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

["Russ.Shaw" <russell at webaxs dot net>]

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

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