GDC Cross-Compiler

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Difficulty level
Beginner

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

Contents 1 Introduction 1.1 Requirements 2 Step 1 - Bootstrap 2.1 Preparation 2.2 binutils 2.3 gcc 3 Step 2 -

Introduction

If you reached here, you should have enough knowledge about cross-compilers, how they work etc... Or if you don't, go check out our GCC Cross-Compiler article.

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

If you plan to use GCC 4.3.0 or a later version, 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)
    • Tutorial covering MSYS and MinGW builds of GMP
  • GNU MPFR (libmpfr-devel on Cygwin, libmpfr-dev on apt-based systems, dev-libs/mpfr on Gentoo)

If you plan to use GCC 4.5.0 or a later version, you will also have to install the following (using your system's package management):

• • 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 http://ftp.gnu.org/gnu/. Make sure you downloaded exactly GCC ver 4.1.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 http://dgcc.sourceforge.net. 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". (Wilkie told me not to set it to NULL, it will make the compiler to segfault)

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 -

TO BE CONTINUED...