Setup your build for multiple architectures output directories
mv out out32
mkdir out64
ln -s out64 out
Re-run gyp to get 64 bit make files:
./tools/gyp/gyp -f make build/all.gyp -Dtarget_arch=x64
* If you’re building with gcc 4.4, you need to add -Dno_strict_aliasing=1 and -Dgcc_version=44 to the gyp line.
Build:
make -r -j6 chrome