patsubst需要一个编译多个c文件的makefile

1、针对习题6.6中的源文件，编写makefile文件，并执行make命令生成可执行程序，要求如下：

1～5需求的makefile，使用时注意把网页的缩进修改为tab SRCS:=$(wildcard *.c) OBJS:=$(patsubst %.c,%.o, $(SRCS)) EXEC:=hello_world debugflag:= CC:= all:$(EXEC) @echo "build $(EXEC) essful!" $(EXEC):$(OBJS) $(CC) $(debugflag) -o $@ $< .PHONY: clean clean: @-rm -f $(EXEC) *.o 需求6不是很理解，能否说详细点。

如何用Android NDK编译FFmpeg

Android内置的编解码器实在太少，于是我们需要FFmpeg。

Android提供了NDK，为我们使用FFmpeg这种C语言代码提供了方便。

不过为了用NDK编译FFmpeg，还真的花费了不少时间，也得到了很多人的帮助，最应该谢谢havlenapetr。

我觉得我现在这些方法算是比较简洁的了－－ 下面就尽量详细的说一下我是怎么在项目中使用FFmpeg的，但是基于我混乱的表达能力，有不明白的就问我。

你得了解JNI和Android NDK的基本用法，若觉得我的文章还不错，可以看之前写的JNI简单入门和Android NDK入门 首先创建一个标准的Android项目vPlayer android create project -n vPlayer -t 8 -p vPlayer -k me.abitno.vplayer -a PlayerView 然后在vPlayer目录里 mkdir jni && cd jni wget /releases/ffmpeg-0.6.tar.bz2 tar xf ffmpeg-0.6.tar.bz2 && mv ffmpeg-0.6 ffmpeg && cd ffmpeg 在ffmpeg下新建一个config.sh，内容如下，注意把PREBUILT和PLATFORM设置正确。

另外里面有些参数你也可以自行调整，我主要是为了配置一个播放器而这样设置的。

#!/bin/bash PREBUILT=/home/abitno/Android/android-ndk-r4/build/prebuilt/linux-x86/arm-eabi-4.4.0 PLATFORM=/home/abitno/Android/android-ndk-r4/build/platforms/android-8/arch-arm ./configure --target-os=linux --arch=arm --enable-version3 --enable-gpl --enable-nonfree --disable-stripping --disable-ffmpeg --disable-ffplay --disable-ffserver --disable-ffprobe --disable-encoders --disable-muxers --disable-devices --disable-protocols --enable-protocol=file --enable-avfilter work --disable-mpegaudio-hp --disable-avdevice pile =$PREBUILT/bin/ --cross-prefix=$PREBUILT/bin/arm-eabi- --nm=$PREBUILT/bin/arm-eabi-nm --extra-cflags="-fPIC -DANDROID" --disable-asm --enable-neon --enable-armv5te --extra-ldflags="-Wl,-T,$PREBUILT/arm-eabi/lib/ldscripts/armelf.x -Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib $PREBUILT/lib//arm-eabi/4.4.0/crtbegin.o $PREBUILT/lib//arm-eabi/4.4.0/crtend.o -lc -lm -ldl" 运行config.sh开始configure chmod +x config.sh ./config.sh configure完成后，编辑刚刚生成的config.h，找到这句 #define restrict restrict Android的GCC不支持restrict关键字，于是修改成下面这样 #define restrict 编辑libavutil/libm.h，把其中的static方法都删除。

分别修改libavcodec、libavfilter、libavformat、libavutil、libpostproc和libswscale下的Makefile，把下面两句删除 include $(SUBDIR)../subdir.mak include $(SUBDIR)../config.mak 在ffmpeg下添加一个文件av.mk，内容如下 # LOCAL_PATH is one of libavutil, libavcodec, libavformat, or libswscale #include $(LOCAL_PATH)/../config-$(TARGET_ARCH).mak include $(LOCAL_PATH)/../config.mak OBJS := OBJS-yes := MMX-OBJS-yes := include $(LOCAL_PATH)/Makefile # collect objects OBJS-$(HAVE_MMX) += $(MMX-OBJS-yes) OBJS += $(OBJS-yes) FFNAME := lib$(NAME) FFLIBS := $(foreach,NAME,$(FFLIBS),lib$(NAME)) FFCFLAGS = -DHAVE_AV_CONFIG_H pare -Wno-switch -Wno-pointer-sign FFCFLAGS += -DTARGET_CONFIG="config-$(TARGET_ARCH).h" ALL_S_FILES := $(wildcard $(LOCAL_PATH)/$(TARGET_ARCH)/*.S) ALL_S_FILES := $(addprefix $(TARGET_ARCH)/, $(notdir $(ALL_S_FILES))) ifneq ($(ALL_S_FILES),) ALL_S_OBJS := $(patsubst %.S,%.o,$(ALL_S_FILES)) C_OBJS := $(filter-out $(ALL_S_OBJS),$(OBJS)) S_OBJS := $(filter $(ALL_S_OBJS),$(OBJS)) else C_OBJS := $(OBJS) S_OBJS := endif C_FILES := $(patsubst %.o,%.c,$(C_OBJS)) S_FILES := $(patsubst %.o,%.S,$(S_OBJS)) FFFILES := $(sort $(S_FILES)) $(sort $(C_FILES)) 接下来要添加一系列的Android.mk，在jni根目录下的内容如下 include $(all-subdir-makefiles) 在ffmpeg目录下，Android.mk LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_STATIC_LIBRARIES := libavformat libavcodec libavutil libpostproc libswscale LOCAL_MODULE := ffmpeg include $(BUILD_SHARED_LIBRARY) include $(call all-makefiles-under,$(LOCAL_PATH)) libavformat/Android.mk LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) include $(LOCAL_PATH)/../av.mk LOCAL_SRC_FILES := $(FFFILES) LOCAL_C_INCLUDES := $(LOCAL_PATH) $(LOCAL_PATH)/.. LOCAL_CFLAGS += $(FFCFLAGS) LOCAL_CFLAGS += -include "string.h" -Dipv6mr_interface=ipv6mr_ifindex LOCAL_LDLIBS := -lz LOCAL_STATIC_LIBRARIES := $(FFLIBS) LOCAL_MODULE := $(FFNAME) include $(BUILD_STATIC_LIBRARY) libavcodec/Android.mk LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) include $(LOCAL_PATH)/../av.mk LOCAL_SRC_FILES := $(FFFILES) LOCAL_C_INCLUDES := $(LOCAL_PATH) $(LOCAL_PATH)/.. LOCAL_CFLAGS += $(FFCFLAGS) LOCAL_LDLIBS := -lz LOCAL_STATIC_LIBRARIES := $(FFLIBS) LOCAL_MODULE := $(FFNAME) include $(BUILD_STATIC_LIBRARY) libavfilter、libavutil、libpostproc和libswscale下的Android.mk内容如下 LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) include $(LOCAL_PATH)/../av.mk LOCAL_SRC_FILES := $(FFFILES) LOCAL_C_INCLUDES := $(LOCAL_PATH) $(LOCAL_PATH)/.. LOCAL_CFLAGS += $(FFCFLAGS) LOCAL_STATIC_LIBRARIES := $(FFLIBS) LOCAL_MODULE := $(FFNAME) include $(BUILD_STATIC_LIBRARY) 最外层的jni/Android.mk和jni/ffmpeg/Android.mk我只是随便这样写的，你应该根据自己的需求改写。

最后运行ndk-build，经过漫长的等待就编译完成了。

至于具体怎么应用可能以后会写，我变得太懒了。

。

。

转载，仅供参考，祝你愉快，满意请采纳。

需要一个编译多个c文件的makefile

# $Id: Makefile,v 2.0 2008/10/08 18:55:40 Update $ prog_name = TEST #目标文件名 ###################################### # # Generic makefile # # by Jackie Xie # email: jackie.CPlusPlus@ # # Copyright (c) 2008 Jackie Xie # All rights reserved. # # No warranty, no liability; # you use this at your own risk. # # You are free to modify and # distribute this without giving # credit to the original author. # ###################################### ### Customising # # Adjust the following if necessary; EXECUTABLE is the target # executable"s filename, and LIBS is a list of libraries to link in # (e.g. alleg, stdcx, iostr, etc). You can override these on make"s #mand line of course, if you prefer to do it that way. # EXECUTABLE := $(prog_name) LIBS := #库文件 没有可不写 # Now alter any implicit rules" variables if you like, e.g.: # CFLAGS := -g -Wall -O CXXFLAGS := $(CFLAGS) CC := #编译器 # The next bit checks to see whether rm is in your djgpp bin # directory; if not it uses del instead, but this can cause (harmless) # `File not found" error messages. If you are not using DOS at all, # set the variable to something which will unquestioningly remove # files. # ifneq ($(wildcard $(DJDIR)/bin/rm),) RM-F := rm -f else RM-F := del endif # You shouldn"t need to change anything below this point. # # ................... SOURCE := $(wildcard *.cpp) $(wildcard *.c) OBJS := $(patsubst %.cpp,%.o,$(patsubst %.c,%.o,$(SOURCE))) DEPS := $(patsubst %.o,%.d,$(OBJS)) MISSING_DEPS := $(filter-out $(wildcard $(DEPS)),$(DEPS)) MISSING_DEPS_SOURCES := $(wildcard $(patsubst %.d,%.cpp,$(MISSING_DEPS)) $(patsubst %.d,%.cpp,$(MISSING_DEPS))) CPPFLAGS += -MD .PHONY : everything deps objs clean veryclean rebuild everything : $(EXECUTABLE) deps : $(DEPS) objs : $(OBJS) clean : @$(RM-F) *.o @$(RM-F) *.d veryclean: clean @$(RM-F) $(EXECUTABLE) @$(RM-F) *.*~ *~ distclean: veryclean rebuild: veryclean everything ifneq ($(MISSING_DEPS),) $(MISSING_DEPS) : @$(RM-F) $(patsubst %.d,%.o,$@) endif -include $(DEPS) $(EXECUTABLE) : $(OBJS) $(CC) -o $(EXECUTABLE) $(OBJS) $(addprefix ,$(LIBS))

复制，保存为makefile 文件即可。