Odyssey

可以先用

> brew info gcc49, 

看看是否有安裝過, 如果沒有, 可以執行以下兩行

> brew tap homebrew/versions

> brew install -enable-cxx -enable-fortran gcc49

如果想自行手動安裝, 可以 :  

1. 下載 gcc 

http://gcc.gnu.org/

2. 解開壓縮檔

> tar jxvf gcc-4.9-20131124.tar.bz2

3. 前期準備

> brew tap homebrew/versions

> brew install gmp

> brew install mpfr 

> brew install libmpc

> brew install isl

> brew install clo

> brew install cloog

4.  shell script

#!/bin/bash

VERSION=4.9.0

PREFIX=/usr/local/Cellar/gcc49

LANGUAGES=c,c++,fortran,java,objc,obj-c++

MAKE="make -j2" 

brew-path() { brew info $1 | head -n3 | tail -n1 | cut -d ' ' -f 1; }

mkdir build

cd build

../configure \

    -build=x86_64-apple-darwin13.0.0 \

    -prefix=$PREFIX \

    -with-gmp=$(brew-path gmp) \

    -with-mpfr=$(brew-path mpfr) \

    -with-mpc=$(brew-path libmpc) \

    -enable-languages=$LANGUAGES \

    -enable-shared \

    -enable-threads=posix \

    -with-system-zlib \

    -enable-stage1-checking \

    -enable-plugin \

    -enable-lto \

    -disable-multilib

5. compile 

> make bootstrap

> make install

6. Install

在 /usr/bin/ 建立新link

   > sudo ln -s /usr/local/bin/gcc-4.9 /usr/bin/gcc

   > sudo ln -s /usr/local/bin/g++-4.9 /usr/bin/g++

ref: http://www.leexiang.com/install-gcc-on-mac

====

compile error

(1) 

ctype_members.cc:132:3: error: redefinition of ‘bool std::ctype<wchar_t>::do_is(std::ctype_base::mask, std::ctype<wchar_t>::char_type) const’

   ctype<wchar_t>::

   ^

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37059

方法: 拿掉 configure 參數:  -enable-clocale=gnu , 刪掉 build 重做