Re: Build error with GCC13 + newlib 4.1.0 - error: 'float_t' undeclared

On Sun, May 28, 2023 at 12:28 PM Joel Sherrill <[email protected]> wrote:
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> On Sat, May 27, 2023, 7:02 PM Chris Packham <[email protected]> wrote:
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>> Hello from CT-NG,
>>
>> I user reported the following build error with newlib after GCC13.1
>> was added recently
>
>
> By any chance did the default version of C change in 13 versus what worked.before?
>
> FWIW It looks.like the bleeding edge RTEMS tool builds in our farm have some issue with gdb. So I don't have a handy case to compare.
>

https://gcc.gnu.org/gcc-13/changes.html doesn't mention it explicitly
but I wouldn't be surprised if it has.

>>
>> src/newlib/newlib/libm/math/wf_log2.c:34:22: error: 'float_t'
>> undeclared (first use in this function); did you mean 'float'?
>>        34 |   return (logf(x) / (float_t) M_LN2);
>>           |                      ^~~~~~~
>>           |                      float
>>
>> From what I've been able to follow so far this may have something to
>> do with how FLT_EVAL_METHOD is defined. It's not really mentioned in
>> the GCC docs as something that has changed but I wonder if it is
>> perhaps implied by a C standard the default of which probably has
>> changed.
>>
>> Does this ring any bells for anyone?

I'll also add that I've now double checked the same configuration
works with GCC 12.2