Test configuring a package with a custom-setup that doesn't include Cabal.

cabal-install/cabal-install.cabal

@@ -27,8 +27,14 @@ Extra-Source-Files:
   tests/IntegrationTests/custom-setup/Cabal-99998/CabalMessage.hs
   tests/IntegrationTests/custom-setup/Cabal-99999/Cabal.cabal
   tests/IntegrationTests/custom-setup/Cabal-99999/CabalMessage.hs
+  tests/IntegrationTests/custom-setup/custom-setup-without-cabal-defaultMain/Setup.hs
+  tests/IntegrationTests/custom-setup/custom-setup-without-cabal-defaultMain/custom-setup-without-cabal-defaultMain.cabal
+  tests/IntegrationTests/custom-setup/custom-setup-without-cabal/Setup.hs
+  tests/IntegrationTests/custom-setup/custom-setup-without-cabal/custom-setup-without-cabal.cabal
   tests/IntegrationTests/custom-setup/custom-setup/Setup.hs
   tests/IntegrationTests/custom-setup/custom-setup/custom-setup.cabal
+  tests/IntegrationTests/custom-setup/custom_setup_without_Cabal_doesnt_allow_Cabal_import.sh
+  tests/IntegrationTests/custom-setup/custom_setup_without_Cabal_doesnt_require_Cabal.sh
   tests/IntegrationTests/custom-setup/installs_Cabal_as_setup_dep.sh
   tests/IntegrationTests/custom/custom_dep.sh
   tests/IntegrationTests/custom/custom_dep/client/B.hs

cabal-install/tests/IntegrationTests/custom-setup/custom-setup-without-cabal-defaultMain/Setup.hs

+import Distribution.Simple
+
+main = defaultMain

cabal-install/tests/IntegrationTests/custom-setup/custom-setup-without-cabal-defaultMain/custom-setup-without-cabal-defaultMain.cabal

+name: custom-setup-without-cabal-defaultMain
+version: 1.0
+build-type: Custom
+cabal-version: >= 1.2
+
+custom-setup
+  setup-depends: base
+
+library

cabal-install/tests/IntegrationTests/custom-setup/custom-setup-without-cabal/Setup.hs

+import System.Exit
+import System.IO
+
+main = hPutStrLn stderr "My custom Setup" >> exitFailure

cabal-install/tests/IntegrationTests/custom-setup/custom-setup-without-cabal/custom-setup-without-cabal.cabal

+name: custom-setup-without-cabal
+version: 1.0
+build-type: Custom
+cabal-version: >= 99999
+
+custom-setup
+  setup-depends: base
+
+library

cabal-install/tests/IntegrationTests/custom-setup/custom_setup_without_Cabal_doesnt_allow_Cabal_import.sh

+. ./common.sh
+cd custom-setup-without-cabal-defaultMain
+
+# This package has explicit setup dependencies that do not include Cabal.
+# Compilation should fail because Setup.hs imports Distribution.Simple.
+! cabal new-build custom-setup-without-cabal-defaultMain > output 2>&1
+cat output
+grep -q "\(Could not find module\|Failed to load interface for\).*Distribution\\.Simple" output \
+    || die "Should not have been able to import Cabal"
+
+grep -q "It is a member of the hidden package .*Cabal-" output \
+    || die "Cabal should be available"

cabal-install/tests/IntegrationTests/custom-setup/custom_setup_without_Cabal_doesnt_require_Cabal.sh

+. ./common.sh
+cd custom-setup-without-cabal
+
+# This package has explicit setup dependencies that do not include Cabal.
+# new-build should try to build it, even though the cabal-version cannot be
+# satisfied by an installed version of Cabal (cabal-version: >= 99999). However,
+# configure should fail because Setup.hs just prints an error message and exits.
+! cabal new-build custom-setup-without-cabal > output 2>&1
+cat output
+grep -q "My custom Setup" output \
+    || die "Expected output from custom Setup"