ghc-deps.sh: also support ghc-pkg for ghc build before 7.6

Now test for "%buildroot%_bindir/ghc-pkg-$GHC_VER" and if it exists it means
we are doing a ghc build and then condition on GHC_VER to set GHC_PKG.
Otherwise just use %_bindir/ghc-pkg-$GHC_VER as usual.

There are 3 cases: 7.8, 7.6, and earlier.

ghc-deps.sh

@@ -1,11 +1,6 @@
 #!/bin/sh
 # find rpm provides and requires for Haskell GHC libraries
 
-# To use add the following lines to spec file:
-#   %define _use_internal_dependency_generator 0
-#   %define __find_requires /usr/lib/rpm/ghc-deps.sh --requires %{buildroot}%{ghclibdir}
-#   %define __find_provides /usr/lib/rpm/ghc-deps.sh --provides %{buildroot}%{ghclibdir}
-
 [ $# -ne 2 ] && echo "Usage: `basename $0` [--provides|--requires] %{buildroot}%{ghclibdir}" && exit 1
 
 set +x
@@ -15,11 +10,21 @@ PKGBASEDIR=$2
 PKGCONFDIR=$PKGBASEDIR/package.conf.d
 GHC_VER=$(basename $PKGBASEDIR | sed -e s/ghc-//)
 
-if [ -x "$PKGBASEDIR/bin/ghc-pkg" ]; then
-    # ghc-7.8
-    GHC_PKG="$PKGBASEDIR/bin/ghc-pkg --global-package-db=$PKGCONFDIR"
-elif [ -x "$PKGBASEDIR/ghc-pkg" ]; then
-    GHC_PKG="$PKGBASEDIR/ghc-pkg --global-package-db=$PKGCONFDIR"
+# for a ghc build use the new ghc-pkg
+INPLACE_GHCPKG=$PKGBASEDIR/../../bin/ghc-pkg-$GHC_VER
+
+if [ -x "$INPLACE_GHCPKG" ]; then
+    case $GHC_VER in
+        7.8.*)
+            GHC_PKG="$PKGBASEDIR/bin/ghc-pkg --global-package-db=$PKGCONFDIR"
+            ;;
+        7.6.*)
+            GHC_PKG="$PKGBASEDIR/ghc-pkg --global-package-db=$PKGCONFDIR"
+            ;;
+        *)
+            GHC_PKG="$PKGBASEDIR/ghc-pkg --global-conf=$PKGCONFDIR"
+            ;;
+    esac
 else
     GHC_PKG="/usr/bin/ghc-pkg-${GHC_VER}"
 fi

ghc-rpm-macros.spec

@@ -6,7 +6,7 @@
 #%%global without_hscolour 1
 
 Name:           ghc-rpm-macros
-Version:        1.3.7
+Version:        1.3.8
 Release:        1%{?dist}
 Summary:        RPM macros for building packages for GHC
 
@@ -93,6 +93,9 @@ EOF
 
 
 %changelog
+* Thu Oct 23 2014 Jens Petersen <petersen@redhat.com> - 1.3.8-1
+- ghc-deps.sh: support ghc-pkg for ghc build <= 7.4.2 as well
+
 * Thu Oct 16 2014 Jens Petersen <petersen@redhat.com> - 1.3.7-1
 - ghc.attr needs to handle requires for /usr/bin files too