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Merged
twitchyliquid64 merged 3 commits into from
Aug 6, 2026
Merged

fix(ghc): reduce build time with parallelism #575

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fix(ghc): reduce build time with parallelism
twitchyliquid64 Aug 6, 2026
9957a87
Merge branch 'main' into tom/ghc
twitchyliquid64 Aug 6, 2026
b0a088c
Merge branch 'main' into tom/ghc
twitchyliquid64 Aug 6, 2026
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14 changes: 12 additions & 2 deletions packages/ghc/build.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -82,11 +82,21 @@ fi
--prefix=/usr \
GHC=ghc

# Hadrian flags. These MUST be identical for the build and the install invocation:
# hadrian does not encode the flavour in the _build tree paths, so an install run
# with different flags silently redoes the entire build from scratch. It also
# defaults to -j1, so the jobs flag has to be on both as well.
#
# We build the `default` flavour (-O2; vanilla + profiling + dynamic ways) because
# downstream Haskell packages need the dynamic-way libraries. Passed explicitly
# rather than left implicit -- an implicit flavour is what broke this before.
HADRIAN_FLAGS=(-j"$(nproc)" --flavour=default --docs=none)

# Now we can run the build!
_build/bin/hadrian -j"$(nproc)" --flavour=quickest --docs=none
_build/bin/hadrian "${HADRIAN_FLAGS[@]}"

# And install!
DESTDIR=$OUTPUT_DIR _build/bin/hadrian install --prefix=/usr --docs=none
DESTDIR=$OUTPUT_DIR _build/bin/hadrian "${HADRIAN_FLAGS[@]}" install --prefix=/usr

# Refresh the package database cache so downstream builds don't see stale cache warnings
GHC_PKG="$(find "$OUTPUT_DIR" -name ghc-pkg -type f | head -1)"
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