.132 0.0% ... cryptarithm1 -2.2% 0.0% -9.7% -9.7% 0.0% ... fasta -0.7% -0.0% +10.9% +10.9% 0.0% ... kahan +0.6% +38.9% 0.169 0.169 0.0% ... lcss -0.7% -0.0% -6.4% -6.4% 0.0% ... mandel +1.6% +33.6% 0.049 0.049 0.0% ... pidigits +0.8% +8.5% +3.9% +3.9% 0.0% power +1.4% -23.8% -18.6% -18.6% -16.7% ... primetest +1.3% +50.1% 0.085 0.085 0.0% ... rsa +1.6% +53.4% 0.026 0.026 0.0% ... scs +1.2% +6.6% +6.5% +6.6% +14.3% ... symalg +1.0% +9.5% 0.010 0.010 0.0% ... transform -0.6% -0.0% -5.9% -5.9% 0.0% ... ------------------------------------------------------------------ Min -2.3% -23.8% -18.6% -18.6% -16.7% Max +1.6% +53.4% +10.9% +10.9% +14.3% Geometric Mean -0.3% +1.9% -0.8% -0.8% +0.0% (see P35 / https://phabricator.haskell.org/P35 for full report) By default, `INTEGER_LIBRARY=integer-gmp2` is active now, which results in the package `integer-gmp-1.0.0.0` being registered in the package db. The previous `integer-gmp-0.5.1.0` can be restored by setting `INTEGER_LIBRARY=integer-gmp` (but will probably be removed altogether for GHC 7.12). In-tree GMP support has been stolen from the old `integer-gmp` (while unpatching the custom memory-allocators, as well as forcing `-fPIC`) A minor hack to `ghc-cabal` was necessary in order to support two different `integer-gmp` packages (in different folders) with the same package key. There will be a couple of follow-up commits re-implementing some features that were dropped to keep D82 minimal, as well as further clean-ups/improvements. More information can be found via #9281 and https://ghc.haskell.org/trac/ghc/wiki/Design/IntegerGmp2 Reviewed By: austin, rwbarton, simonmar Differential Revision: https://phabricator.haskell.org/D82
* Use bracket in `withCurrentDirectory`Konstantin Zudov2014-11-071-6/+3
| | | | | | | | | | | | Summary: There was a comment about that. Seems like a better behaviour. Reviewers: austin Reviewed By: austin Subscribers: thomie, carter, simonmar Differential Revision: https://phabricator.haskell.org/D419
* Fix comment about dropWhileEndLEJoachim Breitner2014-11-011-1/+1
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* Fix build via Haddock submodule update.Austin Seipp2014-10-311-0/+0
| | | | Signed-off-by: Austin Seipp <austin@well-typed.com>
* remove old .NET related codeYuras Shumovich2014-10-311-0/+0
| | | | | | | | | | | | | | Summary: It seems to be dead anyway. Also update Haddock submodule. Test Plan: validate Reviewers: austin Reviewed By: austin Subscribers: thomie, goldfire, carter, simonmar Differential Revision: https://phabricator.haskell.org/D357
* Update Haddock submoduleHerbert Valerio Riedel2014-10-311-0/+0
| | | | | This pulls in a change to have the new "Examples" sections being in `base` collapsed by default.
* hsc2hs: Update submoduleAustin Seipp2014-10-291-0/+0
| | | | | | | | | This makes sure the --cross-compile mode can handle negative enum values. Differential Revision: https://phabricator.haskell.org/D301 Signed-off-by: Austin Seipp <austin@well-typed.com>
* Update Haddock submodule for collapsible section supportHerbert Valerio Riedel2014-10-291-0/+0
| | | | | This also updates a few occurences of recently added "Example" headings to make use of this new feature for testing
* Use objdump instead of nm to derive constants on OpenBSDAustin Seipp2014-10-211-1/+5
| | | | | | | | | | | | | | | | Summary: OpenBSD's nm doesn't support the -P option and there appears to be no other way to get the desired information from it. Reviewers: kgardas, #ghc, austin Reviewed By: kgardas, #ghc, austin Subscribers: austin, ggreif Projects: #ghc Differential Revision: https://phabricator.haskell.org/D332 GHC Trac Issues: #9549
* Update Haddock submoduleAustin Seipp2014-10-201-0/+0
| | | | | | | | As requested by Yuras Shumovich, this updates Haddock to include .arcconfig and .arclint files, so diffs for GHC patches can go into Phabricator. Signed-off-by: Austin Seipp <austin@well-typed.com>
* Python 3 support, second attempt (Trac #9184)Krzysztof Gogolewski2014-10-191-3/+5
| | | | | | | | | | | | | | | | | | | | | | | | Summary: This is a fixup of https://phabricator.haskell.org/D233 The only difference is in findTFiles (first commit), which previously broke Windows runner; now I translated literally instead attempting to improve it, and checked it works. Test Plan: I used validate under 2,3 on Linux and under 2 on msys2. On Windows I've seen a large number of failures, but they don't seem to be connected with the patch. Reviewers: hvr, simonmar, thomie, austin Reviewed By: austin Subscribers: thomie, carter, ezyang, simonmar Differential Revision: https://phabricator.haskell.org/D310 GHC Trac Issues: #9184
* Update haddock submodule with lazy IO fix.Edward Z. Yang2014-10-091-0/+0
| | | | Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
* Revert "Basic Python 3 support for testsuite driver (Trac #9184)"Krzysztof Gogolewski2014-10-031-5/+3
| | | | | | This reverts commit 084d241b316bfa12e41fc34cae993ca276bf0730. This is a possible culprit of Windows breakage reported at ghc-devs.
* Use dropWhileEndLE p instead of reverse . dropWhile p . reverseDavid Feuer2014-10-022-6/+23
| | | | | | | | | | | | | | | | | | | | | | | | Summary: Using `dropWhileEndLE` tends to be faster and easier to read than the `reverse . dropWhile p . reverse` idiom. This also cleans up some other, nearby, messes. Fix #9616 (incorrect number formatting potentially leading to incorrect numbers in output). Test Plan: Run validate Reviewers: thomie, rwbarton, nomeata, austin Reviewed By: nomeata, austin Subscribers: simonmar, ezyang, carter, thomie Projects: #ghc Differential Revision: https://phabricator.haskell.org/D259 GHC Trac Issues: #9623, #9616 Conflicts: compiler/basicTypes/OccName.lhs
* Revert "Use dropWhileEndLE p instead of reverse . dropWhile p . reverse"Austin Seipp2014-10-022-23/+6
| | | | This reverts commit 2a8856884de7d476e26b4ffa829ccb3a14d6f63e.
* Basic Python 3 support for testsuite driver (Trac #9184)Krzysztof Gogolewski2014-10-011-3/+5
| | | | | | | | | | | | | | | | | | | | | | | | Summary: Most of the changes is adaptation of old Python 2 only code. My priority was not breaking Python 2, and so I avoided bigger changes to the driver. In particular, under Python 3 the output is a str and buffering cannot be disabled. To test, define PYTHON=python3 in testsuite/mk/boilerplate.mk. Thanks to aspidites <emarshall85@gmail.com> who provided the initial patch. Test Plan: validate under 2 and 3 Reviewers: hvr, simonmar, thomie, austin Reviewed By: thomie, austin Subscribers: aspidites, thomie, simonmar, ezyang, carter Differential Revision: https://phabricator.haskell.org/D233 GHC Trac Issues: #9184
* Use dropWhileEndLE p instead of reverse . dropWhile p . reverseDavid Feuer2014-10-012-6/+23
| | | | | | | | | | | | | | | | | | | | | | | | Summary: Using `dropWhileEndLE` tends to be faster and easier to read than the `reverse . dropWhile p . reverse` idiom. This also cleans up some other, nearby, messes. Fix #9616 (incorrect number formatting potentially leading to incorrect numbers in output). Test Plan: Run validate Reviewers: thomie, rwbarton, nomeata, austin Reviewed By: nomeata, austin Subscribers: simonmar, ezyang, carter, thomie Projects: #ghc Differential Revision: https://phabricator.haskell.org/D259 GHC Trac Issues: #9623, #9616 Conflicts: compiler/basicTypes/OccName.lhs
* Update hsc2hs submoduleJoachim Breitner2014-10-011-0/+0
| | | | to get David’s code improvements (#9654).
* Don't re-export `Alternative(..)` from Control.Monad (re #9586)Herbert Valerio Riedel2014-09-261-0/+0
| | | | | | | | | | | | | | | | | This was done in d94de87252d0fe2ae97341d186b03a2fbe136b04 to avoid orphans but since a94dc4c3067c6a0925e2e39f35ef0930771535f1 moved `Alternative` into GHC.Base, this isn't needed anymore. This is important, as otherwise this would require a non-neglectable amount of `Control.Monad hiding ((<|>), empty)` imports in user code. The Haddock submodule is updated as well Test Plan: partial local ./validate --fast, let Harbormaster doublecheck it Reviewed By: ekmett, austin Differential Revision: https://phabricator.haskell.org/D248
* Update Cabal submodule & ghc-pkg to use new module re-export typesEdward Z. Yang2014-09-243-204/+78
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Summary: The main change is that Cabal changed the representation of module re-exports to distinguish reexports in source .cabal files versus re-exports in installed package registraion files. Cabal now also does the resolution of re-exports to specific installed packages itself, so ghc-pkg no longer has to do this. This is a cleaner design overall because re-export resolution can fail so it is better to do it during package configuration rather than package registration. It also simplifies the re-export representation that ghc-pkg has to use. Add extra ghc-pkg sanity check for module re-exports and duplicates For re-exports, check that the defining package exists and that it exposes the defining module (or for self-rexport exposed or hidden modules). Also check that the defining package is actually a direct or indirect dependency of the package doing the re-exporting. Also add a check for duplicate modules in a package, including re-exported modules. Test Plan: So far the sanity checks are totally untested. Should add some test case to make sure the sanity checks do catch things correctly, and don't ban legal things. Reviewers: austin, duncan Subscribers: angerman, simonmar, ezyang, carter Differential Revision: https://phabricator.haskell.org/D183 GHC Trac Issues:
* Change all hashbangs to /usr/bin/env (#9057)Thomas Miedema2014-09-232-2/+2
| | | | | | | | | | | | | | | | | | Summary: ``` git grep -l '#!' | xargs sed -i 's|#!.*/bin/\([^ ]*\)$|#!/usr/bin/env \1|' ``` and some manual tweaking Test Plan: harbormaster Reviewers: austin Subscribers: hvr, simonmar, ezyang, carter Differential Revision: https://phabricator.haskell.org/D237 GHC Trac Issues: #9057
* Export `Monoid(..)`/`Foldable(..)`/`Traversable(..)` from PreludeHerbert Valerio Riedel2014-09-212-2/+0
| | | | | | | | | | | | | | | This finally exposes also the methods of these 3 classes in the Prelude in order to allow to define basic class instances w/o needing imports. This almost completes the primary goal of #9586 NOTE: `fold`, `foldl'`, `foldr'`, and `toList` are not exposed yet, as they require upstream fixes for at least `containers` and `bytestring`, and are not required for defining basic instances. Reviewed By: ekmett, austin Differential Revision: https://phabricator.haskell.org/D236
* Update haddock submodule (miscellaneous fixes)Edward Z. Yang2014-09-181-0/+0
| | | | Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
* Add -fwarn-context-quantification (#4426)Krzysztof Gogolewski2014-09-181-0/+0
| | | | | | | | | | | | | | | | | | | | | | Summary: This warning (enabled by default) reports places where a context implicitly binds a type variable, for example type T a = {-forall m.-} Monad m => a -> m a Also update Haddock submodule. Test Plan: validate Reviewers: hvr, goldfire, simonpj, austin Reviewed By: austin Subscribers: simonmar, ezyang, carter Differential Revision: https://phabricator.haskell.org/D211 GHC Trac Issues: #4426
* Revert "Update haddock submodule for package key fix."Edward Z. Yang2014-09-181-0/+0
| | | | This reverts commit a8d7f81d1f6a9ea658c6f1a965bb3e7717b11e40.
* Update haddock submodule for package key fix.Edward Z. Yang2014-09-181-0/+0
| | | | Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
* Bump `base` version to 4.8.0.0 for realHerbert Valerio Riedel2014-09-091-0/+0
| | | | | | | | | | | | | | | | This commit updates several submodules in order to bump the upper bounds on `base` of most boot packages Moreover, this updates some of the test-suite cases which have version numbers hardcoded within. However, I'm not sure if this commit didn't introduce the following two test-failures ghc-api T8628 [bad stdout] (normal) ghc-api T8639_api [bad stdout] (normal) This needs investigation
* Make Applicative a superclass of MonadAustin Seipp2014-09-093-0/+2
| | | | | | | | | | | | | | | | | | | | | Summary: This includes pretty much all the changes needed to make `Applicative` a superclass of `Monad` finally. There's mostly reshuffling in the interests of avoid orphans and boot files, but luckily we can resolve all of them, pretty much. The only catch was that Alternative/MonadPlus also had to go into Prelude to avoid this. As a result, we must update the hsc2hs and haddock submodules. Signed-off-by: Austin Seipp <austin@well-typed.com> Test Plan: Build things, they might not explode horribly. Reviewers: hvr, simonmar Subscribers: simonmar Differential Revision: https://phabricator.haskell.org/D13
* PostTcType replaced with TypeAnnotAlan Zimmerman2014-09-061-0/+0
| | | | | | | | | | | | | | | | | | | | | Summary: This is a first step toward allowing generic traversals of the AST without 'landmines', by removing the `panic`s located throughout `placeHolderType`, `placeHolderKind` & co. See more on the discussion at https://www.mail-archive.com/ghc-devs@haskell.org/msg05564.html (This also makes a corresponding update to the `haddock` submodule.) Test Plan: `sh validate` and new tests pass. Reviewers: austin, simonpj, goldfire Reviewed By: austin, simonpj, goldfire Subscribers: edsko, Fuuzetsu, thomasw, holzensp, goldfire, simonmar, relrod, ezyang, carter Projects: #ghc Differential Revision: https://phabricator.haskell.org/D157
* genprimopcode: GHC.Prim is Unsafe (#9449)Austin Seipp2014-09-011-4/+8
| | | | | | | | | | | | | | | | | | | | | | | | Summary: Make sure the documentation for `GHC.Prim` adequately reflects the fact it is unsafe. Also clean up some 80-column violations. Signed-off-by: Austin Seipp <austin@well-typed.com> Test Plan: Build documentation, check `GHC.Prim`. It's properly marked as `Unsafe`. Reviewers: hvr, goldfire, ezyang Reviewed By: ezyang Subscribers: nomeata, simonmar, ezyang, carter Differential Revision: https://phabricator.haskell.org/D182 GHC Trac Issues: #9449
* Re-export Word from Prelude (re #9531)Herbert Valerio Riedel2014-08-311-0/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The original proposal text can be found at http://www.haskell.org/pipermail/libraries/2014-August/023491.html The proposal passed with a clear majority, and was additionally confirmed by the core libraries committee. *Compatibility Note* Only code that imports `Data.Word` for the sole purpose of using `Word` *and* requires to be `-Werror`-clean (due to `-fwarn-unused-imports`) is affected by this change. In order to write warning-free forward/backward compatible against `base`, a variant of the following CPP-based snippet can be used: -- Starting with base>4.7.0 or GHC>7.8 Prelude re-exports 'Word' -- The following is needed, if 'Word' is the *only* entity needed from Data.Word #ifdef MIN_VERSION_base # if !MIN_VERSION_base(4,7,1) import Data.Word (Word) # endif -- no cabal_macros.h -- fallback to __GLASGOW_HASKELL__ #elif __GLASGOW_HASKELL__ < 709 import Data.Word (Word) #endif This also updates the haddock submodule in order to avoid a compile warning
* Fix a few minor issues spotted in code reviewDuncan Coutts2014-08-291-2/+1
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* Update Cabal and haddock submodules to follow the Canal-dep removal changesDuncan Coutts2014-08-291-0/+0
| | | | | | In particular, Cabal was still in one place using old file-style package databases. Haddock just needed simple changes to follow the change of representation of packages in the ghc library.
* Address a number of Edward's code review commentsDuncan Coutts2014-08-291-6/+11
| | | | Some others addressed as part of other recent patches.
* Fix string conversions in ghc-pkg to be correct w.r.t. UnicodeDuncan Coutts2014-08-291-4/+5
| | | | | Similar change to that on the ghc library side in the previous patch. The BinaryStringRep class has to use a ByteString in UTF8 encoding.
* Fix long lines and trailing whitespaceDuncan Coutts2014-08-291-35/+48
| | | | in the previous patches in this series
* Fix warnings arising from the package db refactoringDuncan Coutts2014-08-291-5/+1
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* Move Cabal Binary instances from bin-package-db to ghc-pkg itselfDuncan Coutts2014-08-291-5/+147
| | | | | The ghc-pkg program of course still depends on Cabal, it's just the bin-package-db library (shared between ghc and ghc-pkg) that does not.
* Use ghc-local types for packages, rather than Cabal typesDuncan Coutts2014-08-291-6/+54
| | | | | | | | Also start using the new package db file format properly, by using the ghc-specific section. This is the main patch in the series for removing the compiler's dep on the Cabal lib.
* Introduce new file format for the package database binary cacheDuncan Coutts2014-08-291-22/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | The purpose of the new format is to make it possible for the compiler to not depend on the Cabal library. The new cache file format contains more or less the same information duplicated in two different sections using different representations. One section is basically the same as what the package db contains now, a list of packages using the types defined in the Cabal library. This section is read back by ghc-pkg, and used for things like ghc-pkg dump which have to produce output using the Cabal InstalledPackageInfo text representation. The other section is a ghc-local type which contains a subset of the information from the Cabal InstalledPackageInfo -- just the bits that the compiler cares about. The trick is that the compiler can read this second section without needing to know the representation (or types) of the first part. The ghc-pkg tool knows about both representations and writes both. This patch introduces the new cache file format but does not yet use it properly. More patches to follow. (As of this patch, the compiler reads the part intended for ghc-pkg so it still depends on Cabal and the ghc-local package type is not yet fully defined.)
* Improve the ghc-pkg warnings for missing and out of date package cache filesDuncan Coutts2014-08-291-23/+38
| | | | | | In particular, report when it's missing, and also report it for ghc-pkg check. Also make the warning message more explicit, that ghc will not be able to read these dbs, even though ghc-pkg may be able to.
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