[Buildroot] Building ARM with Soft-float

Ulf Samuelsson ulf at atmel.com
Fri Sep 28 16:28:08 UTC 2007


fre 2007-09-28 klockan 10:56 +0200 skrev Ulf Samuelsson:
> Tried the Integrator-926ejs default.
> =>	This works:
> 

Beeing trying the ARM integrator softfloat the whole day.

Vanilla configuration works.
generic-arm, instead of arm926ejs works

oabi, instead of eabi, generates a new problem
which was not present a week ago.
The C compiler seems to be built with EABI...

My configuration is as follows
> grep ABI .config
BR2_ARM_OABI=y
# BR2_ARM_EABI is not set
> grep ABI toolchain_build_arm_nofpu/uClibc-0.9.29/.config
CONFIG_ARM_OABI=y
# CONFIG_ARM_EABI is not set
> grep abi .config
BR2_GNU_TARGET_SUFFIX="uclibc-linux-gnueabi"

I compile the file a.c:  

> cat a.c
#ifdef  __ARM_EABI__
#warning "EABI"
#endif
> ./arm-uclibc-linux-gnueabi-gcc a.c
a.c:2:2: warning: #warning "EABI"

Why is this?

This results in a failure, since
uClibc/include/bits/sysnum.h is generated from 
<kernel-header>/asm/arch/unistd.h
and if __ARM_EABI__ is set, then 
the Syscall numbers are wrong, and the 
_NR_syscall definition is not (base+113)
as it was one week ago
#define _NR_syscall  (<base>+113)
instead it is
#define _NR_syscall  _NR_syscall

so the build of syscalls.c in uClibc fails.

I can't see anything in the toolset which configures
the ABI for the compiler.



BR
Ulf Samuelsson



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