基础技巧

1  链接系统动态库和头文件的便捷方法；

    运用 pkg-config工具获取库和头文件

#
# http://www.gnu.org/software/make/manual/make.html #
CC:=gcc
INCLUDES:=$(shell pkg-config --cflags libavformat libavcodec libswscale libavutil sdl)
CFLAGS:=-Wall -ggdb
LDFLAGS:=$(shell pkg-config --libs libavformat libavcodec libswscale libavutil sdl) -lm
EXE:=tutorial01.out tutorial02.out tutorial03.out tutorial04.out\
tutorial05.out tutorial06.out tutorial07.out

#
# This is here to prevent Make from deleting secondary files.
#
.SECONDARY:

#
# $< is the first dependency in the dependency list
# $@ is the target name
#
all: dirs $(addprefix bin/, $(EXE)) tags

dirs:
mkdir -p obj
mkdir -p bin

tags: *.c
ctags *.c

bin/%.out: obj/%.o
$(CC) $(CFLAGS) $< $(LDFLAGS) -o $@

obj/%.o : %.c
$(CC) $(CFLAGS) $< $(INCLUDES) -c -o $@

clean:
rm -f obj/*
rm -f bin/*
rm -f tags

2 动态库的依赖自动解决

告诉动态链接器，也就是加载器，到-rpath指定的目录中寻找程序需要的共享库

-Wl,-rpath   + lib dir

eg: -Wl,--rpath ../x1/boss_sdk/output.oem/target/usr/lib