Avoid spurious rebuilds of the dynamic lookups Makefile.

[users/jgh/exim.git] / src / scripts / lookups-Makefile

diff --git a/src/scripts/lookups-Makefile b/src/scripts/lookups-Makefile
index 14c15259e8ac1edbfc56cb93a8d558250bfa5b73..e7aeaa08aaa0f818936dfabbc4d28c1a635f17e1 100755 (executable)
--- a/src/scripts/lookups-Makefile
+++ b/src/scripts/lookups-Makefile
@@ -28,8 +28,8 @@ then
 fi
 
 input=lookups/Makefile.predynamic
-target=lookups/Makefile
-defs_source=Makefile
+target=lookups/Makefile.postdynamic
+defs_source=Makefile-t
 tag_marker='MAGIC-TAG-MODS-OBJ-RULES-GO-HERE'
 
 tab='  '
@@ -44,20 +44,19 @@ export LC_ALL
 # nb: do not permit leading whitespace for this, as CFLAGS_DYNAMIC is exported
 # to the lookups subdir via a line with leading whitespace which otherwise
 # matches
-if grep -q "^CFLAGS_DYNAMIC[ $tab]*=" "$defs_source"
+if grep -q "^CFLAGS_DYNAMIC[ $tab?:]*=" "$defs_source"
 then
   # we have a definition, we're good to go
+  echo >&2 ">>> Creating lookups/Makefile for building dynamic modules"
   enable_dynamic=yes
 else
-  echo >&2 "Missing CFLAGS_DYNAMIC inhibits building dynamic module lookup"
+  echo >&2 ">>> Creating lookups/Makefile without dynamic module support"
   enable_dynamic=''
   # We always do something now, since there should always be a lookup,
   # and now we need to run in order to put the OBJ=$(OBJ)+ rules in.  So we
   # continue on.
 fi
 
-tmp="$target.t"
-
 # For the want_ checks, we need to let the user override values from the make
 # command-line, not just check the Makefile.
 
@@ -96,7 +95,7 @@ emit_module_rule() {
   if want_dynamic "$lookup_name"
   then
     if [ -z "$enable_dynamic" ]; then
-      echo >&2 "Inhibited dynamic modules prevents building dynamic $lookup_name"
+      echo >&2 "Missing CFLAGS_DYNAMIC prevents building dynamic $lookup_name"
       exit 1
     fi
     MODS="${MODS} ${mod_name}.so"
@@ -116,8 +115,9 @@ emit_module_rule() {
   fi
 }
 
+rm -f "$target"
 exec 5>&1
-exec > "$tmp"
+exec > "$target"
 
 sed -n "1,/$tag_marker/p" < "$input"
 
@@ -145,7 +145,7 @@ echo "OBJ = $OBJ"
 sed -n "/$tag_marker/,\$p" < "$input"
 
 exec >&5
-mv "$tmp" "$target"
 
+# Configure-Makefile will move $target into place
 
 # vim: set ft=sh sw=2 :