CentOS上GCC 升级到6.3.0的方法，centos6.3.0


虚拟机环境信息：

[root@localhost /]# cat /etc/redhat-release

CentOS Linux release 7.3.1611 (Core)

[root@localhost /]# cat /proc/version

Linux version 3.10.0-514.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC) ) #1 SMP Tue Nov 22 16:42:41 UTC 2016

可以看出gcc版本为4.8.5

GCC依赖于gmp4.2+,mpfr2.4+和mpc0.8+，这里直接下载安装最新的版本。

安装gmp6.1.2

tarxvfgmp-6.1.2.tar.xz

cdgmp-6.1.2

./configure--prefix=/usr/local/gmp

make-j20&&makeinstall

(执行./configure--prefix=/usr/local/gmp时会出现错误configure: error: could not find a working compiler。直接yum remove gcc 卸载然后 yum install gcc 重新安装再执行上述操作)

安装mpfr3.1.5mpfr依赖于gmp

tarxvfmpfr-3.1.5.tar.gz

cdmpfr-3.1.5

./configure--prefix=/usr/local/mpfr--with-gmp=/usr/local/gmp

make-j20&&makeinstall

安装mpc1.0.3mpc依赖于gmp和mpfr

tarxvfmpc-1.0.3.tar.gz

cdmpc-1.0.3

./configure--prefix=/usr/local/mpc--with-gmp=/usr/local/gmp-with-mpfr=/usr/local/mpfr

make-j20&&makeinstall

安装GCC6.3.0

tarxvfgcc-6.3.0.tar.gz

cdgcc-6.3.0

./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

make-j20&&makeinstall

安装过程中可能会出现：

“checkingforsuffixofobjectfiles...configure:error:cannotcomputesuffixofobjectfiles:cannotcompile

See`config.log'formoredetails.

make[2]:***[configure-stage1-target-libgcc]Error1

make[2]:Leavingdirectory`/tmp/gcc-6.3.0'

make[1]:***[stage1-bubble]Error2

make[1]:Leavingdirectory`/tmp/gcc-6.3.0'

make:***[bootstrap]Error2

解决方法：

yuminstallm4

yuminstallgcc-c++

实际解决办法：编辑变量，把我们安装的gmp,mpfr,mpc加进去

vi/etc/ld.so.conf

添加部分：

/usr/local/lib#这个是默认系统的变量

/usr/local/gmp/lib

/usr/local/mpfr/lib

/usr/local/mpc/lib

添加保存后记得更新动态库的缓存：

ldconfig-v

更新后再去重新编译安装。

备份系统默认的gcc版本

mv/usr/bin/gcc/usr/bin/gcc-bak

mv/usr/bin/g++/usr/bin/g++-bak

mv/usr/bin/c++/usr/bin/c++-bak

创建新的gcc软连接

ln-sf/usr/local/gcc/bin/gcc/usr/bin/gcc

ln-sf/usr/local/gcc/bin/c++/usr/bin/c++

ln-sf/usr/local/gcc/bin/g++/usr/bin/g++

ln-sf/usr/local/gcc/lib64/libstdc++.so.6.0.22/usr/lib64/libstdc++.so.6

查看gcc版本：

[root@localhost ~]# gcc --version

gcc (GCC) 6.3.0

Copyright (C) 2016 Free Software Foundation, Inc.

This is free software; see the source for copying conditions. There is NO

warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

或者

[root@localhost ~]# gcc -v

Using built-in specs.

COLLECT_GCC=gcc

COLLECT_LTO_WRAPPER=/usr/local/gcc/libexec/gcc/x86_64-pc-linux-gnu/6.3.0/lto-wrapper

Target: x86_64-pc-linux-gnu

Configured with: ./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

Thread model: posix

gcc version 6.3.0 (GCC)

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