configure: WARNING:
There are some differences between the toolchain configured by "configure" (default.target) and the toolchain configured by the "ghc-toolchain" program (default.target.ghc-toolchain).
16c16
< , tgtCxxCompiler = Cxx {cxxProgram = Program { prgPath = "g++" , prgFlags = [] }}
---
> , tgtCxxCompiler = Cxx {cxxProgram = Program { prgPath = "g++" , prgFlags = ["--target=arm64-apple-darwin"] }}
Don't worry! This won't affect your ghc in any way.
However, in a near future, we will move to configuring toolchains with "ghc-toolchain" by default, so you might have discovered a future bug.
In light of it, if you've spotted this difference, please report a GHC bug at https://www.haskell.org/ghc/reportabug
Dear GHC users, distributors and devs,
I'm pleased to announce that the second release candidate for GHC 9.12.5
is now available from downloads.haskell.org and on GHCup.
GHC 9.12.5 is a bug fix release. For a long form announcement, check out
https://discourse.haskell.org/t/ghc-9-12-5-rc2-is-now-available/14313/1.
Mind that the very important overhaul of the semaphore-compat library to
v2 is included in this release and that the semaphore feature will only
start working with cabal-install 3.18 again, which is sadly a breaking
but necessary change.
Your testing of the release is much appreciated. Many thanks to the
nixpkgs and stackage package set distributors for testing the first
release candidate.
If you find any issues with the candidate, please open an issue on the
ghc issue tracker.
If there are no critical regressions are discovered within this release
candidate, it will be published in about 2 weeks of time (the week of 8
July 2026).
Best
Magnus
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