contrib: helper to merge Libs and Libs.private in pkg-config files

pkg-config is unable to autodetect whether a package is linked
statically or not. This helper just moves Libs.private into Libs
manually in case only a static library is built. Most if not all of
contribs are built that way.
(cherry picked from commit 3ce29fe1)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

contrib/src/main.mak

@@ -268,6 +268,7 @@ UNPACK = $(RM) -R $@ \
 	$(foreach f,$(filter %.zip,$^), && unzip $(f))
 UNPACK_DIR = $(basename $(basename $(notdir $<)))
 APPLY = (cd $(UNPACK_DIR) && patch -p1) <
+pkg_static = (cd $(UNPACK_DIR) && ../../src/pkg-static.sh $(1))
 MOVE = mv $(UNPACK_DIR) $@ && touch $@
 
 AUTOMAKE_DATA_DIRS=$(abspath $(dir $(shell which automake))/../share/automake*)

contrib/src/pkg-static.sh

+#! /bin/sh
+# Copyright (C) 2012 Rémi Denis-Courmont
+# This file is distributed under the same license as the vlc package.
+
+if test -z "$1" || test -n "$2"; then
+	echo "Usage: $0 <file.pc>" >&2
+	echo "Merges the pkg-config Libs.private stanza into Libs stanza." >&2
+	exit 1
+fi
+
+exec <"$1" >"$1.tmp" || exit $?
+
+PUBLIC=""
+PRIVATE=""
+
+while read LINE; do
+	pub="${LINE#Libs:}"
+	priv="${LINE#Libs.private:}"
+	if test "$pub" != "$LINE"; then
+		PUBLIC="$pub"
+	elif test "$priv" != "$LINE"; then
+		PRIVATE="$priv"
+	else
+		echo "$LINE"
+	fi
+done
+echo "Libs: $PUBLIC $PRIVATE"
+
+mv -f -- "$1.tmp" "$1"