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Building a Win32 hosted sh4-crosscompiler using GCC


This page describes for short and specifically, how to built a sh4-crosscompiler that will run in the CygWin environment hosted on win32 (The linux dudes just ignore the Cygnus specific stuff). This example uses a whole lot of default values/paths etc, there may be better ways to do it, but this seemed to have worked for me.

note: the procedure is exactly the same for building the ARM toolchain (for use with the AICA/Sound Coprocessor inside the dc), except you use arm-elf for the target and leave out any sh4 specific switches in any commands.

Preparing CygWin

Get the latest Cygnus GCC distribution here. Lazy People just download this file which will, when run, grab all the tarballs and install CygWin for you. Be SURE to get the most recent version of the whole toolchain, there were certain problems with older versions. (Don't use the b20 thing that came in one big install file once.)

Install CygWin and make sure the environment and everything else (/tmp dir for bash!) is set up right. Try compiling hello.c to be sure.

In order to have quick access to a ready to use unix/linux style environment that CygWin provides, create a batchfile like this:

@ECHO OFF
SET MAKE_MODE=UNIX
SET PATH=C:\GNU\CYGWIN\BIN;%PATH%
SET PATH=C:\GNU\CYGWIN\lib\gcc-lib\i686-pc-cygwin\2.95.2;%PATH%
SET PATH=C:\GNU\CYGWIN\USR\LOCAL\BIN;%PATH%
BASH

Now run this batchfile, and check your mountpoints.

$ mount

The output should look like this:

Device                     Directory   Type    Flags
C:\GNU\CYGWIN\USR\INCLUDE  /include    user    binmode
C:\GNU\CYGWIN\BIN          /usr/bin    user    binmode
C:\GNU\CYGWIN\LIB          /usr/lib    user    binmode
C:\GNU\CYGWIN\             /           user    binmode
C:                         /c          user    binmode

If needed, use umount/mount to adjust the mountpoints.

Get Binutils/GCC Source

go to your favourite GNU ftp site (or just try again here) and grab the following files:

binutils-2.10.tar.gz
gcc-core-2.95.2.tar.gz
newlib-1.8.2.tar.gz

Be sure to keep the tarballs for later experiments. (notice that you will need a certain amount of free disc space in order to built the binaries of the crosscompiler.)
Get the tar'ed source and unpack it with 'gnutar' or 'star', don't use winzip to unpack the tar archive, it will not unpack symlinks correctly. (Wincommander seems to work however.)

Prepare environment for building

Create a directory structure like this:

gcc/binutils-2.10    // put the sources here
    gcc-2.95.2
    newlib-1.8.2
    build-binutils   
// working dirs during build
    build-gcc
    build-newlib

note: the directory must be located in the same filesystem as the cygwin stuff. (you gotta mount it properly...)

Now start a CygWin environment using the previously created batchfile.

Setup some environment variables:

$ target=sh-elf
$ prefix=/usr/local
    // toplevel installation directory (default is /usr/local).
$ i=$prefix/bin

$ PATH=$i:$PATH

$ cd gcc

Building Binutils

$ cd build-binutils
$ ../binutils-2.10/configure --target=$target --prefix=$prefix

... this will take a while ...

$ make all install

... and after a short (*G*) time you will find your SH Binutils in /usr/local/bin

Building GCC

now we are ready to built the compiler...

$ cd ../build-gcc
$ ../gcc-2.95.2/configure --target=$target --prefix=$prefix --without-headers --without-libs --with-cpu=sh4

... patience ...

now in the makefile that has been created in build-gcc/gcc/ search for the line

# Additional target-dependent options for compiling libgcc2.a.
TARGET_LIBGCC2_CFLAGS =

and add the option -Dinhibit_libc

$ make LANGUAGES="c" all install

... and voila ... compiler is in /usr/local/bin aswell.

note: if GCC fails to build, have a look at this hack.

Building Newlib

$ cd ../build-newlib
$ ../newlib-1.8.2/configure --target=$target --prefix=$prefix

...mmmh...

$ make all install \
CC_FOR_TARGET=$i/${target}-gcc \
AS_FOR_TARGET=$i/${target}-as \
LD_FOR_TARGET=$i/${target}-ld \
AR_FOR_TARGET=$i/${target}-ar \
RANLIB_FOR_TARGET=$i/${target}-ranlib

... dumdidum ...

So far so good. However, some targets seem to need a patch to fix some endian problem.

... so thats it! Have Fun! To use the sh-tools, start a cygwin environment using that batchfile you created in the beginning. (Adding your crossgcc install dir to your path may come in handy at this point... ;=P).

Test the Compiler

create a little dummy program (test.c) ...

void start(void) {

}

compile ...

$ sh-elf-gcc -ml -Wl,-Ttext,0x8c010000 -nostartfiles -nostdlib -e _start test.c -o test.elf -lgcc

to get a flat binary type:

$ sh-elf-objcopy -O binary test.elf test.bin


08.07.2000 Groepaz/Hitmen

13.08.2000 changed main to start in test proggy.
04.09.2000 added some details, note on arm stuff.

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