GDC Cross-Compiler

This page or section is a work in progress and may thus be incomplete. Its content may be changed in the near future.

If you reached here, you should have enough knowledge about cross-compilers, how they work. and so on. If you don't, check out GCC Cross-Compiler.

Requirements

We assume you have a host system with a working GCC installation. If you are not using a bash shell, you might have to modify some of the command lines below. If you have just installed the basic Cygwin package, you have to run the setup.exe again and install the following packages:

• GCC
• Make
• Flex
• Bison

You will also have to install the following (using your system's package management):

GNU GMP (libgmp-devel on Cygwin, libgmp3-dev on apt-based systems, dev-libs/gmp on Gentoo)

GNU MPFR (libmpfr-devel on Cygwin, libmpfr-dev on apt-based systems, dev-libs/mpfr on Gentoo)

MPC (libmpc-devel on Cygwin, libmpc-dev on apt-based systems, dev-libs/mpc on Gentoo)

Step 1 - Bootstrap

We will build a toolset running on your host that can turn source code into object files for your target system.

We need the binutils and the GCC packages from [1]. Make sure you downloaded exactly GCC ver 4.9.x (or 3.x, if you like old stuffs). Download them to /usr/src (or whereever you think appropriate), and unpack them. Also, we need gdc package from [2]. Current version is 0.24.

Preparation

  export PREFIX=/usr/local/cross
  export TARGET=i586-elf
  cd /usr/src
  mkdir build build/binutils build/gcc

binutils

  cd /usr/src/build/binutils
  /usr/src/binutils-x.xx/configure --target=$TARGET --prefix=$PREFIX --disable-nls
  make all
  make install

gcc

This needs some work out. First, unpack gcc, and we got /usr/src/gcc-x.x.x Go to /usr/src/gcc-x.x.x/gcc, and unpack gdc.This will create a subdirectory named "d".

  cd /usr/src/gcc-x.x.x
  ./gcc/d/setup-gcc.sh

Then go to /usr/src/gcc-x.x.x/gcc/d, open d-lang.cc and look at line 188. You'll see this

 const char* cygwin_d_os_versym = D_OS_VERSYM;

Change D_OS_VERSYM to whatever you want, since it is a string, like "MyOS". But do not set it to NULL, or your compiler will segfault. Forum Post by Wilkie

Now, you can build GCC:

  cd /usr/src/build-gcc
  export PATH=$PATH:$PREFIX/bin
  ../gcc-x.x.x/configure --target=$TARGET --prefix=$PREFIX --disable-nls \
      --enable-languages=c,d,c++ --without-headers
  make all-gcc
  make install-gcc

Step 2

Before you can build a kernel, you must have a kind of D Runtime. At least you must have a correct object.d file.

TO BE CONTINUED...