in-library: set pkgDescrFile

Author: sheaf

cabal-install/src/Distribution/Client/InLibrary.hs

@@ -53,6 +53,8 @@ import Distribution.Types.BuildType
 import Distribution.Types.ComponentRequestedSpec
 import qualified Distribution.Types.LocalBuildConfig as LBC
 import Distribution.Types.LocalBuildInfo
+import Distribution.Utils.Path
+  ( relativeSymbolicPath )
 
 import qualified Data.Set as Set
 
@@ -216,12 +218,19 @@ configure
             OneComponentRequestedSpec{} -> True
             ComponentRequestedSpec{} -> False
       externalPkgDeps <- Cabal.configureDependencies verbosity useExternalInternalDeps pkg_info pkg_descr compRequested
-      lbi <- Cabal.configureComponents lbc2 pbd3 installedPkgs promisedDeps externalPkgDeps
+      lbi1 <- Cabal.configureComponents lbc2 pbd3 installedPkgs promisedDeps externalPkgDeps
+
+      pkgDescrFile <-
+        case Cabal.flagToMaybe $ Cabal.configCabalFilePath cfg of
+          Just pkgFile -> return pkgFile
+          Nothing -> relativeSymbolicPath <$> tryFindPackageDesc verbosity mbWorkDir
+      let lbi2 = lbi1 { pkgDescrFile = Just pkgDescrFile }
+
       -- Write the LocalBuildInfo to disk. This is needed, for instance, if we
       -- skip re-configuring; we retrieve the LocalBuildInfo stored on disk from
       -- the previous invocation of 'configure' and pass it to 'build'.
-      Cabal.writePersistBuildConfig mbWorkDir distPref lbi
-      return lbi
+      Cabal.writePersistBuildConfig mbWorkDir distPref lbi2
+      return lbi2
 
 wantComponent :: ComponentRequestedSpec -> Component -> Bool
 wantComponent compReq comp = case compReq of