title: android build platform replace x86_64 to i686
body: <p>I want to build android project source, and when I using below commands, it says the binary can't executed. I found the gcc binary is x86_64 platform, my laptop is i686 platform</p>
  
  <pre><code>adan@adan-Latitude-D630:~/androidsource$ source build/envsetup.sh
  adan@adan-Latitude-D630:~/androidsource$ lunch full_eng
  /bin/bash: prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.6/bin/arm-linux-androideabi-gcc: cannot execute binary file
  /bin/bash: prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.6/bin/arm-linux-androideabi-gcc: cannot execute binary file
   Enter a password: ^C
  adan@adan-Latitude-D630:~/androidsource$ file prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.6/bin/arm-linux-androideabi-gcc
  prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.6/bin/arm-linux-androideabi-gcc: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, BuildID[sha1]=0xf8e11f40cf6b10fa26e6fea774d9d94058c53595, stripped
  </code></pre>
  
  <p>I found my platform is:</p>
  
  <pre><code>adan@adan-Latitude-D630:~$ uname -a
  Linux adan-Latitude-D630 3.8.0-35-generic #50-Ubuntu SMP Tue Dec 3 01:25:33 UTC 2013 i686 i686 i686 GNU/Linux
  </code></pre>
  
  <p>I want to replace the build binary with i686 platform,  how to do this?
  any infomation and link is welcome
  thanks </p>