Bug 139: portability fixes and documentation.

Document the dynamic lookup module capability in spec.xfpt.
Include a ChangeLog item.

Avoid the GNU-specific "export" make(1) directive.
Build the lookups Makefile using the existing framework.
Build with BSD Make once more.

The src/lookups/Makefile that is used at build time now has the dynamic
content come from scripts/lookups-Makefile.

Add CFLAGS_DYNAMIC support, which can be set in Local/Makefile.
Provide defaults for Linux & FreeBSD.

Ensure that build fails early if a dynamic module is requested but
CFLAGS_DYNAMIC is not defined.

3 files changed, 102 insertions, 6 deletions

diff --git a/src/scripts/Configure-Makefile b/src/scripts/Configure-Makefile
index 1b2ea1e28..abef50017 100755
--- a/src/scripts/Configure-Makefile
+++ b/src/scripts/Configure-Makefile
@@ -78,10 +78,13 @@ mf=Makefile
 mft=$mf-t
 mftt=$mf-tt
 
+look_mf=lookups/Makefile.predynamic
+look_mft=${look_mf}-t
+
 # Ensure the temporary does not exist and start the new one by setting
 # the OSTYPE and ARCHTYPE variables.
 
-rm -f $mft $mftt
+rm -f $mft $mftt $look_mf-t
 (echo "OSTYPE=$ostype"; echo "ARCHTYPE=$archtype"; echo "") > $mft || exit 1
 
 # Now concatenate the files to the temporary file. Copy the files using sed to
@@ -107,7 +110,13 @@ do   if test -r ../$f
             echo "# End of $f"
             echo ""
      fi
-done | sed 's/^LOOKUP_/export LOOKUP_/' >> $mft || exit 1
+done >> $mft || exit 1
+
+# make the lookups Makefile with the definitions
+
+## prepend stuff here; eg: grep LOOKUP_ $mft > $look_mft
+## cat ../src/lookups/Makefile >> $look_mft
+cp ../src/lookups/Makefile $look_mft
 
 # See if there is a definition of EXIM_PERL in what we have built so far.
 # If so, run Perl to find the default values for PERL_CC, PERL_CCOPTS,
@@ -158,18 +167,20 @@ cat ../OS/Makefile-Base >> $mft || exit 1
 # If the new makefile is the same as the existing one, say so, and just
 # update the timestamp. Otherwise remove the old and install the new.
 
-if      [ -s $mf ] && cmp -s $mft $mf
+if      [ -s $mf ] && cmp -s $mft $mf && [ -s $look_mf ] && cmp -s $look_mft $look_mf
 then    echo ">>> rebuilt $mf unchanged"
         echo " "
         touch $mf || exit
         rm -f $mft
-elif    rm -f $mf
+elif    rm -f $mf $look_mf
         mv $mft $mf
-then    echo ">>> New $mf installed"
+	mv $look_mft $look_mf
+then    echo ">>> New $mf & $look_mf installed"
         echo '>>> Use "make makefile" if you need to force rebuilding of the makefile'
         echo " "
 else    echo " "
         echo "*** Failed to install $mf - see $mft"
+	echo "    (or $look_mft)"
         echo " "
         exit 1;
 fi
diff --git a/src/scripts/MakeLinks b/src/scripts/MakeLinks
index 591813971..c021ace0e 100755
--- a/src/scripts/MakeLinks
+++ b/src/scripts/MakeLinks
@@ -31,7 +31,7 @@ echo ">>> Creating links to source files..."
 mkdir lookups
 cd lookups
 ln -s ../../src/lookups/README           README
-ln -s ../../src/lookups/Makefile         Makefile
+# Makefile is generated
 ln -s ../../src/lookups/cdb.c            cdb.c
 ln -s ../../src/lookups/dbmdb.c          dbmdb.c
 ln -s ../../src/lookups/dnsdb.c          dnsdb.c
diff --git a/src/scripts/lookups-Makefile b/src/scripts/lookups-Makefile
new file mode 100755
index 000000000..7069cfb69
--- /dev/null
+++ b/src/scripts/lookups-Makefile
@@ -0,0 +1,85 @@
+#! /bin/sh
+
+# We turn the configure-built build-$foo/lookups/Makefile.predynamic into Makefile
+
+input=lookups/Makefile.predynamic
+target=lookups/Makefile
+defs_source=Makefile
+tag_marker='MAGIC-TAG-MODS-OBJ-RULES-GO-HERE'
+
+tab='	'
+if grep -q "^LOOKUP.*=[ $tab]*2" "$defs_source"
+then
+  # we have work to do
+else
+  echo "No dynamic module loading support"
+  cp "$input" "$target"
+  exit 0
+fi
+
+if grep -q "^CFLAGS_DYNAMIC[ $tab]*=" "$defs_source"
+then
+  # we have a definition, we're good to go
+else
+  echo >&2 "Missing CFLAGS_DYNAMIC inhibits building dynamic module lookup"
+  exit 1
+fi
+
+tmp="$target.t"
+
+want_dynamic() {
+  local dyn_name="$1"
+  grep -q "^LOOKUP_${dyn_name}[ $tab]*=[ $tab]*2" "$defs_source"
+}
+
+want_at_all() {
+  local want_name="$1"
+  grep -q "^LOOKUP_${want_name}[ $tab]*=[ $tab]*." "$defs_source"
+}
+
+emit_module_rule() {
+  local lookup_name="$1"
+  local mod_name
+  if [ "${lookup_name%:*}" = "$lookup_name" ]
+  then
+    mod_name=$(echo $lookup_name | tr A-Z a-z)
+  else
+    mod_name="${lookup_name#*:}"
+    lookup_name="${lookup_name%:*}"
+  fi
+
+  if want_dynamic "$lookup_name"
+  then
+    echo "MODS += ${mod_name}.so"
+    echo "LOOKUP_${mod_name}_INCLUDE = \$(LOOKUP_${lookup_name}_INCLUDE)"
+    echo "LOOKUP_${mod_name}_LIBS = \$(LOOKUP_${lookup_name}_LIBS)"
+  elif want_at_all "$lookup_name"
+  then
+    echo "OBJ += ${mod_name}.o"
+  fi
+}
+
+exec 5>&1
+exec > "$tmp"
+
+sed -n "1,/$tag_marker/p" < "$input"
+
+for name_mod in \
+    CDB DBM:dbmdb DNSDB DSEARCH IBASE LSEARCH MYSQL NIS NISPLUS ORACLE \
+    PASSWD PGSQL SQLITE TESTDB WHOSON
+do
+  emit_module_rule $name_mod
+done
+
+if want_at_all LDAP
+then
+  echo "OBJ += ldap.o"
+fi
+
+sed -n "/$tag_marker/,\$p" < "$input"
+
+exec >&5
+mv "$tmp" "$target"
+
+
+# vim: set ft=sh sw=2 :