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Followed: http://wiki.osdev.org/How_to_develop_on_Mac_OS_X
brew uninstall binutils
lynx ftp://ftp.gnu.org/gnu/binutils/
lynx ftp://ftp.gnu.org/gnu/gcc/
tar zxvf binutils-2.28.tar.gz
tar zxvf gcc-6.3.0.tar.gz
cd gcc-6.3.0
contrib/download_prerequisites
brew install gcc
export CC=/usr/local/bin/gcc-6
export CXX=/usr/local/bin/g++-6
export CPP=/usr/local/bin/cpp-6
export LD=/usr/local/bin/gcc-6
export PREFIX="$HOME/opt/cross"
export TARGET=i486-elf
export PATH="$PREFIX/bin:$PATH"
mkdir src
mv binutils-2.28* src
mv gcc-6.3.0* src
cd src/
mkdir build-binutils
cd build-binutils
../binutils-2.28/configure --target=$TARGET --prefix="$PREFIX" --with-sysroot --disable-nls --disable-werror
make
make install
which -- $TARGET-as || echo $TARGET-as is not in the PATH
mkdir build-gcc
cd build-gcc
../gcc-6.3.0/configure --target=$TARGET --prefix="$PREFIX" --disable-nls --enable-languages=c,c++ --without-headers
make all-gcc
make all-target-libgcc
make install-gcc
make install-target-libgcc
make CC=~/opt/cross/bin/i486-elf-gcc LD=~/opt/cross/bin/i486-elf-ld
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