Handle PKG_CONFIG_PATH in Local/Makefile

Handle PKG_CONFIG_PATH, stripping whitespace expanding globs, collecting
multiple sets and just build one variable, and use it in environment at
configure time so that the libraries are found.

4 files changed, 45 insertions, 4 deletions

diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index 1c282ac8e..95d822df5 100644
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -13,6 +13,9 @@ JH/01 Rework error string handling in TLS interface so that the caller in
       string to be attached to addresses during delivery, and collapses
       pairs of long lines into single ones.
 
+PP/01 Allow PKG_CONFIG_PATH to be set in Local/Makefile and use it correctly
+      during configuration.  Wildcards are allowed and expanded.
+
 
 Exim version 4.89
 -----------------
diff --git a/doc/doc-txt/NewStuff b/doc/doc-txt/NewStuff
index dd70201e5..ac876ed9f 100644
--- a/doc/doc-txt/NewStuff
+++ b/doc/doc-txt/NewStuff
@@ -6,6 +6,13 @@ Before a formal release, there may be quite a lot of detail so that people can
 test from the snapshots or the Git before the documentation is updated. Once
 the documentation is updated, this file is reduced to a short list.
 
+Version 4.90
+------------
+
+ 1. PKG_CONFIG_PATH can now be set in Local/Makefile;
+    wildcards will be expanded, values are collapsed.
+
+
 Version 4.89
 ------------
 
diff --git a/src/scripts/Configure-Makefile b/src/scripts/Configure-Makefile
index 3e486a6bb..b6f2e2e09 100755
--- a/src/scripts/Configure-Makefile
+++ b/src/scripts/Configure-Makefile
@@ -78,6 +78,8 @@ fi
 mf=Makefile
 mft=$mf-t
 mftt=$mf-tt
+mftepcp=$mf-tepcp
+mftepcp2=$mf-tepcp2
 
 look_mf=lookups/Makefile
 look_mf_pre=${look_mf}.predynamic
@@ -86,7 +88,7 @@ look_mf_post=${look_mf}.postdynamic
 # Ensure the temporary does not exist and start the new one by setting
 # the OSTYPE and ARCHTYPE variables.
 
-rm -f $mft $mftt $look_mf-t
+rm -f $mft $mftt $mftepcp $mftepcp2 $look_mf-t
 (echo "OSTYPE=$ostype"; echo "ARCHTYPE=$archtype"; echo "") > $mft || exit 1
 
 # Now concatenate the files to the temporary file. Copy the files using sed to
@@ -116,9 +118,33 @@ done \
      | sed 's/^TMPDIR=/EXIM_&/' \
      >> $mft || exit 1
 
+# handle PKG_CONFIG_PATH because we need it in our env, and we want to handle
+# wildcards; note that this logic means all setting _appends_ values, never
+# replacing; if that's a problem, we can revisit.
+sed -n "s/^[$st]*PKG_CONFIG_PATH[$st]*[+]*=[$st]*//p" $mft | \
+  sed "s/[$st]*\$//" >> $mftepcp
+if test -s ./$mftepcp
+then
+  # expand any wildcards and strip spaces, to make it a real PATH-like variable
+  ( IFS=":${IFS-$st}"; for P in `cat ./$mftepcp`; do echo "$P"; done ) | xargs | sed "s/[$st]/:/g" >./$mftepcp2
+  sed "s/^/PKG_CONFIG_PATH='/" < ./$mftepcp2 | sed "s/\$/'/" > ./$mftepcp
+  . ./$mftepcp
+  export PKG_CONFIG_PATH
+  egrep -v "^[$st]*PKG_CONFIG_PATH[$st]*=" ./$mft > ./$mftt
+  rm -f ./$mft
+  (
+    echo "# Collapsed PKG_CONFIG_PATH in build-prep:"
+    sed "s/'//g" ./$mftepcp
+    echo "# End of collapsed PKG_CONFIG_PATH"
+    echo ""
+    cat ./$mftt
+  ) > ./$mft
+  rm -f ./$mftt
+fi
+rm -f ./$mftepcp ./$mftepcp2
+
 # handle pkg-config
 # beware portability of extended regexps with sed.
-
 egrep "^[$st]*(AUTH|LOOKUP)_[A-Z0-9_]*[$st]*=[$st]*" $mft | \
   sed "s/[$st]*=/='/" | \
   sed "s/\$/'/" > $mftt
@@ -165,8 +191,8 @@ then
               echo "CFLAGS += $tls_include"
               echo "LDFLAGS += $tls_libs"
             else
-              echo "CFLAGS += $(libgcrypt-config --cflags)"
-              echo "LDFLAGS += $(libgcrypt-config --libs)"
+              echo "CFLAGS += `libgcrypt-config --cflags`"
+              echo "LDFLAGS += `libgcrypt-config --libs`"
             fi
           fi
         fi
diff --git a/src/src/EDITME b/src/src/EDITME
index df74aacde..956b1e1e2 100644
--- a/src/src/EDITME
+++ b/src/src/EDITME
@@ -192,6 +192,11 @@ SPOOL_DIRECTORY=/var/spool/exim
 # least one type of lookup. You should consider whether you want to build
 # the Exim monitor or not.
 
+# If you need to override how pkg-config finds configuration files for
+# installed software, then you can set that here; wildcards will be expanded.
+
+# PKG_CONFIG_PATH=/usr/local/opt/openssl/lib/pkgconfig : /opt/*/lib/pkgconfig
+
 
 #------------------------------------------------------------------------------
 # These settings determine which individual router drivers are included in the