linux toolchain,Linux Toolchain

Linux Toolchain

Here is a simple way to get started with the Linux open source toolchain for MIPS. This is referred to as target mipsel-linux-gnu. The C library is from egibc.

We provide a prebuilt binary package that you can download and use.

A source package and command file is provided with which you can build your own custom toolchain. This package can also be modified and various components exchanged for newer/older versions.

Components

The toolchain is built with the following components:

If you want to build your own toolchain or, to configure it differently you can follow the instructions on this page. When you build your own toolchain you can also substitute different versions of the above components. All instructions assume the Bash shell.

Using The Pre-Built Toolchain

You can download the prebuilt package, unpack it, set your path to it’s top level bin directory and begin to use it. If you unpack the package to a folder different from “/opt“, you will have to manually point to the sysroot folder using “–sysroot” command line option on each gcc invocation.

1. Download this tar file: Mips_linux_toolchain_bin-1.1.tar.bz2

2. Unpack the tar file to the /opt folder:

cd /opt

tar vfxj Mips_linux_toolchain_bin-1.1.tar.bz2

3. Add the bin folder to the path:

export PATH=/opt/mips_linux_toolchain/bin:$PATH

Running QEMU standalone and with gdb

Build a simple hello world:

mips-linux-gnu-gcc -g hello.c -o hello -static

Run with QEMU:

qemu-mips hello

Run with qemu under the control of gdb

qemu-mips -g 1234 hello &

mips-linux-gnu-gdb hello

target remote :1234

break main

step

step

step

kill

quit

y

Building a Toolchain from Source

Various components must be installed on your computer before proceeding, if they are not already there. http://gcc.gnu.org/install/prerequisites.html

In general you will receive the proper warning if you are missing some component but not always so it’s good to read through the list.

1. Download this tar file: Mips_linux_toolchain_src-1.1.tar.bz2

2. Unpack the tar file:

tar vfxj Mips_toolchain_src-1.1.tar.bz2

3. Run the build script (DIR is a folder where you want to install the toolchain):

./build-mips-sde-elf.sh --prefix=DIR

Build Options

To get a full list of build options run the build script with help command: ./build-mips-linux-gnu.sh help.

Usage: build-mips-linux-gnu.sh [OPTIONS] COMMANDS

COMMANDS

buildall run all building stages from unpack to check

download check packages and download missed ones

cleanup remove source, build and aux dirs

help print this help message

unpack unpack packages

buildgmp build GMP library

buildmpfr build MPFR library

buildmpc build MPC library

buildbinutils build Binutils

buildgcc1 build GCC phase I

installheaders install Linux headers

buildeglibc1 build eglibc headers and preliminary objects

buildgcc2 build GCC phase II

buildeglibc2 build eglibc libraries

buildgcc3 build GCC phase III

buildlibgcc build libgcc

buildexpat build expat

buildgdb build GDB

buildqemu build QEMU

check run set of simple tests

OPTIONS

-h, --help print this help message

-p, --prefix=DIR use DIR as an installation prefix

-d, --download=DIR lookup packages tarballs in the DIR

-s, --source=DIR use DIR to unpack packages tarballs

-b, --build=DIR use DIR as a build directory

-j, --jobs=NUM run NUM make jobs simultaneously

ENVIRONMENT

You can override default packages versions using the following environment

variables. For example 'GMP_VER=5.5.5 build-mips-linux-gnu.sh'.

GMP_VER gmp library version

MPC_VER mpc library version

MPFR_VER mpfr library version

BINUTILS_VER binutils version

GCC_VER gcc version

LINUX_VER linux kernel

EGLIBC_VER eglibc library version

EXPAT_VER expat library version

GDB_VER gdb version

QEMU_VER qemu version

By default, the build script searches packages in the ./dl folder and creates the following auxiliary folders:

./bld/

./install/

./src/

You should point to the installation folder using either –prefix command line option or PREFIX environment variable:

./build-mips-linux-gnu.sh --prefix=DIR

export PREFXI=DIR

./build-mips-linux-gnu.sh

If you want to use different version of components, you can override default settings using environment variables. For example, the following command builds the toolchain using gcc 4.6.1 and gdb 7.3.1:

GCC_VER=4.6.1 \

GDB_VER=7.3.1 \

./build-mips-linux-gnu.sh --prefix=DIR

Default component’s versions are:

GMP_VER=4.3.2

MPC_VER=0.9

MPFR_VER=3.0.1

BINUTILS_VER=2.21

GCC_VER=4.4.6

LINUX_VER=2.6.32.27

EGLIBC_VER=2_14

EXPAT_VER=2.0.1

GDB_VER=7.2

QEMU_VER=0.15.0