Cheng Shao pushed to branch wip/andreask/hadrian_ghc_rsp_file at Glasgow Haskell Compiler / GHC Commits: 3c2f4bb4 by sheaf at 2025-11-11T11:47:28-05:00 Preserve user-written kinds in data declarations This commit ensures that we preserve the user-written kind for data declarations, e.g. in type T2T = Type -> Type type D :: T2T data D a where { .. } that we preserve the user-written kind of D as 'T2T', instead of expanding the type synonym 'T2T' during kind checking. We do this by storing 'tyConKind' separately from 'tyConResKind'. This means that 'tyConKind' is not necessarily equal to 'mkTyConKind binders res_kind', as e.g. in the above example the former is 'T2T' while the latter is 'Type -> Type'. This is explained in Note [Preserve user-written TyCon kind] in GHC.Core.TyCon. This is particularly important for Haddock, as the kinds stored in interface files affect the generated documentation, and we want to preserve the user-written types as much as possible. - - - - - 19859584 by sheaf at 2025-11-11T11:47:28-05:00 Store user-written datacon tvs in interface files This commit ensures we store the user-written quantified type variables of data constructors in interface files, e.g. in data D a where MkD1 :: forall x. x -> D x MkD2 :: forall u v. u -> v -> D v The previous behaviour was to rename the universal variables to match the universal variables of the data constructor. This was undesirable because the names that end up in interface files end up mattering for generated Haddock documentation; it's better to preserve the user-written type variables. Moreover, the universal variables may not have been user-written at all, e.g. in an example such as: type T2T = Type -> Type data G :: T2T where MkG :: forall x. D x Here GHC will invent the type variable name 'a' for the first binder of the TyCon G. We really don't want to then rename the user-written 'x' into the generated 'a'. - - - - - 034b2056 by sheaf at 2025-11-11T11:47:28-05:00 DataCon univ_tvs names: pick TyCon over inferred This commit changes how we compute the names of universal type variables in GADT data constructors. This augments the existing logic that chose which type variable name to use, in GHC.Tc.TyCl.mkGADTVars. We continue to prefer DataCon tv names for user-written binders, but we now prefer TyCon tv names for inferred (non-user-written) DataCon binders. This makes a difference in examples such as: type (:~~:) :: k1 -> k2 -> Type data a :~~: b where HRefl :: a :~~: a Before this patch, we ended up giving HRefl the type: forall {k2}. forall (a :: k2). a :~~: a whereas we now give it the type: forall {k1}. forall (a :: k1). a :~~: a The important part isn't really 'k1' or 'k2', but more that the inferred type variable names of the DataCon can be arbitrary/unpredictable (as they are chosen by GHC and depend on how unification proceeds), so it's much better to use the more predictable TyCon type variable names. - - - - - 95078d00 by sheaf at 2025-11-11T11:47:28-05:00 Backpack Rename: use explicit record construction This commit updates the Backpack boilerplate in GHC.Iface.Rename to use explicit record construction rather than record update. This makes sure that the code stays up to date when the underlying constructors change (e.g. new fields are added). The rationale is further explained in Note [Prefer explicit record construction]. - - - - - 2bf36263 by sheaf at 2025-11-11T11:47:28-05:00 Store # eta binders in TyCon and use for Haddock This commit stores the number of TyCon binders that were introduced by eta-expansion (by the function GHC.Tc.Gen.HsType.splitTyConKind). This is then used to pretty-print the TyCon as the user wrote it, e.g. for type Effect :: (Type -> Type) -> Type -> Type data State s :: Effect where {..} -- arity 3 GHC will eta-expand the data declaration to data State s a b where {..} but also store in the 'TyCon' that the number of binders introduced by this eta expansion is 2. This allows us, in 'Haddock.Convert.synifyTyConKindSig', to recover the original user-written syntax, preserving the user's intent in Haddock documentation. See Note [Inline kind signatures with GADTSyntax] in Haddock.Convert. - - - - - 6c91582f by Matthew Pickering at 2025-11-11T11:48:12-05:00 driver: Properly handle errors during LinkNode steps Previously we were not properly catching errors during the LinkNode step (see T9930fail test). This is fixed by wrapping the `LinkNode` action in `wrapAction`, the same handler which is used for module compilation. Fixes #26496 - - - - - e1e1eb32 by Matthew Pickering at 2025-11-11T11:48:54-05:00 driver: Remove unecessary call to hscInsertHPT This call was left-over from e9445c013fbccf9318739ca3d095a3e0a2e1be8a If you follow the functions which call `upsweep_mod`, they immediately add the interface to the HomePackageTable when `upsweep_mod` returns. - - - - - b22777d4 by ARATA Mizuki at 2025-11-11T11:49:44-05:00 LLVM backend: Pass the +evex512 attribute to LLVM 18+ if -mavx512f is set The newer LLVM requires the +evex512 attribute to enable use of ZMM registers. LLVM exhibits a backward-compatible behavior if the cpu is `x86-64`, but not if `penryn`. Therefore, on macOS, where the cpu is set to `penryn`, we need to explicitly pass +evex512. Fixes #26410 - - - - - 6ead7d06 by Vladislav Zavialov at 2025-11-11T11:50:26-05:00 Comments only in GHC.Parser.PostProcess.Haddock Remove outdated Note [Register keyword location], as the issue it describes was addressed by commit 05eb50dff2fcc78d025e77b9418ddb369db49b9f. - - - - - 43fa8be8 by sheaf at 2025-11-11T11:51:18-05:00 localRegistersConflict: account for assignment LHS This commit fixes a serious oversight in GHC.Cmm.Sink.conflicts, specifically the code that computes which local registers conflict between an assignment and a Cmm statement. If we have: assignment: <local_reg> = <expr> node: <local_reg> = <other_expr> then clearly the two conflict, because we cannot move one statement past the other, as they assign two different values to the same local register. (Recall that 'conflicts (local_reg,expr) node' is False if and only if the assignment 'local_reg = expr' can be safely commuted past the statement 'node'.) The fix is to update 'GHC.Cmm.Sink.localRegistersConflict' to take into account the following two situations: (1) 'node' defines the LHS local register of the assignment, (2) 'node' defines a local register used in the RHS of the assignment. The bug is precisely that we were previously missing condition (1). Fixes #26550 - - - - - 79dfcfe0 by sheaf at 2025-11-11T11:51:18-05:00 Update assigned register format when spilling When we come to spilling a register to put new data into it, in GHC.CmmToAsm.Reg.Linear.allocRegsAndSpill_spill, we need to: 1. Spill the data currently in the register. That is, do a spill with a format that matches what's currently in the register. 2. Update the register assignment, allocating a virtual register to this real register, but crucially **updating the format** of this assignment. Due to shadowing in the Haskell code for allocRegsAndSpill_spill, we were mistakenly re-using the old format. This could lead to a situation where: a. We were using xmm6 to store a Double#. b. We want to store a DoubleX2# into xmm6, so we spill the current content of xmm6 to the stack using a scalar move (correct). c. We update the register assignment, but we fail to update the format of the assignment, so we continue to think that xmm6 stores a Double# and not a DoubleX2#. d. Later on, we need to spill xmm6 because it is getting clobbered by another instruction. We then decide to only spill the lower 64 bits of the register, because we still think that xmm6 only stores a Double# and not a DoubleX2#. Fixes #26542 - - - - - aada5db9 by ARATA Mizuki at 2025-11-11T11:52:07-05:00 Fix the order of spill/reload instructions The AArch64 NCG could emit multiple instructions for a single spill/reload, but their order was not consistent between the definition and a use. Fixes #26537 Co-authored-by: sheaf <sam.derbyshire@gmail.com> - - - - - 64ec82ff by Andreas Klebinger at 2025-11-11T11:52:48-05:00 Add hpc to release script - - - - - 741da00c by Ben Gamari at 2025-11-12T03:38:20-05:00 template-haskell: Better describe getQ semantics Clarify that the state is a type-indexed map, as suggested by #26484. - - - - - 8b080e04 by ARATA Mizuki at 2025-11-12T03:39:11-05:00 Fix incorrect markups in the User's Guide * Correct markup for C--: "C-\-" in reST * Fix internal links * Fix code highlighting * Fix inline code: Use ``code`` rather than `code` * Remove extra backslashes Fixes #16812 Co-authored-by: sheaf <sam.derbyshire@gmail.com> - - - - - a00840ea by Simon Peyton Jones at 2025-11-14T15:23:56+00:00 Make TYPE and CONSTRAINT apart again This patch finally fixes #24279. * The story started with #11715 * Then #21623 articulated a plan, which made Type and Constraint not-apart; a horrible hack but it worked. The main patch was commit 778c6adca2c995cd8a1b84394d4d5ca26b915dac Author: Simon Peyton Jones <simonpj@microsoft.com> Date: Wed Nov 9 10:33:22 2022 +0000 Type vs Constraint: finally nailed * #24279 reported a bug in the above big commit; this small patch fixes it commit af6932d6c068361c6ae300d52e72fbe13f8e1f18 Author: Simon Peyton Jones <simon.peytonjones@gmail.com> Date: Mon Jan 8 10:49:49 2024 +0000 Make TYPE and CONSTRAINT not-apart Issue #24279 showed up a bug in the logic in GHC.Core.Unify.unify_ty which is supposed to make TYPE and CONSTRAINT be not-apart. * Then !10479 implemented "unary classes". * That change in turn allows us to make Type and Constraint apart again, cleaning up the compiler and allowing a little bit more expressiveness. It fixes the original hope in #24279, namely that `Type` and `Constraint` should be distinct throughout. - - - - - c0a1e574 by Georgios Karachalias at 2025-11-15T05:14:31-05:00 Report all missing modules with -M We now report all missing modules at once in GHC.Driver.Makefile.processDeps, as opposed to only reporting a single missing module. Fixes #26551. - - - - - c9fa3449 by Sylvain Henry at 2025-11-15T05:15:26-05:00 JS: fix array index for registers We used to store R32 in h$regs[-1]. While it's correct in JavaScript, fix this to store R32 in h$regs[0] instead. - - - - - 9e469909 by Sylvain Henry at 2025-11-15T05:15:26-05:00 JS: support more than 128 registers (#26558) The JS backend only supported 128 registers (JS variables/array slots used to pass function arguments). It failed in T26537 when 129 registers were required. This commit adds support for more than 128 registers: it is now limited to maxBound :: Int (compiler's Int). If we ever go above this threshold the compiler now panics with a more descriptive message. A few built-in JS functions were assuming 128 registers and have been rewritten to use loops. Note that loops are only used for "high" registers that are stored in an array: the 31 "low" registers are still handled with JS global variables and with explicit switch-cases to maintain good performance in the most common cases (i.e. few registers used). Adjusting the number of low registers is now easy: just one constant to adjust (GHC.StgToJS.Regs.lowRegsCount). No new test added: T26537 is used as a regression test instead. - - - - - 0a64a78b by Sven Tennie at 2025-11-15T20:31:10-05:00 AArch64: Simplify CmmAssign and CmmStore The special handling for floats was fake: The general case is always used. So, the additional code path isn't needed (and only adds complexity for the reader.) - - - - - 15b311be by sheaf at 2025-11-15T20:32:02-05:00 SimpleOpt: refactor & push coercions into lambdas This commit improves the simple optimiser (in GHC.Core.SimpleOpt) in a couple of ways: - The logic to push coercion lambdas is shored up. The function 'pushCoercionIntoLambda' used to be called in 'finish_app', but this meant we could not continue to optimise the program after performing this transformation. Now, we call 'pushCoercionIntoLambda' as part of 'simple_app'. Doing so can be important when dealing with unlifted newtypes, as explained in Note [Desugaring unlifted newtypes]. - The code is re-structured to avoid duplication and out-of-sync code paths. Now, 'simple_opt_expr' defers to 'simple_app' for the 'App', 'Var', 'Cast' and 'Lam' cases. This means all the logic for those is centralised in a single place (e.g. the 'go_lam' helper function). To do this, the general structure is brought a bit closer to the full-blown simplifier, with a notion of 'continuation' (see 'SimpleContItem'). This commit also modifies GHC.Core.Opt.Arity.pushCoercionIntoLambda to apply a substitution (a slight generalisation of its existing implementation). - - - - - b33284c7 by sheaf at 2025-11-15T20:32:02-05:00 Improve typechecking of data constructors This commit changes the way in which we perform typecheck data constructors, in particular how we make multiplicities line up. Now, impedance matching occurs as part of the existing subsumption machinery. See the revamped Note [Typechecking data constructors] in GHC.Tc.Gen.App, as well as Note [Polymorphisation of linear fields] in GHC.Core.Multiplicity. This allows us to get rid of a fair amount of hacky code that was added with the introduction of LinearTypes; in particular the logic of GHC.Tc.Gen.Head.tcInferDataCon. ------------------------- Metric Decrease: T10421 T14766 T15164 T15703 T19695 T5642 T9630 WWRec ------------------------- - - - - - b6faf5d0 by sheaf at 2025-11-15T20:32:02-05:00 Handle unsaturated rep-poly newtypes This commit allows GHC to handle unsaturated occurrences of unlifted newtype constructors. The plan is detailed in Note [Eta-expanding rep-poly unlifted newtypes] in GHC.Tc.Utils.Concrete: for unsaturated unlifted newtypes, we perform the appropriate representation-polymorphism check in tcInstFun. - - - - - 682bf979 by Mike Pilgrem at 2025-11-16T16:44:14+00:00 Fix #26293 Valid stack.yaml for hadrian - - - - - acc70c3a by Simon Peyton Jones at 2025-11-18T16:21:20-05:00 Fix a bug in defaulting Addresses #26582 Defaulting was doing some unification but then failing to iterate. Silly. I discovered that the main solver was unnecessarily iterating even if there was a unification for an /outer/ unification variable, so I fixed that too. - - - - - c12fa73e by Simon Peyton Jones at 2025-11-19T02:55:01-05:00 Make PmLit be in Ord, and use it in Map This MR addresses #26514, by changing from data PmAltConSet = PACS !(UniqDSet ConLike) ![PmLit] to data PmAltConSet = PACS !(UniqDSet ConLike) !(Map PmLit PmLit) This matters when doing pattern-match overlap checking, when there is a very large set of patterns. For most programs it makes no difference at all. For the N=5000 case of the repro case in #26514, compiler mutator time (with `-fno-code`) goes from 1.9s to 0.43s. All for the price for an Ord instance for PmLit - - - - - 41b84f40 by sheaf at 2025-11-19T02:55:52-05:00 Add passing tests for #26311 and #26072 This commit adds two tests cases that now pass since landing the changes to typechecking of data constructors in b33284c7. Fixes #26072 #26311 - - - - - 1faa758a by sheaf at 2025-11-19T02:55:52-05:00 mkCast: weaken bad cast warning for multiplicity This commit weakens the warning message emitted when constructing a bad cast in mkCast to ignore multiplicity. Justification: since b33284c7, GHC uses sub-multiplicity coercions to typecheck data constructors. The coercion optimiser is free to discard these coercions, both for performance reasons, and because GHC's Core simplifier does not (yet) preserve linearity. We thus weaken 'mkCast' to use 'eqTypeIgnoringMultiplicity' instead of 'eqType', to avoid getting many spurious warnings about mismatched multiplicities. - - - - - 55eab80d by Sylvain Henry at 2025-11-20T17:33:13-05:00 Build external interpreter program on demand (#24731) This patch teaches GHC how to build the external interpreter program when it is missing. As long as we have the `ghci` library, doing this is trivial so most of this patch is refactoring for doing it sanely. - - - - - 08bbc028 by Rodrigo Mesquita at 2025-11-20T17:33:54-05:00 Add tests for #23973 and #26565 These were fixed by 4af4f0f070f83f948e49ad5d7835fd91b8d3f0e6 in !10417 - - - - - 6b42232c by sheaf at 2025-11-20T17:34:35-05:00 Mark T26410_ffi as fragile on Windows As seen in #26595, this test intermittently fails on Windows. This commit marks it as fragile, until we get around to fixing it. - - - - - b7b7c049 by Andrew Lelechenko at 2025-11-21T21:04:01+00:00 Add nubOrd / nubOrdBy to Data.List and Data.List.NonEmpty As per https://github.com/haskell/core-libraries-committee/issues/336 - - - - - 352d5462 by Marc Scholten at 2025-11-22T10:33:03-05:00 Fix haddock test runner to handle UTF-8 output xhtml 3000.4.0.0 now produces UTF-8 output instead of escaping non-ASCII characters. When using --test-accept it previously wrote files in the wrong encoding because they have not been decoded properly when reading the files. - - - - - 48a3ed57 by Simon Peyton Jones at 2025-11-25T15:33:54+00:00 Add a fast-path for args=[] to occAnalApp In the common case of having not arguments, occAnalApp was doing redundant work. - - - - - 951e5ed9 by Simon Peyton Jones at 2025-11-25T15:33:54+00:00 Fix a performance hole in the occurrence analyser As #26425 showed, the clever stuff in Note [Occurrence analysis for join points] does a lot of duplication of usage details. This patch improved matters with a little fancy footwork. It is described in the new (W4) of the same Note. Compile-time allocations go down slightly. Here are the changes of +/- 0.5% or more: T13253(normal) 329,369,244 326,395,544 -0.9% T13253-spj(normal) 66,410,496 66,095,864 -0.5% T15630(normal) 129,797,200 128,663,136 -0.9% T15630a(normal) 129,212,408 128,027,560 -0.9% T16577(normal) 6,756,706,896 6,723,028,512 -0.5% T18282(normal) 128,462,070 125,808,584 -2.1% GOOD T18698a(normal) 208,418,305 202,037,336 -3.1% GOOD T18730(optasm) 136,981,756 136,208,136 -0.6% T18923(normal) 58,103,088 57,745,840 -0.6% T19695(normal) 1,386,306,272 1,365,609,416 -1.5% T26425(normal) 3,344,402,957 2,457,811,664 -26.5% GOOD T6048(optasm) 79,763,816 79,212,760 -0.7% T9020(optasm) 225,278,408 223,682,440 -0.7% T9961(normal) 303,810,717 300,729,168 -1.0% GOOD geo. mean -0.5% minimum -26.5% maximum +0.4% Metric Decrease: T18282 T18698a T26425 T9961 - - - - - f1959dfc by Simon Peyton Jones at 2025-11-26T11:58:07+00:00 Remove a quadratic-cost assertion check in mkCoreApp See the new Note [Assertion checking in mkCoreApp] - - - - - 98fa0d36 by Simon Hengel at 2025-11-27T17:54:57-05:00 Fix typo in docs/users_guide/exts/type_families.rst - - - - - 5b97e5ce by Simon Hengel at 2025-11-27T17:55:37-05:00 Fix broken RankNTypes example in user's guide - - - - - fa2aaa00 by Simon Peyton Jones at 2025-11-27T17:56:18-05:00 Switch off specialisation in ExactPrint In !15057 (where we re-introduced -fpolymoprhic-specialisation) we found that ExactPrint's compile time blew up by a factor of 5. It turned out to be caused by bazillions of specialisations of `markAnnotated`. Since ExactPrint isn't perf-critical, it does not seem worth taking the performance hit, so this patch switches off specialisation in this one module. - - - - - 1fd25987 by Simon Peyton Jones at 2025-11-27T17:56:18-05:00 Switch -fpolymorphic-specialisation on by default This patch addresses #23559. Now that !10479 has landed and #26329 is fixed, we can switch on polymorphic specialisation by default, addressing a bunch of other tickets listed in #23559. Metric changes: * CoOpt_Singleton: +4% compiler allocations: we just get more specialisations * info_table_map_perf: -20% decrease in compiler allocations. This is caused by using -fno-specialise in ExactPrint.hs Without that change we get a 4x blow-up in compile time; see !15058 for details Metric Decrease: info_table_map_perf Metric Increase: CoOpt_Singletons - - - - - b7fe7445 by Matthew Pickering at 2025-11-27T17:56:59-05:00 rts: Fix a deadlock with eventlog flush interval and RTS shutdown The ghc_ticker thread attempts to flush at the eventlog tick interval, this requires waiting to take all capabilities. At the same time, the main thread is shutting down, the schedule is stopped and then we wait for the ticker thread to finish. Therefore we are deadlocked. The solution is to use `newBoundTask/exitMyTask`, so that flushing can cooperate with the scheduler shutdown. Fixes #26573 - - - - - 1d4a1229 by sheaf at 2025-11-27T17:58:02-05:00 SimpleOpt: don't subst in pushCoercionIntoLambda It was noticed in #26589 that the change in 15b311be was incorrect: the simple optimiser carries two different substitution-like pieces of information: 'soe_subst' (from InVar to OutExpr) and 'soe_inl' (from InId to InExpr). It is thus incorrect to have 'pushCoercionIntoLambda' apply the substitution from 'soe_subst' while discarding 'soe_inl' entirely, which is what was done in 15b311be. Instead, we change back pushCoercionIntoLambda to take an InScopeSet, and optimise the lambda before calling 'pushCoercionIntoLambda' to avoid mixing InExpr with OutExpr, or mixing two InExpr with different environments. We can then call 'soeZapSubst' without problems. Fixes #26588 #26589 - - - - - 84a087d5 by Sylvain Henry at 2025-11-28T17:35:28-05:00 Fix PIC jump tables on Windows (#24016) Avoid overflows in jump tables by using a base label closer to the jump targets. See added Note [Jump tables] - - - - - 82db7042 by Zubin Duggal at 2025-11-28T17:36:10-05:00 rts/linker/PEi386: Copy strings before they are inserted into LoadedDllCache. The original strings are temporary and might be freed at an arbitrary point. Fixes #26613 - - - - - ff3f0d09 by Ben Gamari at 2025-11-29T18:34:28-05:00 gitlab-ci: Run ghcup-metadata jobs on OpenCape runners This significantly reduces our egress traffic and makes the jobs significantly faster. - - - - - ef0dc33b by Matthew Pickering at 2025-11-29T18:35:10-05:00 Use 'OsPath' in getModificationTimeIfExists This part of the compiler is quite hot during recompilation checking in particular since the filepaths will be translated to a string. It is better to use the 'OsPath' native function, which turns out to be easy to do. - - - - - fa3bd0a6 by Georgios Karachalias at 2025-11-29T18:36:05-05:00 Use OsPath in PkgDbRef and UnitDatabase, not FilePath - - - - - 0d7c05ec by Ben Gamari at 2025-12-01T03:13:46-05:00 hadrian: Place user options after package arguments This makes it easier for the user to override the default package arguments with `UserSettings.hs`. Fixes #25821. ------------------------- Metric Decrease: T14697 ------------------------- - - - - - 3b2c4598 by Vladislav Zavialov at 2025-12-01T03:14:29-05:00 Namespace-specified wildcards in import/export lists (#25901) This change adds support for top-level namespace-specified wildcards `type ..` and `data ..` to import and export lists. Examples: import M (type ..) -- imports all type and class constructors from M import M (data ..) -- imports all data constructors and terms from M module M (type .., f) where -- exports all type and class constructors defined in M, -- plus the function 'f' The primary intended usage of this feature is in combination with module aliases, allowing namespace disambiguation: import Data.Proxy as T (type ..) -- T.Proxy is unambiguously the type constructor import Data.Proxy as D (data ..) -- D.Proxy is unambiguously the data constructor The patch accounts for the interactions of wildcards with: * Imports with `hiding` clauses * Import warnings -Wunused-imports, -Wdodgy-imports * Export warnings -Wduplicate-exports, -Wdodgy-exports Summary of the changes: 1. Move the NamespaceSpecifier type from GHC.Hs.Binds to GHC.Hs.Basic, making it possible to use it in more places in the AST. 2. Extend the AST (type: IE) with a representation of `..`, `type ..`, and `data ..` (constructor: IEWholeNamespace). Per the proposal, the plain `..` is always rejected with a dedicated error message. 3. Extend the grammar in Parser.y with productions for `..`, `type ..`, and `data ..` in both import and export lists. 4. Implement wildcard imports by updating the `filterImports` function in GHC.Rename.Names; the logic for IEWholeNamespace is roughly modeled after the Nothing (no explicit import list) case. 5. Implement wildcard exports by updating the `exports_from_avail` function in GHC.Tc.Gen.Export; the logic for IEWholeNamespace is closely modeled after the IEModuleContents case. 6. Refactor and extend diagnostics to report the new warnings and errors. See PsErrPlainWildcardImport, DodgyImportsWildcard, PsErrPlainWildcardExport, DodgyExportsWildcard, TcRnDupeWildcardExport. Note that this patch is specifically about top-level import/export items. Subordinate import/export items are left unchanged. - - - - - c71faa76 by Luite Stegeman at 2025-12-01T03:16:05-05:00 rts: Handle overflow of ELF section header string table If the section header string table is stored in a section greater than or equal to SHN_LORESERVE (0xff00), the 16-bit field e_shstrndx in the ELF header does not contain the section number, but rather an overflow value SHN_XINDEX (0xffff) indicating that we need to look elsewhere. This fixes the linker by not using e_shstrndx directly but calling elf_shstrndx, which correctly handles the SHN_XINDEX value. Fixes #26603 - - - - - ab20eb54 by Mike Pilgrem at 2025-12-01T22:46:55+00:00 Re CLC issue 292 Warn GHC.Internal.List.{init,last} are partial Also corrects the warning for `tail` to refer to `Data.List.uncons` (like the existing warning for `head`). In module `Settings.Warnings`, applies `-Wno-x-partial` to the `filepath`, and `parsec` packages (outside GHC's repository). Also bumps submodules. - - - - - fc1d7f79 by Jade Lovelace at 2025-12-02T11:04:09-05:00 docs: fix StandaloneKindSignatures in DataKinds docs These should be `type` as otherwise GHC reports a duplicate definition error. - - - - - beae879b by Rodrigo Mesquita at 2025-12-03T15:42:37+01:00 task: Substitute some datatypes for newtypes * Substitutes some data type declarations for newtype declarations * Adds comment to `LlvmConfigCache`, which must decidedly not be a newtype. Fixes #23555 - - - - - 3bd7dd44 by mangoiv at 2025-12-04T04:36:45-05:00 Renamer: reinstate the template haskell level check in notFound Out-of-scope names might be caused by a staging error, as is explained by Note [Out of scope might be a staging error] in GHC.Tc.Utils.Env.hs. This logic was assumed to be dead code after 217caad1 and has thus been removed. This commit reintroduces it and thus fixes issue #26099. - - - - - 0318010b by Zubin Duggal at 2025-12-04T04:37:27-05:00 testlib: Optionally include the way name in the expected output file This allows us to have different outputs for different ways. - - - - - 6d945fdd by Zubin Duggal at 2025-12-04T04:37:27-05:00 testsuite: Accept output of tests failing in ext-interp way due to differing compilation requirements Fixes #26552 - - - - - 0ffc5243 by Cheng Shao at 2025-12-04T04:38:09-05:00 devx: minor fixes for compile_flags.txt This patch includes minor fixes for compile_flags.txt to improve developer experience when using clangd as language server to hack on RTS C sources: - Ensure `-fPIC` is passed and `__PIC__` is defined, to be coherent with `-DDYNAMIC` and ensure the `__PIC__` guarded code paths are indexed - Add the missing `-DRtsWay` definition, otherwise a few source files like `RtsUtils.c` and `Trace.c` would produce clangd errors - - - - - a7213a20 by Matthew Pickering at 2025-12-05T02:26:03+01:00 hadrian: Use a response file to invoke GHC for dep gathering. In some cases we construct an argument list too long for GHC to handle directly on windows. This happens when we generate the dependency file because the command line will contain references to a large number of .hs files. To avoid this we now invoke GHC using a response file when generating dependencies to sidestep length limitations. Note that we only pass the actual file names in the dependency file. Why? Because this side-steps #26560 - - - - - 400 changed files: - .gitlab-ci.yml - .gitlab/rel_eng/upload_ghc_libs.py - compile_flags.txt - compiler/GHC.hs - compiler/GHC/Builtin/Types.hs - compiler/GHC/Builtin/Types/Literals.hs - compiler/GHC/Builtin/Types/Prim.hs - compiler/GHC/Cmm/Sink.hs - compiler/GHC/CmmToAsm/AArch64/CodeGen.hs - compiler/GHC/CmmToAsm/AArch64/RegInfo.hs - compiler/GHC/CmmToAsm/PPC/RegInfo.hs - compiler/GHC/CmmToAsm/Reg/Linear.hs - compiler/GHC/CmmToAsm/Reg/Liveness.hs - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToAsm/X86/Instr.hs - compiler/GHC/CmmToAsm/X86/Ppr.hs - compiler/GHC/Core.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/Coercion/Opt.hs - compiler/GHC/Core/DataCon.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Map/Type.hs - compiler/GHC/Core/Multiplicity.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Core/RoughMap.hs - compiler/GHC/Core/SimpleOpt.hs - 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compiler/GHC/Types/Hint.hs - compiler/GHC/Types/Hint/Ppr.hs - compiler/GHC/Types/Id/Make.hs - compiler/GHC/Types/SourceText.hs - compiler/GHC/Types/Unique/FM.hs - compiler/GHC/Types/Unique/Set.hs - compiler/GHC/Types/Var/Env.hs - compiler/GHC/Unit/Finder.hs - compiler/GHC/Unit/State.hs - compiler/GHC/Utils/Misc.hs - compiler/GHC/Utils/Outputable.hs - compiler/Language/Haskell/Syntax/Extension.hs - compiler/Language/Haskell/Syntax/ImpExp.hs - compiler/ghc.cabal.in - docs/users_guide/9.16.1-notes.rst - docs/users_guide/bugs.rst - docs/users_guide/debug-info.rst - docs/users_guide/debugging.rst - docs/users_guide/extending_ghc.rst - docs/users_guide/exts/arrows.rst - docs/users_guide/exts/data_kinds.rst - docs/users_guide/exts/derive_any_class.rst - docs/users_guide/exts/deriving_extra.rst - docs/users_guide/exts/deriving_inferred.rst - docs/users_guide/exts/deriving_strategies.rst - docs/users_guide/exts/explicit_namespaces.rst - docs/users_guide/exts/gadt.rst - docs/users_guide/exts/generics.rst - 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