76 lines
2.3 KiB
Markdown
76 lines
2.3 KiB
Markdown
layout: post
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title: "Cross compiler"
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subtitle: "Setting up under OSX Lion"
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tags: [osdev]
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For simplicity, I chose to set up a so-called cross compiler for osdeving. In
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OSX Lion, this is what I did.
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First of all, I installed Xcode from the Mac App store. Since version 4.3,
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Xcode doesn't install any command line tools anymore, so this had to be done
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manually:
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- Open Xcode
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- Go the Preferences
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- Choose Downloads
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- Find Command Line Tools and click Install.
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This is better than some earlier versions, though, which use a buggy
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c-compiler. An update was required on one of my computers.
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Compiling gcc also requires the mpfr package to be installed. This I did with
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[Homebrew](http://mxcl.github.com/homebrew/).
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brew install mpfr
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{: .prettyprint}
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I downloaded all the sources I needed from [gnu.org](http://gnu.org).
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curl -O http://ftp.gnu.org/gnu/binutils/binutils-2.22.tar.gz
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curl -O http://ftp.gnu.org/gnu/gcc/gcc-4.6.3/gcc-core-4.6.3.tar.gz
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curl -O http://ftp.gnu.org/gnu/gmp/gmp-5.0.2.tar.gz
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curl -O http://ftp.gnu.org/gnu/mpfr/mpfr-3.1.0.tar.gz
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curl -O http://www.multiprecision.org/mpc/download/mpc-0.9.tar.gz
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{: .prettyprint .lang-bash}
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Feel free to use later versions, but if you do, I cannot guarantee that the
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code posted in my logs will work for you (it's very likely to work, but not
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*guaranteed*). Gmp, mpfr and mpc are floating point libraries that are used by
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gcc, so after extracting all archives, they are simply copied into the gcc
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source
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mv gmp-5.0.2 gcc-4.6.3/gmp
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mv mpfr-3.1.0 gcc-4.6.3/mpfr
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mv mpc-0.9 gcc-4.6.3/mpc
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{: .prettyprint .lang-sh}
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In order not to mess up the source, binutils and gcc were built out of tree.
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mkdir build-binutils
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cd build-binutils
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export PREFIX=/usr/local/cross
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export TARGET=i386-elf
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../binutils-2.22/configure --target=$TARGET --prefix=$PREFIX --disable-nls
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make all
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make install
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{: .prettyprint .lang-bash}
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And the same for gcc, using the new binutils
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cd ..
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mkdir build-gcc
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cd build-gcc
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export PATH=$PATH:$PREFIX/bin
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../gcc-4.6.3/configure --target=$TARGET --prefix=$PREFIX --disable-nls --enable-languages=c --without-headers
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make all-gcc
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make install-gcc
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{: .prettyprint .lang-bash}
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It's really important to run _make all-gcc_ and _make install-gcc_ and __not__
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_make all_ and _make install_ here. It probably works anyway - if you ever
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manage to get it to actually compile...
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And that's it!
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