Re: problem of using both libgloss and libc

[Dai Yuwen <daiyuwen at sdf dot lonestar dot org>]

On Tue, May 27, 2003 at 03:45:05PM -0400, J. Johnston wrote:
> Dai,
> 
>   For now, supply the definition of errno, either in your main program or 
>   add another stub
> with:  int errno; in it.  I am going to add an errno stub to libnosys so 
> that if not defined,
> libnosys will supply a definition.
> 
>   The arm has all of the syscalls embedded together inside newlib so 
>   putting -lc can end up
> dragging them all in at once.  In your case, you had already supplied a 
> _write syscall via -lnosys
> so you got the error.  It is my future goal to get the syscalls out of 
> newlib and into libgloss.

Thank you.,Jeff.  I understand the problem.

In fact  I don't need syscalls in libc so I remove syscalls.o from libc.a 
using  ar.

Best regard,
Dai Yuwen

> 
> -- Jeff J.
> 
> Dai Yuwen wrote:
> >Hi, Dear All
> >
> >I want to use the libgloss version of _write to run applications on a bare 
> >ARM board.  I find _write use libc:
> >
> >c:/bar/bin/arm-elf-gcc -c   -mlittle-endian  -A 'endian(little)'  
> >-DMACHINE_TYPE
> >_ARM  -w -O0 -g -gstabs main.c
> >c:/bar/bin/arm-elf-ld -Ttext 1008000 -Tdata 101A000 -Tbss 1030000 -n -N 
> >-nostart
> >upfiles -static -EL -e_start  -L"E:/home/yuwen/tmp/newlib" -T"a1.ld" -o 
> >a1.elf s
> >tart_up.o main.o -lnosys  c:/bar/lib/gcc-lib/arm-elf/3.2.3/libgcc.a
> >main.o: In function `__main':
> >main.c:16: warning: _write is not implemented and will always fail
> >/cygdrive/c/bar/arm-elf/lib/libnosys.a(write.o): In function `_write':
> >/cygdrive/c/build/newlib-1.11.0/libgloss/libnosys/write.c:21: undefined 
> >referenc
> >e to `errno'
> >
> >Then I add -lc to the linker, but found libc also had a _write:
> >c:/bar/bin/arm-elf-gcc -c   -mlittle-endian  -A 'endian(little)'  
> >-DMACHINE_TYPE
> >_ARM  -w -O0 -g -gstabs main.c
> >c:/bar/bin/arm-elf-ld -Ttext 1008000 -Tdata 101A000 -Tbss 1030000 -n -N 
> >-nostart
> >upfiles -static -EL -e_start  -L"E:/home/yuwen/tmp/newlib" -T"a1.ld" -o 
> >a1.elf s
> >tart_up.o main.o -lnosys -lc c:/bar/lib/gcc-lib/arm-elf/3.2.3/libgcc.a
> >main.o: In function `__main':
> >main.c:16: warning: _write is not implemented and will always fail
> >/cygdrive/c/bar/arm-elf/lib/libc.a(syscalls.o): In function `_write':
> >/cygdrive/c/build/newlib-1.11.0/newlib/libc/sys/arm/syscalls.c:340: 
> >multiple def
> >inition of `_write'
> >/cygdrive/c/bar/arm-elf/lib/libnosys.a(write.o):/cygdrive/c/build/newlib-1.11.0/
> >libgloss/libnosys/write.c:19: first defined here
> >c:/bar/bin/arm-elf-ld: Warning: size of symbol `_write' changed from 24 to 
> >120 i
> >n /cygdrive/c/bar/arm-elf/lib/libc.a(syscalls.o)
> >make: *** [a1.elf] Error 1
> >
> >If I put -lc before -lnosys, the link was OK.  But the libgloss version of 
> >_write was masked by libc's.  How do sovle this problem? My intent is to 
> >use stdio functions on a ARM board without OS.
> >
> >Best regards,
> >Dai Yuwen
> >
> 
> 

-- 
daiyuwen@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org