Simon Jakobi pushed to branch wip/sjakobi/shallow-submodules at Glasgow Haskell Compiler / GHC

Commits:

• 94d8f83b
  by Cheng Shao at 2026-07-22T11:30:40-04:00

  hadrian: clean up stale cabal package flags in the tree
  
  This patch cleans up stale cabal package flags in the tree and related
  hadrian/autoconf logic. Closes #27474.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 0bf1d8c9
  by Sasha Bogicevic at 2026-07-22T11:31:21-04:00

  parser: don't suggest ImportQualifiedPost when it is already enabled
  
  -Wprepositive-qualified-module unconditionally attached a hint to
  enable ImportQualifiedPost, even when the extension was already on
  (as it is by default under GHC2021). Record the extension's state in
  the PsWarnImportPreQualified diagnostic and drop the hint when it is
  already enabled.
  
  Fixes #27380
  

• 700a1dd1
  by Simon Jakobi at 2026-07-23T11:21:20-04:00

  ci: Reduce lint job setup costs
  
  Avoid fetching unnecessary history and submodules for lightweight lint
  jobs. Run changelog validation without Hadrian.
  
  Because the lint-author job is now based on the .lint template directly,
  we enhance it to allow Git to read from the runner-owned checkouts,
  In the previously used .lint-params template, this permissions issue was
  addressed via `chown`.
  
  Closes #27521.
  
  Assisted-by: gpt-5.6-sol via Codex CLI
  

• 26a44fb0
  by ARATA Mizuki at 2026-07-23T11:22:10-04:00

  testsuite: Fix memory issues of doublex2_* and simd010
  
  doublex2_* had reads from uninitialized memory.
  
  simd010 had out-of-bounds array access.
  
  Fixes #27544
  

• c639a6cc
  by Simon Jakobi at 2026-07-23T17:26:03+02:00

  ci: Use shallow submodule clones by default
  
  Limit submodule clones to depth one to reduce CI checkout costs. Keep
  fetching full submodule history for the submodule lint jobs, which
  inspect commits across a range.
  
  Assisted-by: gpt-5.6-sol via Codex CLI
  

27 changed files:

• .gitlab-ci.yml
• .gitlab/ci.sh
• + changelog.d/27380
• compiler/GHC/Parser/Errors/Ppr.hs
• compiler/GHC/Parser/Errors/Types.hs
• compiler/GHC/Parser/PostProcess.hs
• configure.ac
• distrib/configure.ac.in
• hadrian/cfg/system.config.host.in
• hadrian/cfg/system.config.target.in
• hadrian/src/Oracles/Flag.hs
• hadrian/src/Rules/Generate.hs
• hadrian/src/Rules/Test.hs
• hadrian/src/Settings/Packages.hs
• m4/fp_check_pthreads.m4
• rts/rts.cabal
• + testsuite/tests/module/T27380.hs
• + testsuite/tests/module/T27380.stderr
• testsuite/tests/module/all.T
• testsuite/tests/module/mod184.stderr
• testsuite/tests/simd/should_run/doublex2_arith.hs
• testsuite/tests/simd/should_run/doublex2_arith.stdout
• testsuite/tests/simd/should_run/doublex2_arith_baseline.hs
• testsuite/tests/simd/should_run/doublex2_arith_baseline.stdout
• testsuite/tests/simd/should_run/doublex2_fma.hs
• testsuite/tests/simd/should_run/doublex2_fma.stdout
• testsuite/tests/simd/should_run/simd010.hs

The diff was not included because it is too large.