From 14ea0bea67dc606a55b1a7c29ce7e8595bd86f64 Mon Sep 17 00:00:00 2001
From: Phil Pennock <pdp@exim.org>
Date: Tue, 15 Apr 2014 23:25:45 -0700
Subject: [PATCH] Bail configuration on missing package

If we're configured to use pkg-config (or pcre-config) and the tool is
not available or does not know about the package we ask for, that should
be a fatal configuration error.

We should not silently ignore the missing package, then try to compile,
and have missing header warnings from the compiler.  Eg, if we're told
to support GSASL, we'll try to compile the client code, and without
compiler flags, we'll either fail to compile (missing headers) or fail
to link, which obscures the source of the errors.

This change will only break people who had builds set to have Exim
depend upon non-existent packages, and that _needs_ to break.
---
 src/scripts/Configure-Makefile | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/scripts/Configure-Makefile b/src/scripts/Configure-Makefile
index 5e8a72683..eeb26eeb1 100755
--- a/src/scripts/Configure-Makefile
+++ b/src/scripts/Configure-Makefile
@@ -142,6 +142,10 @@ then
         fi
         if [ ".$need_this" != "." ]; then
           tls_include=`pkg-config --cflags $pc_value`
+          if [ $? -ne 0 ]; then
+            echo >&2 "*** Missing pkg-config for package $pc_value (for Exim $var build option)"
+            exit 1
+          fi
           tls_libs=`pkg-config --libs $pc_value`
           echo "TLS_INCLUDE=$tls_include"
           echo "TLS_LIBS=$tls_libs"
@@ -161,6 +165,10 @@ then
         else
           # main binary
           cflags=`pkg-config --cflags $pc_value`
+          if [ $? -ne 0 ]; then
+            echo >&2 "*** Missing pkg-config for package $pc_value (for Exim $var build option)"
+            exit 1
+          fi
           libs=`pkg-config --libs $pc_value`
           if [ "$var" != "${var#LOOKUP_}" ]; then
             echo "LOOKUP_INCLUDE += $cflags"
@@ -178,6 +186,10 @@ then
         case $PCRE_CONFIG in
           yes|YES|y|Y)
             cflags=`pcre-config --cflags`
+            if [ $? -ne 0 ]; then
+              echo >&2 "*** Missing pcre-config for regular expression support"
+              exit 1
+            fi
             libs=`pcre-config --libs`
             if [ ".$cflags" != "." ]; then
               echo "INCLUDE += $cflags"
@@ -196,6 +208,10 @@ then
   echo "# End of pkg-config fixups"
   echo
   ) >> $mft
+  subexit=$?
+  if [ $subexit -ne 0 ]; then
+    exit $subexit
+  fi
 fi
 rm -f $mftt
 
-- 
2.30.2