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65d4b8e4
by sheaf at 2026-02-17T18:04:37+05:30
Use tcMkScaledFunTys in matchExpectedFunTys
We should use tcMkScaledFunTys rather than mkScaledFunTys in
GHC.Tc.Utils.Unify.matchExpectedFunTys, as the latter crashes
when the kind of the result type is a bare metavariable.
We know the result is always Type-like, so we don't need scaledFunTys
to try to rediscover that from the kind.
Fixes #26277
(cherry picked from commit 624afa4a65caa8ec23f85e70574dfb606f90c173)
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ffa32138
by sheaf at 2026-02-17T18:04:37+05:30
Improve Notes about disambiguating record updates
This commit updates the notes [Disambiguating record updates] and
[Type-directed record disambiguation], in particular adding more
information about the deprecation status of type-directed disambiguation
of record updates.
(cherry picked from commit a2d9d7c2073867ee0cabb8d49f93246d95ec0b09)
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9493fd96
by sheaf at 2026-02-17T18:04:37+05:30
Add test for #26216
(cherry picked from commit 2e73f3426ab6e3cf1938b53831005593f3fd351c)
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3f575881
by Vladislav Zavialov at 2026-02-17T18:04:37+05:30
Fix PREP_MAYBE_LIBRARY in prep_target_file.m4
This change fixes a configure error introduced in:
commit 8235dd8c4945db9cb03e3be3c388d729d576ed1e
ghc-toolchain: Move UseLibdw to per-Target file
Now the build no longer fails with:
acghc-toolchain: Failed to read a valid Target value from hadrian/cfg/default.target
(cherry picked from commit 1480872af6b80db1b035a44409188416df041048)
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27ef06e5
by Cheng Shao at 2026-02-17T18:04:37+05:30
rts: remove obsolete CC_SUPPORTS_TLS logic
This patch removes obsolete CC_SUPPORTS_TLS logic throughout the rts,
given __thread is now uniformly supported by C toolchains of all
platforms we currently support.
(cherry picked from commit 0f034942724233e1457549123b46880f7b93e805)
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28fbd4f9
by Cheng Shao at 2026-02-17T18:04:37+05:30
rts: remove obsolete HAS_VISIBILITY_HIDDEN logic
This patch removes obsolete HAS_VISIBILITY_HIDDEN logic throughout the
rts, given __attribute__((visibility("hidden"))) is uniformly
supported by C toolchains of all platforms we currently support.
(cherry picked from commit ef7056554df5603ec4d1e33193abe953970e6ab3)
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cfaa5904
by Cheng Shao at 2026-02-17T18:04:37+05:30
rts: remove -O3 pragma hack in Hash.c
This patch removes an obsolete gcc pragma to specify -O3 in Hash.c.
Hadrian already passes the right flag.
(cherry picked from commit 9fdc1f7d855cc61f90de909875f6ae0d6798dca7)
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6e1fd477
by Cheng Shao at 2026-02-17T18:04:37+05:30
wasm: fix dyld handling for forward declared GOT.func items
This patch fixes wasm shared linker's handling of forward declared
GOT.func items, see linked issue for details. Also adds T26430 test to
witness the fix. Fixes #26430.
Co-authored-by: Codex <codex@openai.com>
(cherry picked from commit 867c26755e8855c6df949e65df0c2aebc9da64c3)
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a3e53502
by Cheng Shao at 2026-02-17T18:04:37+05:30
rts: remove obsolete __GNUC__ related logic
This patch removes obsolete `__GNUC__` related logic, given on any
currently supported platform and toolchain, `__GNUC__ >= 4` is
universally true. Also pulls some other weeds and most notably, use
`__builtin___clear_cache` for clang as well, since clang has supported
this gcc intrinsic since 2014, see
https://github.com/llvm/llvm-project/commit/c491a8d4577052bc6b3b4c72a7db6a7cfcbc2ed0.
(cherry picked from commit 67de53a6ced23caad640d2c7421089242f0dfb76)
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466675a2
by Cheng Shao at 2026-02-17T18:04:37+05:30
hadrian: fix GHC.Platform.Host generation for cross stage1
This patch fixes incorrectly GHC.Platform.Host generation logic for
cross stage1 in hadrian (#26449). Also adds T26449 test case to
witness the fix.
Co-authored-by: Codex <codex@openai.com>
(cherry picked from commit 8cbe006ad09d5a64e4a3cdf4c91a8b81ff1511be)
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8954d56f
by Luite Stegeman at 2026-02-17T18:04:37+05:30
rts: Fix lost wakeups in threadPaused for threads blocked on black holes
The lazy blackholing code in threadPaused could overwrite closures
that were already eagerly blackholed, and as such wouldn't have a
marked update frame. If the black hole was overwritten by its
original owner, this would lead to an undetected collision, and
the contents of any existing blocking queue being lost.
This adds a check for eagerly blackholed closures and avoids
overwriting their contents.
Fixes #26324
(cherry picked from commit a1de535f762bc23d4cf23a5b1853591dda12cdc9)
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44bb797e
by Luite Stegeman at 2026-02-17T18:04:37+05:30
rts: push the correct update frame in stg_AP_STACK
The frame contains an eager black hole (__stg_EAGER_BLACKHOLE_info) so
we should push an stg_bh_upd_frame_info instead of an stg_upd_frame_info.
(cherry picked from commit b7e21e498d39e0ee764e3237544b4c39ddf98467)
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3af4f71e
by Cheng Shao at 2026-02-17T18:04:37+05:30
testsuite: remove unused expected output files
This patch removes unused expected output files in the testsuites on
platforms that we no longer support.
(cherry picked from commit 6992ac097b9da989f125f896afe21b75dba8b4c9)
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dac282c5
by Ben Gamari at 2026-02-17T18:04:37+05:30
rts/posix: Enforce iteration limit on heap reservation logic
Previously we could loop indefinitely when attempting to get an address
space reservation for our heap. Limit the logic to 8 iterations to
ensure we instead issue a reasonable error message.
Addresses #26151.
(cherry picked from commit ff1650c96c61af02e193854312a9ccd303968e47)
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7bd9a307
by Ben Gamari at 2026-02-17T18:04:37+05:30
rts/posix: Hold on to low reservations when reserving heap
Previously when the OS gave us an address space reservation in low
memory we would immediately release it and try again. However, on some
platforms this meant that we would get the same allocation again in the
next iteration (since mmap's `hint` argument is just that, a hint).
Instead we now hold on to low reservations until we have found a
suitable heap reservation.
Fixes #26151.
(cherry picked from commit 0184455728f841a699648f879fdb29128081fc6b)
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099deccb
by Julian Ospald at 2026-02-17T18:04:37+05:30
ghc-toolchain: Drop `ld.gold` from merge object command
It's deprecated.
Also see #25716
(cherry picked from commit c58f9a615f05e9d43629f6e846ae22cad2a6163d)
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47aa35e2
by Ben Gamari at 2026-02-17T18:04:37+05:30
gitlab-ci: Make RELEASE_JOB an input
Rather than an undocumented variable.
(cherry picked from commit f9790ca81deb8b14ff2eabf701aecbcfd6501963)
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d64f88be
by Cheng Shao at 2026-02-17T18:04:37+05:30
testsuite: fix T3586 for non-SSE3 platforms
`T3586.hs` contains `-fvia-C -optc-msse3` which I think is a
best-effort basis to harvest the C compiler's auto vectorization
optimizations via the C backend back when the test was added. The
`-fvia-C` part is now a deprecated no-op because GHC can't fall back
to the C backend on a non-unregisterised build, and `-optc-msse3`
might actually cause the test to fail on non x86/x64 platforms, e.g.
recent builds of wasi-sdk would report `wasm32-wasi-clang: error:
unsupported option '-msse3' for target 'wasm32-unknown-wasi'`.
So this patch cleans up this historical cruft. `-fvia-C` is removed,
and `-optc-msse3` is only passed when cpuid contains `pni` (which
indicates support of SSE3).
(cherry picked from commit 70ee825a516bcf7aac762bfedb4a017d35f8dcf3)
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583b8be7
by Julian Ospald at 2026-02-17T18:04:38+05:30
Improve error handling in 'getPackageArchives'
When the library dirs in the package conf files are not set up correctly,
the JS linker will happily ignore such packages and not link against them,
although they're part of the link plan.
Fixes #26383
(cherry picked from commit 91b6be10bd58c2bfc1c7c22e81b06ab3be583228)
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07bf37e3
by Ben Gamari at 2026-02-17T18:04:38+05:30
rts: Annotate BCOs with their Name
This introduces a new bytecode instruction, `BCO_NAME`, to aid in debugging
bytecode execution. This instruction is injected by `mkProtoBCO` and
captures the Haskell name of the BCO. It is then printed by the
disassembler, allowing ready correlation with STG dumps.
(cherry picked from commit 5192a75fe9b272e8b1ef290fa834714c81bd1f79)
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8bd22849
by sheaf at 2026-02-17T18:04:38+05:30
Bad record update msg: allow out-of-scope datacons
This commit ensures that, when we encounter an invalid record update
(because no constructor exists which contains all of the record fields
mentioned in the record update), we graciously handle the situation in
which the constructors themselves are not in scope. In that case,
instead of looking up the constructors in the GlobalRdrEnv, directly
look up their GREInfo using the lookupGREInfo function.
Fixes #26391
(cherry picked from commit cef8938f3c0d22583f01d5ea29e6109bccd36040)
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d82ff48b
by Cheng Shao at 2026-02-17T18:04:38+05:30
rts: remove obsolete COMPILING_WINDOWS_DLL logic
This patch removes obsolete COMPILING_WINDOWS_DLL logic throughout the
rts. They were once used for compiling to win32 DLLs, but we haven't
been able to compile Haskell units to win32 DLLs for many years now,
due to PE format's restriction of no more than 65536 exported symbols
in a single DLL.
(cherry picked from commit b8cfa8f741729ef123569fb321c4b2ab4a1a941c)
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757f33b7
by Julian Ospald at 2026-02-17T18:04:38+05:30
Skip uniques test if sources are not available
(cherry picked from commit 5dc2e9eaf60fd72771bf2e8112aec182665461a1)
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58aefd21
by Julian Ospald at 2026-02-17T18:04:38+05:30
rts: remove unneccesary cabal flags
We perform those checks via proper autoconf macros
instead that do the right thing and then add those
libs to the rts buildinfo.
(cherry picked from commit 643ce801a8b559071683cad0e5adbc26b9fc8385)