Cheng Shao pushed to branch wip/fix-msys2-sysroot-leak at Glasgow Haskell Compiler / GHC

Commits:

• 44cf9cd7
  by Wolfgang Jeltsch at 2026-05-12T09:48:18-04:00

  Move the `Text.Read` implementation into `base`
  

• 4ac3f7d6
  by Vladislav Zavialov at 2026-05-12T09:49:03-04:00

  EPA: Use AnnParen for tuples and sums
  
  Summary of changes
  
  * Do not use AnnParen in XListTy, replace it with EpToken "[" and "]"
  * Specialise AnnParen to tuple/sums by dropping the AnnParensSquare
    and keeping only AnnParens and AnnParensHash
  * Use AnnParen in XExplicitTuple
  * Use AnnParen in XExplicitTupleTy
  * Use AnnParen in XTuplePat
  * Use AnnParen in XExplicitSum (via AnnExplicitSum)
  * Use AnnParen in XSumPat (via EpAnnSumPat)
  
  This is a refactoring with no user-facing changes.
  

• 1bdcddec
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Add minimal dlltool support to ghc-toolchain
  
  The dlltool is a tool that can create dll import libraries from .def
  files. These .def files list the exported symbols of dlls. Its somewhat
  like gnu linker scripts, but more limited.
  
  We will need dlltool to build the rts and ghc-internal libraries as DLLs
  on Windows. The rts and ghc-internal libraries have a recursive
  dependency on each other. Import libraries can be used to resolve
  recursive dependencies between dlls. We will use an import library for
  the rts when linking the ghc-internal library.
  

• f7fc3770
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Add minimal dlltool support into ./configure
  
  Find dlltool, and hopefully support finding it within the bundled llvm
  toolchain on windows.
  

• e4e22bfb
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Update the default host and target files for dlltool support
  

• 5666c8f9
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Add dlltool as a hadrian builder
  
  Optional except on windows.
  

• 5e14fe3f
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Update and generate libHSghc-internal.def from .def.in file
  
  The only symbol that the rts imports from the ghc-internal package now
  is init_ghc_hs_iface. So the rts only needs an import lib that defines
  that one symbol.
  
  Also, remove the libHSghc-prim.def because it is redundant. The rts no
  longer imports anything from ghc-prim.
  
  Keep libHSffi.def for now. We may yet need it once it is clear how
  libffi is going to be built/used for ghc.
  

• 3d91e4a6
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Add rule to build libHSghc-internal.dll.a and link into the rts
  
  On windows only, with dynamic linking.
  
  This is needed because on windows, all symbols in dlls must be resolved.
  No dangling symbols allowed. References to external symbols must be
  explicit. We resolve this with an import library. We create an import
  library for ghc-internal, a .dll.a file. This is a static archive
  containing .o files that define the symbols we need, and crucially have
  ".idata" sections that specifies the symbols the dll imports and from
  where.
  
  Note that we do not install this libHSghc-internal.dll.a, and it does
  not need to list all the symbols exported by that package. We create a
  special purpose import lib and only use it when linking the rts dll, so
  it only has to list the symbols that the rts uses from ghc-internal
  (which is exactly one symbol: init_ghc_hs_iface).
  

• c8dae539
  by Alice Rixte at 2026-05-12T09:50:52-04:00

  Script for downloading and copying `base-exports` file
  

• 4392aa20
  by Cheng Shao at 2026-05-12T14:56:41+00:00

  testsuite: mark T22159 as fragile
  
  This patch marks T22159 as fragile on Windows for issue described in #27248.
  Before we get to the bottom of those failures, this unblocks newer
  Windows runners.
  

44 changed files:

• + changelog.d/ghc-api-epa-parens
• compiler/GHC/Hs/Dump.hs
• compiler/GHC/Hs/Expr.hs
• compiler/GHC/Hs/Pat.hs
• compiler/GHC/Hs/Type.hs
• compiler/GHC/Parser.y
• compiler/GHC/Parser/Annotation.hs
• compiler/GHC/Parser/PostProcess.hs
• configure.ac
• distrib/configure.ac.in
• hadrian/cfg/default.host.target.in
• hadrian/cfg/default.target.in
• hadrian/src/Builder.hs
• hadrian/src/Rules/Generate.hs
• hadrian/src/Rules/Library.hs
• hadrian/src/Rules/Rts.hs
• libraries/base/src/Data/Functor/Classes.hs
• libraries/base/src/Data/Functor/Compose.hs
• libraries/base/src/Prelude.hs
• libraries/base/src/Text/Read.hs
• libraries/ghc-internal/ghc-internal.cabal.in
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding.hs
• − libraries/ghc-internal/src/GHC/Internal/Text/Read.hs
• m4/find_llvm_prog.m4
• m4/fp_setup_windows_toolchain.m4
• m4/ghc_toolchain.m4
• m4/prep_target_file.m4
• rts/.gitignore
• + rts/win32/libHSghc-internal.def.in
• testsuite/tests/ffi/should_run/all.T
• testsuite/tests/ghc-api/T25121_status.stdout
• + testsuite/tests/interface-stability/.gitignore
• testsuite/tests/interface-stability/README.mkd
• + testsuite/tests/interface-stability/download-base-exports.sh
• testsuite/tests/parser/should_compile/DumpParsedAst.stderr
• testsuite/tests/parser/should_compile/DumpRenamedAst.stderr
• testsuite/tests/parser/should_compile/KindSigs.stderr
• testsuite/tests/parser/should_compile/T20452.stderr
• testsuite/tests/th/T24111.stdout
• testsuite/tests/typecheck/should_compile/subsumption_sort_hole_fits.stderr
• testsuite/tests/typecheck/should_fail/T21130.stderr
• utils/check-exact/ExactPrint.hs
• utils/ghc-toolchain/exe/Main.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Target.hs

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