Re: ARM GNU Toolchain 13.2Rel1 newlib issue with sprintf and floating point

[Christophe Lyon <christophe.lyon@arm.com>]

Hi,



On 5/3/24 08:11, Ernesto Vigano' wrote:
> I need to use sprintf with floating point numbers (%f format specifier) 
> in a project based on rpmsg_lite_str_echo_rtos on the cortex-M (NXP 
> Processor).
> I use the recommended 
> arm-gnu-toolchain-12.3.rel1-mingw-w64-i686-arm-none-eabi
> I see that when I call
> 
> sprintf(str, "%d" 3);
> 
> the number 3 is printed to the string str.
> 
> But if I have a floating point number and I use "%f" format specifier
> 
> sprintf(str, "%f" 3.5);

Is this a copy/paste error, or did you forget the ',' before the number 
you want to print?

Thanks,

Christophe

> 
> I get
> ASSERT ERROR " Balloc succeeded ": file 
> "/data/jenkins/workspace/GNU-toolchain/arm-12/src/newlib-cygwin/newlib/libc/stdlib/mprec.c" Line "783" function name ""
> 
> It seems similar to this error
> forum.pjrc.com/index.php 
> <https://forum.pjrc.com/index.php?threads/strange-compiling-problem-assertion-balloc-succeeded-failed-file-data-jenkins-w.72798/>
> that points to this fix
> github.com/.../f88aece242178ff0c187d56e34a79645fbc44a23 
> <https://github.com/zephyrproject-rtos/newlib-cygwin/commit/f88aece242178ff0c187d56e34a79645fbc44a23>
> 
> Is there a way to have sprintf working with floating point numbers?
> 
> Thanks