Re: Compiling gcc.3.0.4 for m68k-elf with C++-support

[Lau Sennels <v6421a at gjk dot dk>]

Hello Kai.

Kai Ruottu wrote:

>  When the 'vsprintf()' should be present in 'libc.a', there aren't a
> reason to duplicate it in 'libiberty.a', so my workaround has been to
> remove it from the needed 'OBJS' (or something) in the Makefile(s).
> First to edit one Makefile and make a diff between the original and
> the edited one and to use the diff with 'patch' for the others... This
> takes totally a minute or less, so searching the bug in the configure-
> system hasn't been very interesting...

Thanks for your help. With a bit of tweaking it worked.

However, both m68k-elf-gcc and m68k-elf-g++ give linking-errors like
these. (sorry if the line breaks have been messed up)

[sennels@src]$ m68k-elf-g++ test.cc
/home/sennels/src/tools/lib/gcc-lib/m68k-elf/3.0.4/../../../../m68k-elf/bin/ld:
warning: cannot find entry symbol _start; defaulting to 80000080
/home/sennels/src/tools/lib/gcc-lib/m68k-elf/3.0.4/../../../../m68k-elf/lib/libstdc++.a(pure.o):
In function `__cxa_pure_virtual':
/home/sennels/src/tools/build-gcc/m68k-elf/libstdc++-v3/libsupc++/../../../../gcc-3.0.4/libstdc++-v3/libsupc++/pure.cc:49:
undefined reference to `write'
/home/sennels/src/tools/lib/gcc-lib/m68k-elf/3.0.4/../../../../m68k-elf/lib/libc.a(abort.o):
In function `abort':
/home/sennels/src/tools/build-newlib/m68k-elf/newlib/libc/stdlib/../../../../../newlib-1.10.0/newlib/libc/stdlib/abort.c:63:
undefined reference to `_exit'
/home/sennels/src/tools/lib/gcc-lib/m68k-elf/3.0.4/../../../../m68k-elf/lib/libc.a(fstatr.o):
In function `_fstat_r':
/home/sennels/src/tools/build-newlib/m68k-elf/newlib/libc/reent/../../../../../newlib-1.10.0/newlib/libc/reent/fstatr.c:62:
undefined reference to `fstat'
/home/sennels/src/tools/lib/gcc-lib/m68k-elf/3.0.4/../../../../m68k-elf/lib/libc.a(makebuf.o):
In function `__smakebuf':
/home/sennels/src/tools/build-newlib/m68k-elf/newlib/libc/stdio/../../../../../newlib-1.10.0/newlib/libc/stdio/makebuf.c:93:
undefined reference to `isatty'
/home/sennels/src/tools/lib/gcc-lib/m68k-elf/3.0.4/../../../../m68k-elf/lib/libc.a(openr.o):
In function `_open_r':
/home/sennels/src/tools/build-newlib/m68k-elf/newlib/libc/reent/../../../../../newlib-1.10.0/newlib/libc/reent/openr.c:59:
undefined reference to `open'
/home/sennels/src/tools/lib/gcc-lib/m68k-elf/3.0.4/../../../../m68k-elf/lib/libc.a(sbrkr.o):
In function `_sbrk_r':
/home/sennels/src/tools/build-newlib/m68k-elf/newlib/libc/reent/../../../../../newlib-1.10.0/newlib/libc/reent/sbrkr.c:60:
undefined reference to `sbrk'
/home/sennels/src/tools/lib/gcc-lib/m68k-elf/3.0.4/../../../../m68k-elf/lib/libc.a(signalr.o):
In function `_kill_r':
/home/sennels/src/tools/build-newlib/m68k-elf/newlib/libc/reent/../../../../../newlib-1.10.0/newlib/libc/reent/signalr.c:61:
undefined reference to `kill'
/home/sennels/src/tools/lib/gcc-lib/m68k-elf/3.0.4/../../../../m68k-elf/lib/libc.a(signalr.o):
In function `_getpid_r':
/home/sennels/src/tools/build-newlib/m68k-elf/newlib/libc/reent/../../../../../newlib-1.10.0/newlib/libc/reent/signalr.c:96:
undefined reference to `getpid'
/home/sennels/src/tools/lib/gcc-lib/m68k-elf/3.0.4/../../../../m68k-elf/lib/libc.a(writer.o):
In function `_write_r':
/home/sennels/src/tools/build-newlib/m68k-elf/newlib/libc/reent/../../../../../newlib-1.10.0/newlib/libc/reent/writer.c:58:
undefined reference to `write'
/home/sennels/src/tools/lib/gcc-lib/m68k-elf/3.0.4/../../../../m68k-elf/lib/libc.a(closer.o):
In function `_close_r':
/home/sennels/src/tools/build-newlib/m68k-elf/newlib/libc/reent/../../../../../newlib-1.10.0/newlib/libc/reent/closer.c:53:
undefined reference to `close'
/home/sennels/src/tools/lib/gcc-lib/m68k-elf/3.0.4/../../../../m68k-elf/lib/libc.a(lseekr.o):
In function `_lseek_r':
/home/sennels/src/tools/build-newlib/m68k-elf/newlib/libc/reent/../../../../../newlib-1.10.0/newlib/libc/reent/lseekr.c:58:
undefined reference to `lseek'
/home/sennels/src/tools/lib/gcc-lib/m68k-elf/3.0.4/../../../../m68k-elf/lib/libc.a(readr.o):
In function `_read_r':
/home/sennels/src/tools/build-newlib/m68k-elf/newlib/libc/reent/../../../../../newlib-1.10.0/newlib/libc/reent/readr.c:58:
undefined reference to `read'
collect2: ld returned 1 exit status
------------------
PREFIX=/home/erik/src
TARGET=m68k-elf

The program looks like this, and (of course) links normally on my native
compiler. Specifying libstdc++.a and includes doesn't help. It seems
the problem is in the newlib libc. I did not specify --enable-threads,
but still it uses the reentrant libc-code version. It also refers to
my build-newlib directory. Is that the correct configuration?

#include<iostream>
#include<vector>

using namespace std;

int main()
{
 int i;
 vector<int> ivec;
 ivec.push_back(i);
 return 0;
}

-- 
 use PDL; use PDL::IO::Pic;$a=zeroes 300,300; $r=$a->xlinvals(-1.5,0.5);
 $i=$a->ylinvals(-1,1);$t=$r;$u=$i;for(1..30){$q=$r**2-$i**2+$t;
 $h=2*$r*$i+$u;$d=$r**2+$i**2;$a=lclip($a,$_*($d>2.0)*($a==0));
 ($r,$i)=map{$_->clip(-5,5)}($q,$h);}$a->wpic("mandelbrot.gif");

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