Install gcc-4.6.0 on ubuntu 10.10

#download gcc-4.6.0.tar.bz2

#download gmp-4.3.2.tar.bz2 mpfr-2.4.2.tar.bz2 mpc-0.8.1.tar.gz

Step 0:
$sudo apt-get install build-essential
$sudo apt-get install m4
$sudo apt-get install zlibc
$sudo apt-get install zlib1g-dev

Step 1: install gmp-4.3.2
#cd to src_dir
$./configure --prefix=/usr/local/gmp-4.3.2
$make
$sudo make install

如果系统提示缺少m4: gmp configure: error: No usable m4 in $PATH or /usr/5bin。m4是一个宏处理器。

　　在网上查了一下这个问题的解决办法，输入以下命令进行安装：

　　sudo aptitude install build-essential m4

Step 2: install mpfr-2.4.2
#cd to src_dir
$./configure --prefix=/usr/local/mpfr-2.4.2 --with-gmp=/usr/local/gmp-4.3.2
$make
$sudo make install

Step 3: install mpc-0.8.1
#cd to src_dir
$./configure --prefix=/usr/local/mpc-0.8.1 --with-gmp=/usr/local/gmp-4.3.2 --with-mpfr=/usr/local/mpfr-2.4.2
$make
$sudo make install

Step 4: install gcc-4.6.0
$export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/mpc-0.8.1/lib:/usr/local/gmp-4.3.2/lib:/usr/local/mpfr-2.4.2/lib
#cd to src_dir
$./configure --prefix=/usr/local/gcc-4.6.0 --enable-threads=posix --disable-checking --disable-multilib --enable-languages=c,c++ --with-gmp=/usr/local/gmp-4.3.2 --with-mpfr=/usr/local/mpfr-2.4.2 --with-mpc=/usr/local/mpc-0.8.1
$make
$sudo make install

Step 5:
$cd /usr/bin
$sudo rm gcc
$sudo rm g++
$sudo ln -s /usr/local/gcc-4.6.0/bin/gcc gcc
$sudo ln -s /usr/local/gcc-4.6.0/bin/g++ g++

Step 6:
$vi ~/.bashrc
#add two statements as follow
    alias gcc='gcc -std=c++0x'
    alias g++='g++ -std=c++0x'

Step 7: enjoy gcc-4.6.0

/************************* Posted on 2011-8-12 *************************/

From 

Step 0:
$sudo apt-get install mpc libmpc-dev libmpfr-dev libppl0.10-dev libcloog-ppl-dev zlib1g zlib1g-dev libc6-dev m4 flex

Step 1:

$wget
#general and easy installation

Step 2:
$mkdir -p ~/gcc/build
#download to ~/gcc/gcc-4.6.tar.bz2
$cd ~/gcc
$tar jxf gcc-4.6.tar.bz2 && mv gcc-4.6* gcc-4.6
$cd build
$../gcc-4.6/configure \

--disable-checking \
--enable-languages=c,c++ \
--enable-multiarch \
--enable-shared \
--enable-threads=posix \
--program-suffix=-4.6 \
--with-gmp=/usr/local/lib \
--with-mpc=/usr/lib \
--with-mpfr=/usr/lib \
--without-included-gettext \
--with-system-zlib \
--with-tune=generic
$sudo make && sudo make install

Step 3:

$sudo ln -sf /usr/local/bin/gcc-4.6 /usr/bin/gcc
$sudo ln -sf /usr/local/bin/g++-4.6 /usr/bin/g++
#add next 2 lines to ~/.bashrc

alias gcc='gcc -std=c++0x'
alias g++='g++ -std=c++0x'