Building a win32 cygwin gcc cross compiler for ARM

--------------------------------------------------

  info from David Welch



(NOTE: He hasn't given me permission to give out

 his email so don't ask for it.)



The following info is for compiling ARM GCC on linux.

To compile Thumb GCC replace all occurances of --target=arm-elf with:

   --target=thumb-elf

To compile ARM & Thumb support in the same version of GCC use this

instead with gcc 3.0 or later:

   --target=arm-thumb-elf



get 



binutils-2.10.1.tar.gz

gcc-core-2.95.2.1.tar.gz

newlib-1.9.0.tar.gz



mkdir /gcc

cd /gcc

tar xzvf binutils-2.10.1.tar.gz

tar xzvf gcc-core-2.95.2.1.tar.gz

tar xzvf newlib-1.9.0.tar.gz



(Check here for newlib: ftp://ftp.freesoftware.com/pub/sourceware/newlib/)



PATH=/gcc/bin:$PATH



mkdir build

cd build



mkdir binutils

cd binutils



/gcc/binxxx/configure --target=arm-elf --prefix=/gcc/bin



make all install





cd /gcc/gcc-2.95.2.1/gcc/config/arm/



Add



#define HAS_INIT_SECTION



to beginning of elf.h file

This will supress the gccmain and ctors and dtors stuff...



cd /gcc/build

mkdir gcc

cd gcc



/gcc/gcc-2.95.2.1/configure --target=arm-elf --prefix=/gcc --without-headers --without-libs





in /gcc/build/gcc/gcc/Makefile



change FROM:

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

TARGET_LIBGCC2_CFLAGS = 



TO:

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

TARGET_LIBGCC2_CFLAGS = -Dinhibit_libc





You may need to do this to get a clean compile:

edit /usr/include/w32api/winnt.h



FROM:

typedef struct _IMAGE_IMPORT_BY_NAME {

    WORD Hint;

    BYTE Name[1];

} IMAGE_IMPORT_BY_NAME,*PIMAGE_IMPORT_BY_NAME;



TO:

typedef struct _IMAGE_IMPORT_BY_NAME {

    unsigned short Hint;

    unsigned char Name[1];

} IMAGE_IMPORT_BY_NAME,*PIMAGE_IMPORT_BY_NAME;





make LANGUAGES="c" all install





cd /gcc/newlib-1.9.0/newlib/libc/sys/arm/



edit libcfunc.c and syscalls.c



blow away all the swi stuff and basically make everything an

empty shell:



{

    return(0);

}       



at some point you need to tailor this crt0.S to your needs 

(setup the stack pointer, clear the bss mem, and jump to main)

then save the resulting crt0.o in /gcc/arm-elf/lib/



cd /gcc/build

mkdir newlib

cd newlib



/gcc/newlib-1.9.0/configure --target=arm-elf --prefix=/gcc



make all install