Building the _uuid accelerator module for CPython 3.7

[Nick Coghlan]

Hi folks,

If anyone has built the development version of CPython on Fedora in
recent weeks you've likely received the following message:

```
The necessary bits to build these optional modules were not found:
_uuid
```

This is a consequence of the new uuid accelerator module introduced in
https://bugs.python.org/issue11063, which means there's a new optional
build dependency in 3.7 that "sudo dnf builddep python3" won't pick up
yet.

The first way that this can fail is simply because the new build
dependency is missing:

$ ./configure | grep uuid
    checking for uuid_generate_time_safe... no

The fix for that is to install libuuid-devel:

$ sudo dnf install libuuid-devel
    $ ./configure | grep uuid
    checking for uuid_generate_time_safe... yes

However, there was also a bug in the build time check for the
existence of `uuid.h` and I've only just submitted the PR to fix that:
https://github.com/python/cpython/pull/4565

Cheers,
Nick.

[Charalampos Stratakis]

----- Original Message -----
> From: "Nick Coghlan" 
> To: "Fedora Python SIG" 
> Sent: Sunday, November 26, 2017 3:52:50 AM
> Subject: Building the _uuid accelerator module for CPython 3.7
>
> Hi folks,
>
> If anyone has built the development version of CPython on Fedora in
> recent weeks you've likely received the following message:
> The necessary bits to build these optional modules were not found:
> _uuid
>
> This is a consequence of the new uuid accelerator module introduced in
> https://bugs.python.org/issue11063, which means there's a new optional
> build dependency in 3.7 that "sudo dnf builddep python3" won't pick up
> yet.
>
> The first way that this can fail is simply because the new build
> dependency is missing:
> $ ./configure | grep uuid
> checking for uuid_generate_time_safe... no
>
> The fix for that is to install libuuid-devel:
> $ sudo dnf install libuuid-devel
> $ ./configure | grep uuid
> checking for uuid_generate_time_safe... yes
>
> However, there was also a bug in the build time check for the
> existence of `uuid.h` and I've only just submitted the PR to fix that:
> https://github.com/python/cpython/pull/4565
>
> Cheers,
> Nick.
>
> --
> Nick Coghlan   |   [e-mail]   |   Brisbane, Australia
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Thanks a bunch for the heads up Nick!