Sven Tennie pushed to branch wip/supersven/refactor-system-cxx-std-lib-hadrian-rules at Glasgow Haskell Compiler / GHC Commits: 63ce5770 by Luite Stegeman at 2026-05-28T12:23:35-04:00 Fixes for black holes - suspend duplicate work for eager black holes - detect eager black holes in checkBlockingQueues - don't overwrite existing black holes even if they're not in an eager blackhole frame - don't deadlock on self when thunk is already blackholed Fixes #26936 - - - - - 037a80dc by Tom McLaughlin at 2026-05-28T12:24:36-04:00 Event/Windows.hsc: rethrow exceptions in overlapped IO This prevents the WinIO manager from swallowing exceptions in overlapped IO. It was added to make WinIO support possible in the `network` library. See https://gitlab.haskell.org/ghc/ghc/-/issues/27283. We also bump __IO_MANAGER_WINIO__ to 2 so libraries can gate on this using CPP. - - - - - 2d53bcdb by Wolfgang Jeltsch at 2026-05-28T12:25:21-04:00 Allow `downsweep` to use nodes of an existing module graph To this end, `downsweep` has not been able to use the nodes of a module graph obtained from a previous downsweeping round. In some GHC API applications, downsweeping is performed somewhat incrementally and therefore could profit from reusing such existing results. This contribution makes this possible. Resolves #27054. Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com> - - - - - f4fbb583 by Simon Jakobi at 2026-05-28T12:26:04-04:00 Add regression test for T11226 Closes #11226. - - - - - ed29a5e6 by Sven Tennie at 2026-05-28T17:30:36-04:00 Add optional config setting for LibDir (#19174) Previously, the `libDir` was derived from `topDir`. This won't work for inplace stage2 cross-compilers where binaries and libraries are in different stage dirs (`_build/stage1/` for executables and `_build/stage2` for libraries). `LibDir` is set in the inplace `settings` files. For bindists, we generate a new `settings` file with no `LibDir` entry. GHC then defaults to use `topDir` as `libDir` again. This keeps the bindist relocatable. If `LibDir` is a relative path, it is interpreted relatively to `topDir`. The global package db is part of the `lib/` folder. If we want to point for inplace cross-compilers to the succeeding stage's folder, this is done by setting `LibDir`. Thus, the global package db must be found relative to `libDir`` (which may default to `topDir` or be set by `LibDir`). The complexity of settings becomes scary. So, add a test to ensure `LibDir` works as expected. - - - - - 8339cf8f by Sven Tennie at 2026-05-28T17:30:36-04:00 Add Haddock to FileSettings Helping to understand the fields' meanings without deeper analyses. - - - - - 4ce251e4 by Sylvain Henry at 2026-05-28T17:31:39-04:00 foundation test: skip signed minBound `quot` (-1) (#27222) `minBound `quot` (-1)` for fixed-width signed integers is platform dependent: the mathematical result -minBound is not representable in the type. On x86, IDIV traps; LLVM's sdiv is undefined behaviour in this case; on AArch64/RISC-V, SDIV wraps to minBound. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> - - - - - b8ba7e61 by Simon Jakobi at 2026-05-28T17:32:23-04:00 Prevent dictionary-passing in checkTyEqRhs ...by pre-specializing it to TcM. Previously, wherever checkTyEqRhs was used in other modules, the Core showed dictionary passing ($fMonadIOEnv). The added SPECIALIZE pragma prevents this. - - - - - d603477f by David Eichmann at 2026-05-29T13:17:12-04:00 Hadrian: create a ghc-internal .def file per ghc-internal dll The .def file generated from rts/win32/libHSghc-internal.def.in contains the name of the ghc-internal dll. The correct dll name differs based on if the dll is inplace/final and if using the Dynamic way. Previously, this was not accounted for and inconsistent dlls names where used. That led to failure when loading dlls at runtime in experiments with windows dynamic linking. - - - - - 1fc21753 by Sylvain Henry at 2026-05-29T13:18:14-04:00 ghc-bignum: copy backend interface haddocks to Native backend (#27305) The haddock comments documenting the BigNat backend interface (function contracts, expected MutableWordArray# sizes, return-value semantics, etc.) were attached to the FFI backend module. Copy them to the Native backend so they remain in tree once the FFI backend is removed. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> - - - - - 717059df by Sylvain Henry at 2026-05-29T13:18:14-04:00 ghc-bignum: remove FFI backend (#27305) The FFI backend of ghc-bignum (now part of ghc-internal) had no known users and is easy to recreate by relinking ghc-internal with a custom backend. Remove the backend module, the bignum-ffi cabal flag, and the ffi option from Hadrian's --bignum selector. The backend interface documentation now lives in the Native backend module. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> - - - - - 4bb3b1d8 by Sylvain Henry at 2026-05-29T13:18:14-04:00 ghc-bignum: remove Check backend (#27305) The Check backend of ghc-bignum (now part of ghc-internal) compared the selected backend's output against the Native backend for validation. It had no known users. Remove the backend module, the bignum-check cabal flag, the bignumCheck Hadrian flavour field, and the check- prefix in Hadrian's --bignum selector. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> - - - - - ed07c7be by Matthew Pickering at 2026-05-30T09:04:21+02:00 hadrian: Refactor system-cxx-std-lib rules I noticed a few things wrong with the hadrian rules for `system-cxx-std-lib` rules. * For `text` there is an ad-hoc check to depend on `system-cxx-std-lib` outside of `configurePackage`. * The `system-cxx-std-lib` dependency is not read from cabal files. * Recache is not called on the packge database after the `.conf` file is generated, a more natural place for this rule is `registerRules`. Treating this uniformly like other packages is complicated by it not having any source code or a cabal file. However we can do a bit better by reporting the dependency firstly in `PackageData` and then needing the `.conf` file in the same place as every other package in `configurePackage`. This commit increases the `shakeVersion`, to provide backwards compatibility to previous builds with different PackageData. Fixes #25303 Co-authored-by: Sven Tennie <sven.tennie@gmail.com> - - - - - 69 changed files: - + changelog.d/fix-blackhole-handling - + changelog.d/hadrian-system-cxx-std-lib-25303 - + changelog.d/libdir-setting - + changelog.d/module-graph-reuse-in-downsweep - + changelog.d/remove-bignum-check-backend - + changelog.d/remove-bignum-ffi-backend - + changelog.d/windows-rethrow-overlapped-exception - compiler/GHC/Driver/Config/Interpreter.hs - compiler/GHC/Driver/Downsweep.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Make.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Settings.hs - compiler/GHC/Settings/IO.hs - compiler/GHC/SysTools/Cpp.hs - compiler/GHC/Tc/Utils/Unify.hs - hadrian/README.md - hadrian/doc/user-settings.md - hadrian/src/CommandLine.hs - hadrian/src/Flavour/Type.hs - hadrian/src/Hadrian/Haskell/Cabal/Parse.hs - hadrian/src/Hadrian/Haskell/Cabal/Type.hs - hadrian/src/Main.hs - hadrian/src/Rules/BinaryDist.hs - hadrian/src/Rules/Generate.hs - hadrian/src/Rules/Library.hs - hadrian/src/Rules/Register.hs - hadrian/src/Rules/Rts.hs - hadrian/src/Settings.hs - hadrian/src/Settings/Builders/RunTest.hs - hadrian/src/Settings/Default.hs - hadrian/src/Settings/Packages.hs - libraries/ghc-bignum/ghc-bignum.cabal - libraries/ghc-boot/GHC/Settings/Utils.hs - libraries/ghc-internal/bignum-backend.rst - libraries/ghc-internal/ghc-internal.cabal.in - libraries/ghc-internal/src/GHC/Internal/Bignum/Backend.hs - − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Check.hs - − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/FFI.hs - libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Native.hs - − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Selected.hs - libraries/ghc-internal/src/GHC/Internal/Event/Windows.hsc - rts/Messages.c - rts/ThreadPaused.c - rts/Threads.c - rts/Updates.h - rts/include/rts/storage/ClosureMacros.h - rts/win32/libHSghc-internal.def.in - testsuite/tests/MiniQuickCheck.hs - + testsuite/tests/ghc-api/downsweep/IncrementalDownsweep.hs - + testsuite/tests/ghc-api/downsweep/IncrementalDownsweep.modules/A.hs - + testsuite/tests/ghc-api/downsweep/IncrementalDownsweep.modules/B.hs - + testsuite/tests/ghc-api/downsweep/IncrementalDownsweep.modules/C.hs - + testsuite/tests/ghc-api/downsweep/IncrementalDownsweep.modules/D.hs - + testsuite/tests/ghc-api/downsweep/IncrementalDownsweep.modules/X.hs - + testsuite/tests/ghc-api/downsweep/IncrementalDownsweep.modules/Y.hs - + testsuite/tests/ghc-api/downsweep/IncrementalDownsweep.modules/Z.hs - + testsuite/tests/ghc-api/downsweep/IncrementalDownsweep.stdout - testsuite/tests/ghc-api/downsweep/OldModLocation.hs - testsuite/tests/ghc-api/downsweep/PartialDownsweep.hs - testsuite/tests/ghc-api/downsweep/all.T - testsuite/tests/ghc-api/fixed-nodes/InterfaceModuleGraph.hs - + testsuite/tests/ghc-api/settings/LibDir.hs - + testsuite/tests/ghc-api/settings/LibDir.stdout - + testsuite/tests/ghc-api/settings/all.T - testsuite/tests/numeric/should_run/foundation.hs - + testsuite/tests/perf/should_run/T11226.hs - + testsuite/tests/perf/should_run/T11226.stdout - testsuite/tests/perf/should_run/all.T The diff was not included because it is too large. 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