[Picolibc] Integrating Picolibc into a GCC toolchain

[R. Diez]

>> I am passing it to GCC's top-level 'configure' script, but
>> libstdc++-v3's 'configure' script is not run at that time, it runs
>> later on, when you invoke 'make' at GCC's top level. Then I see this
>> line in the 'make' output:
>>
>> checking for underlying I/O to use... stdio
> 
> That seems wrong, but I'm not sure how to figure out where it's breaking.
> 
>> So I am guessing that GCC's top-level 'configure' is not passing that
>> flag to libstdc++-v3's 'configure' script.
> 
> It "should", but then so much of gcc configuration is a total mystery.
> [...]

I have created a bug against GCC about this issue:

Bug 104301 - --enable-cstdio=stdio_pure not passed down to libstdc++-v3

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104301

Regards,
   rdiez