[Buildroot] FENV support in uClibc-ng

[Buildroot] FENV support in uClibc-ng

[Waldemar Brodkorb]

Dear Buildroot maintainers and developers,

I am planning to submit a new package for chawan, a 
nice TUI browser. It has JS support and needs FENV support in
the C library. Can we globally enable FENV support in 
uClibc-ng? I measured the size for a default aarch64 
build with and without FENV support enabled.

With FENV support enabled:
608992 Aug 15 09:07 libuClibc-1.0.59.so

Without FENV support enabled:
584416 Aug 15 09:24 libuClibc-1.0.59.so

Should we add another option for 24kb?

uClibc-ng also gained support for uchar functions a while back.
tpm2-tools needs it. It adds approx. 5kb to the C library.
What should we do here? Enable uchar automatically, when wchar is enabled?

Or is there another better solution I am not seeing?

I would like to support more packages by default for uClibc-ng users.

What you think?

best regards
 Waldemar
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Re: [Buildroot] FENV support in uClibc-ng

[Thomas Petazzoni via buildroot]

Hello Waldemar,

On Sat, Aug 15, 2026 at 09:39:04AM +0200, Waldemar Brodkorb wrote:
> Dear Buildroot maintainers and developers,
> 
> I am planning to submit a new package for chawan, a 
> nice TUI browser. It has JS support and needs FENV support in
> the C library. Can we globally enable FENV support in 
> uClibc-ng? I measured the size for a default aarch64 
> build with and without FENV support enabled.
> 
> With FENV support enabled:
> 608992 Aug 15 09:07 libuClibc-1.0.59.so
> 
> Without FENV support enabled:
> 584416 Aug 15 09:24 libuClibc-1.0.59.so
> 
> Should we add another option for 24kb?

No, just enable it unconditionally.

There's a number of packages that are currently disabled on uClibc
because it lacked fenv support.

> uClibc-ng also gained support for uchar functions a while back.
> tpm2-tools needs it. It adds approx. 5kb to the C library.
> What should we do here? Enable uchar automatically, when wchar is enabled?

Yes, enable uchar when wchar is enabled seems like a good idea.

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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