Jthread1.3.1 Jrtplib3.9.1跨平台交叉编译之Android（一）

折腾two days终于编译OK，主要参考http://blog.csdn.net/nickwar/article/details/9133399 https://github.com/jimjh/JRTPLib-for-Android，资源且少，越发珍贵，做一记录。

1.平台

win7 ndk-r8d cmake2.8   msys1.0

cmake用法百度

2.下载源码解压

！！！.注意目录和子目录均有CmakeLIst，两文件内容不同，位置不要乱动。

先说Jthread编译，src目录下有源码和头文件(编译时遇到最多的错误就是找不见头文件，或者头文件顺序不当引起的诡异error)

在jthread目录下：

1 打开CmakeList文件

注释这些，其实不注释也可以，暂且这么做

# find_package(Threads)
# if (NOT CMAKE_USE_WIN32_THREADS_INIT)
# 	if (NOT CMAKE_USE_PTHREADS_INIT)
# 		message(FATAL_ERROR "Can find neither pthread support nor Win32 thread support")
# 	endif (NOT CMAKE_USE_PTHREADS_INIT)
# endif (NOT CMAKE_USE_WIN32_THREADS_INIT)

2 在jthread下新建一个android-build目录以放置生成好的库及头文件

3 src/pthread/jthread.cpp的125行，找到pthread_cancel(threadid);并注释之，替换成 pthread_kill(threadid, SIGUSR1); 原因么，是因为android用的自家产的Bionic libc而不是标准glibc，具体可wikipedia之。

4，最重要的android.sh,就在jthread的下创建

<span style="color:#222222;">#!/bin/sh
# Written by Nxf <[email protected]>
# 
# Builds the JThread library for Android
export NDK_ROOT="D:/android-ndk-r8d-windows/android-ndk-r8d"     </span><span style="color:#ff0000;">改成自己路径</span><span style="color:#222222;">
export PATH="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/:${PATH}"
SYS_ROOT="${NDK_ROOT}/platforms/android-14/arch-arm"
PREF="arm-linux-androideabi-"

OUT_DIR="D:/sh/jthread/android-build"   
C_FLAGS="-lstdc++ -lsupc++ \
        -I${NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.4.3/include \
        -I${NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.4.3/libs/armeabi/include \
        -L${NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.4.3/libs/armeabi"

#set -e

export CC="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}gcc  --sysroot=${SYS_ROOT}"
export CXX="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}g++  --sysroot=${SYS_ROOT}"
export LD="$${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/{PREF}ld  --sysroot=${SYS_ROOT}"
export CPP="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}cpp  --sysroot=${SYS_ROOT}"
export AS="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}as"
export OBJCOPY="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}objcopy"
export OBJDUMP="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}objdump"
export STRIP="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}strip"
export RANLIB="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}ranlib"
export CCLD="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}gcc  --sysroot=${SYS_ROOT}"
export AR="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}ar"

cmake	\
		-DCMAKE_SYSTEM_NAME="Generic" \
        -DCMAKE_CXX_FLAGS="${C_FLAGS}"\
		-DCMAKE_FIND_ROOT_PATH="${SYS_ROOT}" \
		-DCMAKE_INSTALL_PREFIX="${OUT_DIR}" \
		-G "MSYS Makefiles" .
		
		

/D/android-ndk-r8d-windows/android-ndk-r8d/prebuilt/windows/bin/make.exe   </span><span style="color: rgb(34, 34, 34); font-family: SimSun;"> </span><span style="font-family: SimSun; color: rgb(255, 0, 0);">改成自己路径</span><span style="color:#222222;">

/D/android-ndk-r8d-windows/android-ndk-r8d/prebuilt/windows/bin/make.exe install


cd ${OUT_DIR}/lib && \
${AR} -x libjthread.a && \
${CXX} ${C_FLAGS} -shared -Wl,-soname,libjthread.so -o libjthread.so  *.obj && \
rm *.obj

exit 0</span>

5.在msys中，cd的当前路径，运行./android.sh 

libjthread.a 和.so文件生成，还算比较顺利。

下面开始jrtplib

步骤基本同前，知识改文件稍多

1.修改Cmakelist，传输中的大小端问题，也可以不该，为什么？细心的读者会发现有个 rtpconfig.h.in，此非头文件，内容却像，稍后再说。

if (CMAKE_CROSSCOMPILING)
	# option (JRTPLIB_USE_BIGENDIAN "Target platform is big endian" ON)
	# if (JRTPLIB_USE_BIGENDIAN)
		# set(RTP_ENDIAN "#define RTP_BIG_ENDIAN")
	# else (JRTPLIB_USE_BIGENDIAN)
		set(RTP_ENDIAN "// Little endian system")
	# endif (JRTPLIB_USE_BIGENDIAN)
else (CMAKE_CROSSCOMPILING)
	# test_big_endian(JRTPLIB_BIGENDIAN)
	# if (JRTPLIB_BIGENDIAN)
		# set(RTP_ENDIAN "#define RTP_BIG_ENDIAN")
	# else (JRTPLIB_BIGENDIAN)
		set(RTP_ENDIAN "// Little endian system")
	# endif (JRTPLIB_BIGENDIAN)
endif (CMAKE_CROSSCOMPILING)

2.android.sh

#!/bin/sh
# 
# Builds the JThread library for Android
export NDK_ROOT="D:/android-ndk-r8d-windows/android-ndk-r8d"
export PATH="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/:${PATH}"
SYS_ROOT="${NDK_ROOT}/platforms/android-14/arch-arm"
PREF="arm-linux-androideabi-"

J="D:/rtp/jthread/src"
OUT_DIR="D:/rtp/jrtplib/android-build"

#C_FLAGS="-lstdc++ -lsupc++ \
#        -I${NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.4.3/include \
#        -I${NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.4.3/libs/armeabi/include \
#        -L${NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.4.3/libs/armeabi"
#        -L${J} "
C_FLAGS="-lstdc++ -lsupc++ \ <span style="color:#ff0000;">原作上面两个参数去掉，编译不碍</span>
        -I${NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.4.3/include \
        -I${NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.4.3/libs/armeabi/include \
        -L${NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.4.3/libs/armeabi \
		-L${J}"



#set -e

export CC="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}gcc  --sysroot=${SYS_ROOT}"
export CXX="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}g++  --sysroot=${SYS_ROOT}"
export LD="$${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/{PREF}ld  --sysroot=${SYS_ROOT}"
export CPP="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}cpp  --sysroot=${SYS_ROOT}"
export AS="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}as"
export OBJCOPY="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}objcopy"
export OBJDUMP="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}objdump"
export STRIP="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}strip"
export RANLIB="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}ranlib"
export CCLD="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}gcc  --sysroot=${SYS_ROOT}"
export AR="${NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/${PREF}ar"

cmake	\
		-DCMAKE_SYSTEM_NAME="Generic" \
        -DCMAKE_CXX_FLAGS="${C_FLAGS}"\
		-DCMAKE_FIND_ROOT_PATH="${SYS_ROOT}" \
		-DJTHREAD_INCLUDE_DIRS="${J}" \<span style="color:#ff0000;">    改这行及下面</span>
        -DJTHREAD_LIBRARIES="${J}" \
        -DCMAKE_PREFIX_PATH="D:/rtp/jthread/android-build" \
		-DCMAKE_INSTALL_PREFIX="${OUT_DIR}" \
		-G "MSYS Makefiles" .
		
		

/D/android-ndk-r8d-windows/android-ndk-r8d/prebuilt/windows/bin/make.exe
/D/android-ndk-r8d-windows/android-ndk-r8d/prebuilt/windows/bin/make.exe install

cd ${OUT_DIR}/lib && \
# ${AR} -x libjthread.a && \
# ${CXX} ${C_FLAGS} -shared -Wl,-soname,libjthread.so -o libjthread.so  *.obj && \
${AR} -x libjrtplib.a && \
${CXX} ${C_FLAGS} -shared -Wl,-soname,libjrtplib.so -o libjrtplib.so  *.obj && \
rm *.obj

exit 0

这玩意非常重要，里面路径写错，编译出错，可能又去改代码，改了后关联文件继续报错，所以自习，上面是我的软件安装目录！

3.头文件有误了自己改改路径都能解决，add_subdirectory(examples) 错误，注释即可

android项目即可使用，之前没用过msys,所以还想尝试了下windown 下android ndk 编译，下篇讲。