[Buildroot] [buildroot 0001542]: arm gcc-4.1.2 + oabi + soft floats fails to build

Ulf Samuelsson ulf at atmel.com
Fri Oct 19 19:14:27 UTC 2007


----- Original Message ----- 
From: "Ivan Kuten" <ivan.kuten at promwad.com>
To: <hamish at cloud.net.au>
Cc: <buildroot at uclibc.org>
Sent: Friday, October 19, 2007 8:37 PM
Subject: Re: [Buildroot] [buildroot 0001542]: arm gcc-4.1.2 + oabi + soft 
floats fails to build


>> Summary:                    arm gcc-4.1.2 + oabi + soft floats fails to 
>> build
>> Description:
>> gcc 4.1.2 fails to build for OABI with soft floats enabled, with 
>> references
>> to missing float functions.
>>
>> The patch I supplied for gcc-4.2.1 works as-is for 4.1.2 also.
>> So copying toolchain/gcc/4.2.1/910-soft-float.patch to 
>> toolchain/gcc/4.1.2
>> will fix this.
>>
>
> Hi Hamish,
>
> I tried to apply your patch 910-soft-float.patch
>
> BR2_ARM_TYPE="ARM920T"
> BR2_ARM_OABI=y
> # BR2_ARM_EABI is not set
> BR2_ARCH="arm"
> ..
> BR2_GCC_VERSION_4_1_2=y
> ..
> BR2_GCC_VERSION="4.1.2"
> BR2_SOFT_FLOAT=y


> It compiled successfully but
>
> readelf -h build_arm/staging_dir/lib/libuClibc-0.9.29.so
> ELF Header:
>  Magic:   7f 45 4c 46 01 01 01 61 00 00 00 00 00 00 00 00
>  Class:                             ELF32
>  Data:                              2's complement, little endian
>  Version:                           1 (current)
>  OS/ABI:                            ARM
>  ABI Version:                       0
>  Type:                              DYN (Shared object file)
>  Machine:                           ARM
>  Version:                           0x1
>  Entry point address:               0xa520
>  Start of program headers:          52 (bytes into file)
>  Start of section headers:          525932 (bytes into file)
>  Flags:                             0x202, has entry point, GNU EABI, 
> software FP
>  Size of this header:               52 (bytes)
>  Size of program headers:           32 (bytes)
>  Number of program headers:         6
>  Size of section headers:           40 (bytes)
>  Number of section headers:         23
>  Section header string table index: 22
>
>
> Seems I get anyway EABI not OABI. Can you confirm this?

Once you have stored you ".config" the first time, the compiler
will not change OABI/EABI.
It will go for the string "linux-...-eabi" which is probably present in your 
.config

$ grep eabi .config

to check.


Best Regards
Ulf Samuelsson




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