Revert "Add support for build --assume-deps-up-to-date flag, partial fix to #2775 (#3287)"

This reverts commit 85a76c9d.

Cabal/Cabal.cabal

@@ -107,7 +107,6 @@ extra-source-files:
   tests/PackageTests/BenchmarkOptions/BenchmarkOptions.cabal
   tests/PackageTests/BenchmarkOptions/test-BenchmarkOptions.hs
   tests/PackageTests/BenchmarkStanza/my.cabal
-  tests/PackageTests/BuildAssumeDepsUpToDate/BuildAssumeDepsUpToDate.cabal
   tests/PackageTests/BuildDeps/GlobalBuildDepsNotAdditive1/GlobalBuildDepsNotAdditive1.cabal
   tests/PackageTests/BuildDeps/GlobalBuildDepsNotAdditive1/MyLibrary.hs
   tests/PackageTests/BuildDeps/GlobalBuildDepsNotAdditive2/GlobalBuildDepsNotAdditive2.cabal

Cabal/Distribution/Simple/Build.hs

@@ -81,35 +81,7 @@ build    :: PackageDescription  -- ^ Mostly information from the .cabal file
          -> BuildFlags          -- ^ Flags that the user passed to build
          -> [ PPSuffixHandler ] -- ^ preprocessors to run before compiling
          -> IO ()
-build pkg_descr lbi flags suffixes
- | fromFlag (buildAssumeDepsUpToDate flags) = do
-  -- TODO: if checkBuildTargets ignores a target we may accept
-  -- a --assume-deps-up-to-date with multiple arguments. Arguably, we should
-  -- error early in this case.
-  target <- readTargetInfos verbosity pkg_descr lbi (buildArgs flags) >>= \r -> case r of
-      [] -> die "In --assume-deps-up-to-date mode you must specify a target"
-      [target] -> return target
-      _ -> die "In --assume-deps-up-to-date mode you can only build a single target"
-  -- NB: do NOT 'createInternalPackageDB'; we don't want to delete it.
-  -- But this means we have to be careful about unregistering
-  -- ourselves.
-  let dbPath = internalPackageDBPath lbi distPref
-      internalPackageDB = SpecificPackageDB dbPath
-      clbi = targetCLBI target
-      comp = targetComponent target
-  -- TODO: do we need to unregister libraries?  In any case, this would
-  -- need to be done in the buildLib functionality.
-  -- Do the build
-  initialBuildSteps distPref pkg_descr lbi clbi verbosity
-  let bi     = componentBuildInfo comp
-      progs' = addInternalBuildTools pkg_descr lbi bi (withPrograms lbi)
-      lbi'   = lbi {
-                 withPrograms  = progs',
-                 withPackageDB = withPackageDB lbi ++ [internalPackageDB]
-               }
-  buildComponent verbosity (buildNumJobs flags) pkg_descr
-                 lbi' suffixes comp clbi distPref
- | otherwise = do
+build pkg_descr lbi flags suffixes = do
   targets <- readTargetInfos verbosity pkg_descr lbi (buildArgs flags)
   let componentsToBuild = neededTargetsInBuildOrder' pkg_descr lbi (map nodeKey targets)
   info verbosity $ "Component build order: "

Cabal/Distribution/Simple/Setup.hs

@@ -1598,9 +1598,6 @@ data BuildFlags = BuildFlags {
     buildDistPref    :: Flag FilePath,
     buildVerbosity   :: Flag Verbosity,
     buildNumJobs     :: Flag (Maybe Int),
-    -- | If this is true, we don't build the dependencies of
-    -- 'buildArgs': only the directly referenced components.
-    buildAssumeDepsUpToDate :: Flag Bool,
     -- TODO: this one should not be here, it's just that the silly
     -- UserHooks stop us from passing extra info in other ways
     buildArgs :: [String]
@@ -1618,7 +1615,6 @@ defaultBuildFlags  = BuildFlags {
     buildDistPref    = mempty,
     buildVerbosity   = Flag normal,
     buildNumJobs     = mempty,
-    buildAssumeDepsUpToDate     = Flag False,
     buildArgs        = []
   }
 
@@ -1666,11 +1662,6 @@ buildOptions :: ProgramDb -> ShowOrParseArgs
 buildOptions progDb showOrParseArgs =
   [ optionNumJobs
       buildNumJobs (\v flags -> flags { buildNumJobs = v })
-
-  , option "" ["assume-deps-up-to-date"]
-      "One-shot build"
-      buildAssumeDepsUpToDate (\c flags -> flags { buildAssumeDepsUpToDate = c })
-      trueArg
   ]
 
   ++ programDbPaths progDb showOrParseArgs

Cabal/tests/PackageTests/BuildAssumeDepsUpToDate/.gitignore

-*.hs

Cabal/tests/PackageTests/BuildAssumeDepsUpToDate/BuildAssumeDepsUpToDate.cabal

--- Initial BuildAssumeDepsUpToDate.cabal generated by cabal init.  For further 
--- documentation, see http://haskell.org/cabal/users-guide/
-
-name:                BuildAssumeDepsUpToDate
-version:             0.1.0.0
-license:             BSD3
-author:              Edward Z. Yang
-maintainer:          ezyang@cs.stanford.edu
-build-type:          Simple
-cabal-version:       >=1.10
-
-library
-  exposed-modules:     A
-  build-depends:       base
-  default-language:    Haskell2010
-
-executable myprog
-  main-is: Main.hs
-  hs-source-dirs: myprog
-  build-depends: BuildAssumeDepsUpToDate, base
-  default-language:    Haskell2010

Cabal/tests/PackageTests/BuildAssumeDepsUpToDate/myprog/.gitignore

-*.hs

Cabal/tests/PackageTests/Tests.hs

@@ -526,24 +526,6 @@ tests config = do
   tc "Regression/T3847" $ do
     cabal "configure" ["--disable-tests"]
 
-  -- Test build --assume-deps-up-to-date
-  mtc "BuildAssumeDepsUpToDate" $ \step -> do
-    step "Initial build"
-    pkg_dir <- packageDir
-    liftIO $ writeFile (pkg_dir </> "A.hs") "module A where\na = \"a1\""
-    liftIO $ writeFile (pkg_dir </> "myprog/Main.hs") "import A\nmain = print (a ++ \" b1\")"
-    cabal_build []
-    runExe' "myprog" []
-        >>= assertOutputContains "a1 b1"
-
-    step "Rebuild executable only"
-    ghcFileModDelay
-    liftIO $ writeFile (pkg_dir </> "A.hs") "module A where\na = \"a2\""
-    liftIO $ writeFile (pkg_dir </> "myprog/Main.hs") "import A\nmain = print (a ++ \" b2\")"
-    cabal "build" ["--assume-deps-up-to-date", "myprog"]
-    runExe' "myprog" []
-        >>= assertOutputContains "a1 b2"
-
   -- Test error message we report when a non-buildable target is
   -- requested to be built
   -- TODO: We can give a better error message here, see #3858.

cabal-install/Distribution/Client/ProjectPlanning.hs

@@ -2659,7 +2659,6 @@ setupHsBuildFlags _ _ verbosity builddir =
       buildProgramArgs  = mempty, --unused, set at configure time
       buildVerbosity    = toFlag verbosity,
       buildDistPref     = toFlag builddir,
-      buildAssumeDepsUpToDate = toFlag False,
       buildNumJobs      = mempty, --TODO: [nice to have] sometimes want to use toFlag (Just numBuildJobs),
       buildArgs         = mempty  -- unused, passed via args not flags
     }