linux gcc4.8安装（多个gcc环境）

1.环境：Linux xxx 2.6.18-371.3.1.el5xen #1 SMP Mon Nov 11 03:28:23 EST 2013 x86_64 x86_64 x86_64 GNU/Linux

2.下载

gcc4.8包 gmp包、mpfr包、mpc包(都要安装)

（../configure --prefix=/home/mawanli/work/gcc482 --mandir=/home/mawanli/work/gcc482/man --infodir=/home/mawanli/work/gcc482/info --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-libgcj-multifile --enable-languages=c,c++,objc,obj-c++ --enable-java-awt=gtk --disable-dssi --disable-plugin --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic --build=x86_64-redhat-linux --with-gmp=/home/mawanli/soft/gcc-4.8.2/work/gmpwork/ --with-mpfr=/home/mawanli/soft/gcc-4.8.2/work/mpfrwork/ --with-mpc=/home/mawanli/soft/gcc-4.8.2/work/mpcwork/）

3.安装出现问题

3.1 configure: error: cannot compute suffix of object files: cannot compile

     解决：export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:{$gmppath}/lib:{$mpfrpath}/lib:{$mpcpath}/lib

3.2 x86_64-redhat-linux-ar: Command not found

解决 --host=x86_64-redhat-linux改为--build=x86_64-redhat-linux

3.3 gcc GNAT is required to build ada

解决 configure时--enable-languages=c,c++,（ada去掉）

3.4  configure-fixincludes错误 1

make disclean (不太好使)

把gcc下东西全部删除 重新编译

4. make是用 （make -j 8）快

~/work/gcc482/bin/gcc -v
使用内建 specs。
COLLECT_GCC=/home/mawanli/work/gcc482/bin/gcc
COLLECT_LTO_WRAPPER=/home/mawanli/work/gcc482/libexec/gcc/x86_64-redhat-linux/4.8.2/lto-wrapper
目标：x86_64-redhat-linux
配置为：../configure --prefix=/home/mawanli/work/gcc482 --mandir=/home/mawanli/work/gcc482/man --infodir=/home/mawanli/work/gcc482/info --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-libgcj-multifile --enable-languages=c,c++,objc,obj-c++ --enable-java-awt=gtk --disable-dssi --disable-plugin --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic --build=x86_64-redhat-linux --with-gmp=/home/mawanli/soft/gcc-4.8.2/work/gmpwork/ --with-mpfr=/home/mawanli/soft/gcc-4.8.2/work/mpfrwork/ --with-mpc=/home/mawanli/soft/gcc-4.8.2/work/mpcwork/
线程模型：posix
gcc 版本 4.8.2 (GCC) 

4.1  error while loading shared libraries: libmpc.so.2: cannot open shared object file: No such file or directory

解决：加环境变量里面

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/mawanli/soft/gcc-4.8.2/work/gmpwork/lib:/home/mawanli/soft/gcc-4.8.2/work/mpcwork/lib:/home/mawanli/soft/gcc-4.8.2/work/mpfrwork/lib

总结：这个耗费我大把时间 不过干完之后跑起来真的开心（中途我有放弃不玩了，但是还是做完啦）