openwrt开发-降低gcc版本

• 时间：2017年11月17日13:44:44
• 作者：Kali
• 邮箱：cyysu.github.io@gmail.com/2869905223@qq.com/微信lwyx1413
• 版本：4.0
• 描述：将PC端的gcc5.4降低至gcc4.6，来编译HIWIFI的源码

路由器开发

编译过程

1、下载依赖，在源码目录下执行如下操作： 
./contrib/download_prerequisites
2、编译gmp，这个在我们上面步骤执行完这个包就在我们的目录
[root@master gmp-4.3.2]# ./configure --prefix=/usr/local/gmp
[root@master gmp-4.3.2]# make && sudo make install
3、编译mpfr
[root@master ~]# tar -jxf mpfr-2.4.2.tar.bz2
[root@master ~]# cd mpfr-2.4.2
[root@master mpfr-2.4.2]# ./configure --prefix=/usr/local/mpfr -with-gmp=/usr/local/gmp
[root@master mpfr-2.4.2]# make && sudo make install
4、编译mpc
[root@master ~]# tar -zxvf mpc-0.8.1.tar.gz
[root@master ~]# cd mpc-0.8.1
[root@master mpc-0.8.1]# ./configure --prefix=/usr/local/mpc -with-mpfr=/usr/local/mpfr -with-gmp=/usr/local/gmp
[root@master mpc-0.8.1]# make && sudo make install
5、编译gcc-4.6
[root@master ~]# tar -jxf gcc-4.6.1.tar.bz2
[root@master  ~]# cd gcc-4.6.1
[root@master gcc-4.6.1]# ./configure --prefix=/usr/local/gcc --enable-threads=posix --disable-checking --disable-multilib --enable-languages=c,c++ --with-gmp=/usr/local/gmp --with-mpfr=/usr/local/mpfr/ --with-mpc=/usr/local/mpc/
# 设置动态库
[root@master gcc-4.6.1]# export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/mpc/lib:/usr/local/gmp/lib:/usr/local/mpfr/lib/
[root@master gcc-4.6.1]# make && sudo make install
make[4]: Leaving directory `/root/gcc-4.6.1/x86_64-unknown-linux-gnu/libgomp'
make[3]: Leaving directory `/root/gcc-4.6.1/x86_64-unknown-linux-gnu/libgomp'
make[2]: Leaving directory `/root/gcc-4.6.1/x86_64-unknown-linux-gnu/libgomp'
make[1]: Leaving directory `/root/gcc-4.6.1'
6、建立新链接
[root@master gcc-4.6.1]# sudo mkdir -p /usr/bin/gcc_backup/
[root@master gcc-4.6.1]# sudo mv /usr/bin/{gcc,g++} /usr/bin/gcc_backup/
[root@master gcc-4.6.1]# sudo ln -s /usr/local/gcc/bin/gcc /usr/bin/gcc
[root@master gcc-4.6.1]# sudo ln -s /usr/local/gcc/bin/g++ /usr/bin/g++

问题解决方案

make[4]: Entering directory '/home/mj/gcc-4.6.4/x86_64-unknown-linux-gnu/libstdc++-v3/po'
msgfmt -o de.mo ../../.././libstdc++-v3/po/de.po
msgfmt: /home/mj/gcc-4.6.4/x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.6: version `CXXABI_1.3.8' not found (required by /usr/lib/x86_64-linux-gnu/libicuuc.so.55)
Makefile:451: recipe for target 'de.mo' failed
make[4]: *** [de.mo] Error 1
make[4]: Leaving directory '/home/mj/gcc-4.6.4/x86_64-unknown-linux-gnu/libstdc++-v3/po'
Makefile:469: recipe for target 'all-recursive' failed
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory '/home/mj/gcc-4.6.4/x86_64-unknown-linux-gnu/libstdc++-v3'
Makefile:377: recipe for target 'all' failed
make[2]: *** [all] Error 2
make[2]: Leaving directory '/home/mj/gcc-4.6.4/x86_64-unknown-linux-gnu/libstdc++-v3'
Makefile:14812: recipe for target 'all-target-libstdc++-v3' failed
make[1]: *** [all-target-libstdc++-v3] Error 2
make[1]: Leaving directory '/home/mj/gcc-4.6.4'
Makefile:892: recipe for target 'all' failed
make: *** [all] Error 2
mj@DZ:~/gcc-4.6.4$ str
strace      stream      stream-im6  strings     strip       
# 查看系统上的文件确实不存在，那么我们看一下我们系统中是否存在
mj@DZ:~/gcc-4.6.4$ strings /home/mj/gcc-4.6.4/x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.6 | grep CXXABI
CXXABI_1.3
CXXABI_1.3.1
CXXABI_1.3.2
CXXABI_1.3.3
CXXABI_1.3.4
CXXABI_1.3.5
CXXABI_1.3
CXXABI_1.3.2
CXXABI_1.3.1
CXXABI_1.3.5
CXXABI_1.3.4
CXXABI_1.3.3
# 查看系统文件
mj@DZ:~/gcc-4.6.4$ strings /usr/lib/x86_64-linux-gnu/libstdc++.so.6 | grep CXXABI
CXXABI_1.3
CXXABI_1.3.1
CXXABI_1.3.2
CXXABI_1.3.3
CXXABI_1.3.4
CXXABI_1.3.5
CXXABI_1.3.6
CXXABI_1.3.7
CXXABI_1.3.8
CXXABI_1.3.9
CXXABI_TM_1
CXXABI_FLOAT128
# 发现存在，那么这个时候的解决方案如下
ln -sf /usr/lib/x86_64-linux-gnu/libstdc++.so.6 /home/mj/gcc-4.6.4/x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.6

初始gcc版本

# 之前的gcc版本
mj@DZ:~$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 5.4.0-6ubuntu1~16.04.5' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-5 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.5) 

新安装gcc版本

mj@DZ:~/gcc-4.6.4$ gcc -v
使用内建 specs。
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/gcc/libexec/gcc/x86_64-unknown-linux-gnu/4.6.4/lto-wrapper
目标：x86_64-unknown-linux-gnu
配置为：./configure --prefix=/usr/local/gcc --enable-threads=posix --disable-checking --disable-multilib --enable-languages=c,c++ --with-gmp=/usr/local/gmp --with-mpfr=/usr/local/mpfr/ --with-mpc=/usr/local/mpc/
线程模型：posix
gcc 版本 4.6.4 (GCC) 

大功告成，总结一下自己的经历就是遇见error不要怕，要勇敢面对，要感谢error，正是这些error教会我们成长。祝大家移植成功。

结束语

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