From 0cc9542ab26b35cba3a5523acb8991eb18ce0656 Mon Sep 17 00:00:00 2001
From: Phil Pennock <pdp@exim.org>
Date: Thu, 27 Jan 2011 19:07:05 -0500
Subject: [PATCH] Permit make values to be indented or in env.

It appears some make(1)s are not complaining about variables defined
with leading whitespace on the line.  Permit that where we can, for the
lookups, but it's not tenable for CFLAGS_DYNAMIC.

Some people are specifying knobs on the make command-line, so we get
them via the environment.

Tested: indented LOOKUP_CDB and commented out LOOKUP_DNSDB, supplying it
via { make LOOKUP_DNSDB=yes }.  { exim -d --version } shows both are
built-in, no results from { fgrep DNSDB build-*/Makefile }.
---
 doc/doc-txt/ChangeLog        |  4 ++++
 src/scripts/lookups-Makefile | 16 ++++++++++++++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index b225b7878..f196095ab 100644
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -16,6 +16,10 @@ TF/01 Update valgrind.h and memcheck.h to copies from valgrind-3.6.0.
 TF/02 Bugzilla 139: Avoid using the += operator in the modular lookup
       makefiles for portability to HP-UX and POSIX correctness.
 
+PP/01 Permit LOOKUP_foo enabling on the make command-line.
+      Also via indented variable definition in the Makefile.
+      (Debugging by Oliver Heesakkers).
+
 
 Exim version 4.74
 -----------------
diff --git a/src/scripts/lookups-Makefile b/src/scripts/lookups-Makefile
index dd0472b8d..d5c450e4f 100755
--- a/src/scripts/lookups-Makefile
+++ b/src/scripts/lookups-Makefile
@@ -21,6 +21,9 @@ tab='	'
 # 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.
 
+# 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"
 then
   # we have a definition, we're good to go
@@ -32,14 +35,23 @@ 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.
+
 want_dynamic() {
   local dyn_name="$1"
-  grep -q "^LOOKUP_${dyn_name}[ $tab]*=[ $tab]*2" "$defs_source"
+  local re="LOOKUP_${dyn_name}[ $tab]*=[ $tab]*2"
+  env | grep -q "^$re"
+  if [ $? -eq 0 ]; then return 0; fi
+  grep -q "^[ $tab]*$re" "$defs_source"
 }
 
 want_at_all() {
   local want_name="$1"
-  grep -q "^LOOKUP_${want_name}[ $tab]*=[ $tab]*." "$defs_source"
+  local re="LOOKUP_${want_name}[ $tab]*=[ $tab]*."
+  env | grep -q "^$re"
+  if [ $? -eq 0 ]; then return 0; fi
+  grep -q "^[ $tab]*$re" "$defs_source"
 }
 
 # The values of these variables will be emitted into the Makefile.
-- 
2.30.2