centos7 升級gcc 7.2
1、gcc安裝包獲取
gcc-7.2 版本下載地址：http://gcc.parentingamerica.com/releases/gcc-7.2.0/gcc-7.2.0.tar.gz
2、安裝依賴包
isl-0.16.1.tar.bz2
gmp-6.1.0.tar.bz2
mpfr-3.1.4.tar.bz2
mpc-1.0.3.tar.bz2
依賴包下載地址：ftp://gcc.gnu.org/pub/gcc/infrastructure/
安裝 isl-0.16.1.tar.bz2
tar -jzvf isl-0.16.1.tar.bz2
cd isl-0.16.1
./configure
make
make install
安裝 gmp-6.1.0.tar.bz2
tar -jxvf gmp-6.1.0.tar.bz2
cd gmp-6.1.0
mkdir temp
cd temp
../configure --prefix=/usr/local/gmp-6.1.0
make
make install
安裝 mpfr-3.1.4.tar.bz2
tar -jxvf mpfr-3.1.4.tar.bz2
cd mpfr-3.1.4
mkdir temp
cd temp
../configure --prefix=/usr/local/mpfr-3.1.4 --with-gmp=/usr/local/gmp-6.1.0
make
make install
安裝 mpc-1.0.3.tar.bz2
tar -jxvf mpc-1.0.3.tar.bz2
cd mpc-1.0.3
mkdir temp
cd temp
../configure --prefix=/usr/local/mpc-1.0.3 --with-mpfr=/usr/local/mpfr-3.1.4 --with-gmp=/usr/local/gmp-6.1.0
make
make install
依賴安裝完成，配置依賴引數
vim /etc/profile
在檔案尾新增：
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/mpc-1.0.3/lib:/usr/local/gmp-6.1.0/lib:/usr/local/mpfr-3.1.4/lib
確保路徑與實際安裝路徑一致。
執行：
source /etc/profile
3、安裝gcc
tar -zxvf gcc-7.2.0.tar.gz
cd gcc-7.2.0
mkdir gcc-7.2-build
cd gcc-7.2-build
../configure --prefix=/usr/gcc-7.2.0 --disable-multilib --enable-languages=c,c++ --with-gmp=/usr/local/gmp-6.1.0 --with-mpfr=/usr/local/mpfr-3.1.4 --with-mpc=/usr/local/mpc-1.0.3
make
make install
安裝完成，init 6 重啟
4、配置gcc
使用新版gcc、g++ 替換老版本
mv /usr/bin/gcc /usr/bin/gcc.bak
ln -s /usr/gcc-7.2.0/bin/gcc /usr/bin/gcc
mv /usr/bin/g++ /usr/bin/g++.bak
ln -s /usr/gcc-7.2.0/bin/g++ /usr/bin/g++
update-alternatives --install /usr/bin/cc cc /usr/gcc-7.2.0/bin/gcc 999
更新動態庫
cp gcc-7.2.0/output/stage1-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.6.0.24 /usr/gcc-7.2.0/lib64/libstdc++.so.6.0.24
rm -rf libstdc++.so.6
ls -s libstdc++.so.6.0.24 libstdc++.so.6
echo '/usr/local/lib/' > /etc/ld.so.conf.d/local-lib64.conf
ldconfig -v
5、安裝完成
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/gcc-7.2.0/libexec/gcc/x86_64-pc-linux-gnu/7.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --prefix=/usr/gcc-7.2.0 --disable-multilib --enable-languages=c,c++ --with-gmp=/usr/local/gmp-6.1.0 --with-mpfr=/usr/local/mpfr-3.1.4 --with-mpc=/usr/local/mpc-1.0.3
Thread model: posix
gcc version 7.2.0 (GCC)