Introduce possibility for crossbuilding

Make.config

@@ -0,0 +1,53 @@
+#
+# User defined Makefile options for the Video Disk Recorder
+#
+# Copy this file to 'Make.config' and change the parameters as necessary.
+#
+# See the main source file 'vdr.c' for copyright information and
+# how to reach the author.
+#
+# $Id: Make.config.template 3.0 2013/02/18 10:55:39 kls Exp $
+
+### The C compiler and options:
+
+CC       = gcc
+CFLAGS   = -g -O3 -Wall
+
+CXX      = g++
+CXXFLAGS = -g -O3 -Wall -Werror=overloaded-virtual -Wno-parentheses
+
+### Set Flags for Cortex-A8 platform
+CPUOPT = armv7l
+CFLAGS = -pipe -O2 -mfloat-abi=hard -mtune=cortex-a8 -D__ARM_NEON__ -mfpu=neon -march=armv7-a -fPIC -Werror=overloaded-virtual -Wno-parentheses -fsigned-char
+
+### Set environment for crosscompiling
+HOST=arm-linux-gnueabihf
+
+ifeq ($(shell uname -m),armv7l)
+  BUILD=arm-linux-gnueabihf
+  CROSS_COMPILE=
+  TOOLCHAIN = /usr/lib
+else
+  BUILD = amd64-linux
+  CROSS_COMPILE = ${HOST}-
+  TOOLCHAIN = /usr/lib/${HOST}
+  DESTDIR   = $(BASEDIR)/export
+endif
+
+export CFLAGS+=${LDFLAGS}
+export CXXFLAGS=${CFLAGS}
+export CPPFLAGS=${CFLAGS}
+export LD=${CROSS_COMPILE}ld
+export AR=${CROSS_COMPILE}ar
+export CC=${CROSS_COMPILE}gcc
+export CXX=${CROSS_COMPILE}g++
+export CXXCPP=${CXX} -E
+export RANLIB=${CROSS_COMPILE}ranlib
+export STRIP=${CROSS_COMPILE}strip
+export OBJDUMP=${CROSS_COMPILE}objdump
+
+### The directory environment:
+
+# Default directories (adjust as necessary or desired):
+
+PREFIX    = /usr/local

Makefile

@@ -1,22 +1,24 @@
+include Make.config
+
 TARGET = libvdpau_sunxi.so.1
 SRC = device.c presentation_queue.c surface_output.c surface_video.c \
 	surface_bitmap.c video_mixer.c decoder.c handles.c ve.c \
 	h264.c mpeg12.c mpeg4.c rgba.c tiled_yuv.S
-CFLAGS = -Wall -O3
-LDFLAGS =
-LIBS = -lrt -lm -lX11 -lpthread
-CC = gcc
+CFLAGS ?= -Wall -O3
+LDFLAGS ?=
+LIBS ?= -lrt -lm -lX11 -lpthread
+CC ?= gcc
 
 MAKEFLAGS += -rR --no-print-directory
 
-DEP_CFLAGS = -MD -MP -MQ $@
-LIB_CFLAGS = -fpic -fvisibility=hidden
-LIB_LDFLAGS = -shared -Wl,-soname,$(TARGET)
+DEP_CFLAGS ?= -MD -MP -MQ $@
+LIB_CFLAGS ?= -fpic -fvisibility=hidden
+LIB_LDFLAGS ?= -shared -Wl,-soname,$(TARGET)
 
 OBJ = $(addsuffix .o,$(basename $(SRC)))
 DEP = $(addsuffix .d,$(basename $(SRC)))
 
-MODULEDIR = $(shell pkg-config --variable=moduledir vdpau)
+MODULEDIR = $(shell export PKG_CONFIG_PATH=${TOOLCHAIN}/pkgconfig; pkg-config --variable=moduledir vdpau)
 
 ifeq ($(MODULEDIR),)
 MODULEDIR=/usr/lib/vdpau