HELP - GCC Cross Compiler: LD Returns "`_atexit` undefined in fuction `__do_global_ctors'"

HELP - GCC Cross Compiler: LD Returns "`_atexit` undefined in fuction `__do_global_ctors'"

[Dominic Clifton]

Hi there..

I'm tying to get a cross-compiler working so that I can code C programs for
a Sega Dreamcast (Hitachi SH4).

I downloaded:

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

uncompressed them to /usr/src/crosscompiler and then did the following
commands:

$ target=sh-elf
$ prefix=/usr/local/crosscompiler
$ i=$prefix/bin
$ PATH=$i:$PATH


$ mkdir build-binutils
$ mkdir build-gcc

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

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

Then "vi /gcc/Makefile" and adding "-Dinhibit_libc" to
"TARGET_LIBGCC2_CFLAGS="

$ make LANGUAGES="c" all install

Then I add my new /bin directory with my new binaries to the path

$ PATH=$i:$PATH

Then I'm creating a "test.c" file:

void main ( void) {
}

Then I compile like this:

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

and it returns:

test.c: In function `main':
test.c:1: warning: return type of `main' is not `int'
/usr/local/crosscompiler/lib/gcc-lib/sh-elf/2.95.2/ml/libgcc.a(__main.o): In
fuction `__do_global_ctors':
__main.o(.text+0x74): undefined reference to `atexit'
collect2: ld returned 1 exit status

How do I fix this ?

I'm guessing I need some form of linker script, but can someone tell me what
I need please ?

I've been trying to get this to work for a week now, it's driving me mad!

Dom

p.s.  I downloaded "newlib-1.8.2.tar.gz" and "make"'d that, but the same
thing
happens. (Which I'd of expected anyway..)




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Re: HELP - GCC Cross Compiler: LD Returns "`_atexit` undefined in fuction `__do_global_ctors'"

[Russ.Shaw]

Shouldn't you be logged as root to do the make all install step?

In your compile step:
> sh-elf-gcc -ml -Wl,-Ttext,0x8c010000 -nostartfiles -nostdlib -e _main

-Wl,-Ttext is telling the linker to use the linker script: 'text', iirc.
I don't know what the 0x8c010000 is for.

In this step:
> ../gcc-2.95.2/configure --target=$target --prefix=$prefix --without-headers
> --without-libs --with-cpu=sh4

I wouldn't think --without-libs and --without-headers is necessary, because
i've found that the C libs only get included when you #include the relevant
header files.

In straight C, the crt0.o start-up file calls _main. In C++ iirc, __main and
___main are called to do constructors and destructors, so i think you must
be using a C++ start-up file. Using your own start-up one will probably fix
it.

In /usr/local/crosscompiler/libs, or somewhere around there, you might find
a directory called ldscripts. Looking at these will give clues on how to
write your own.

Dominic Clifton wrote:
> 
> Hi there..
> 
> I'm tying to get a cross-compiler working so that I can code C programs for
> a Sega Dreamcast (Hitachi SH4).
> 
> I downloaded:
> 
> binutils-2.10.tar.gz
> gcc-core-2.95.2.tar.gz
> 
> uncompressed them to /usr/src/crosscompiler and then did the following
> commands:
> 
> $ target=sh-elf
> $ prefix=/usr/local/crosscompiler
> $ i=$prefix/bin
> $ PATH=$i:$PATH
> 
> $ mkdir build-binutils
> $ mkdir build-gcc
> 
> $ cd build-binutils
> $ ../binutils-2.10/configure --target=$target --prefix=$prefix
> $ make all install
> 
> $ cd ../build-gcc
> $
> ../gcc-2.95.2/configure --target=$target --prefix=$prefix --without-headers
> --without-libs --with-cpu=sh4
> 
> Then "vi /gcc/Makefile" and adding "-Dinhibit_libc" to
> "TARGET_LIBGCC2_CFLAGS="
> 
> $ make LANGUAGES="c" all install
> 
> Then I add my new /bin directory with my new binaries to the path
> 
> $ PATH=$i:$PATH
> 
> Then I'm creating a "test.c" file:
> 
> void main ( void) {
> }
> 
> Then I compile like this:
> 
> sh-elf-gcc -ml -Wl,-Ttext,0x8c010000 -nostartfiles -nostdlib -e _main
> test.c -o test.elf -lgcc
> 
> and it returns:
> 
> test.c: In function `main':
> test.c:1: warning: return type of `main' is not `int'
> /usr/local/crosscompiler/lib/gcc-lib/sh-elf/2.95.2/ml/libgcc.a(__main.o): In
> fuction `__do_global_ctors':
> __main.o(.text+0x74): undefined reference to `atexit'
> collect2: ld returned 1 exit status
> 
> How do I fix this ?
> 
> I'm guessing I need some form of linker script, but can someone tell me what
> I need please ?
> 
> I've been trying to get this to work for a week now, it's driving me mad!
> 
> Dom
> 
> p.s.  I downloaded "newlib-1.8.2.tar.gz" and "make"'d that, but the same
> thing
> happens. (Which I'd of expected anyway..)
> 
> ------
> Want more information?  See the CrossGCC FAQ, http://www.objsw.com/CrossGCC/
> Want to unsubscribe? Send a note to crossgcc-unsubscribe@sourceware.cygnus.com

-- 
*******************************************
*   Russell Shaw, B.Eng, M.Eng(Research)  *
*      email: russell@webaxs.net          *
*      Australia                          *
*******************************************

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