CT-NG: floating point support in Newlibs printf?

[Jeppe Ledet-Pedersen]

On 2010-10-21 12:55, Jeppe Ledet-Pedersen wrote:
> Hi
>
> I have successfully compiled a toolchain for my ARM7TDMI with
> crosstool-NG 1.8.1. I have used GCC 4.5.0, Newlib 1.18 and Binutils
> 2.20.1, disabled EABI and software floating point. The full
> build.log.bz2 can be downloaded from
> http://kom.aau.dk/~jledet/build.log.bz2
>
> I can compile my codebase with no errors, but I am having trouble when
> trying to use printf and siblings with floating point values. Everything
> else, including printf's with integers, seems to work as expected.

I just tried compiling with the CodeSourcery 2010q1-188 toolchain and 
got exactly the same problems as with my own toolchain. So I'm 
suspecting that my toolchain is compiled properly and that the problems 
lie in the compilation/linking of my code base.

I compile using Eclipse CDT with the GNU ARM plugin. I compile with 
-mcpu=arm7tdmi and have tried both with -O0, -Os and with or without 
-mfloat-abi=soft.

My old, working toolchain consists of:
  * GCC 4.1.1 with --target=arm-elf --enable-interwork --enable-multilib 
--enable-languages="c,c++" --with-newlib
  * Newlib 1.17 with --target=arm-elf  --enable-interwork --enable-multilib
  * Binutils 2.19.1 with -target=arm-elf --enable-interwork 
--enable-multilib

With my 4.1.1. toolchain, I have no problems with printing floating 
point values.

Do you have any ideas on what could be the problem?

Best regards,
Jeppe

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