Haskell CI: exclude haddock step for GHC < 8.6

Author: andreasabel

.github/workflows/haskell-ci.yml

@@ -283,6 +283,7 @@ jobs:
           if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "package hackage-security-HTTP" >> cabal.project ; fi
           if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "    ghc-options: -Werror=missing-methods" >> cabal.project ; fi
           cat >> cabal.project <<EOF
+          constraints: base-compat >= 0.12.2
           EOF
           if $HEADHACKAGE; then
           echo "allow-newer: $($HCPKG list --simple-output | sed -E 's/([a-zA-Z-]+)-[0-9.]+/*:\1,/g')" >> cabal.project
@@ -331,11 +332,11 @@ jobs:
           ${CABAL} -vnormal check
       - name: haddock
         run: |
-          $CABAL v2-haddock --disable-documentation --haddock-all $ARG_COMPILER --with-haddock $HADDOCK $ARG_TESTS $ARG_BENCH all
+          if [ $((HCNUMVER >= 80600)) -ne 0 ] ; then $CABAL v2-haddock --disable-documentation --haddock-all $ARG_COMPILER --with-haddock $HADDOCK $ARG_TESTS $ARG_BENCH all ; fi
       - name: unconstrained build
         run: |
-          if [ $((HCNUMVER < 90600)) -ne 0 ] ; then rm -f cabal.project.local ; fi
-          if [ $((HCNUMVER < 90600)) -ne 0 ] ; then $CABAL v2-build $ARG_COMPILER --disable-tests --disable-benchmarks all ; fi
+          rm -f cabal.project.local
+          $CABAL v2-build $ARG_COMPILER --disable-tests --disable-benchmarks all
       - name: prepare for constraint sets
         run: |
           rm -f cabal.project.local

cabal.haskell-ci

@@ -2,9 +2,19 @@ branches: master ci-*
 
 ghc-head: True
 
--- Andreas, 2023-02-20: see https://github.com/haskell/hackage-security/pull/291
--- unconstrained build with head.hackage produces failing build plans
-unconstrained: < 9.6
+-- Andreas, 2023-07-01: We use some haddock features that are new in 8.6.
+haddock: >= 8.6
+
+-- -- Andreas, 2023-02-20: see https://github.com/haskell/hackage-security/pull/291
+-- -- unconstrained build with head.hackage produces failing build plans
+-- unconstrained: < 9.6
+--
+-- Andreas, 2023-07-01
+-- Ryan GI Scott suggests this instead:
+-- see https://github.com/haskell-CI/haskell-ci/issues/643#issuecomment-1466195957
+raw-project
+  constraints:
+    base-compat >= 0.12.2
 
 constraint-set no-lukko
   ghc: >=8.2