After 18 months of no progress, Don Olmstead and I are getting the band back 
together!

We’ve uploaded a patch to https://bugs.webkit.org/show_bug.cgi?id=143358 
<https://bugs.webkit.org/show_bug.cgi?id=143358> which incorporates feedback 
from many different stakeholders (and as such, the direction is a little 
different than where I was going with this in the beginning).

First of all, this isn’t a new project; instead, it’s a new target inside the 
WebCore project. The target creates a static library which gets linked into 
WebCore, which means that the enforcement mechanism can’t be done by the 
linker. Instead, the layering will be enforced by a Python script, triggered as 
an extra build step, which checks the symbol names inside the .a file as well 
as #include directives in source code.

We opted for WebCore to include files using “#include <PAL/Foo.h>” instead of 
just including Foo.h. Similarly, we are putting symbols inside the PAL 
namespace, which is a child of the WebCore namespace. Therefore, inside 
WebCore, you use PAL things by specifying “PAL::Foo”.

The first thing to move into PAL is the “crypto” subfolder, which is a good 
candidate because it’s small, simple, yet also has platform-dependent 
implementations.

We would love your feedback on this approach to help make the dream a reality!

Thanks,
Myles and Don

> On Mar 22, 2015, at 4:40 PM, Gavin Barraclough <barraclo...@apple.com 
> <mailto:barraclo...@apple.com>> wrote:
> 
>> On Mar 22, 2015, at 4:35 AM, Maciej Stachowiak <m...@apple.com 
>> <mailto:m...@apple.com>> wrote:
>> 
>> Web Abstraction Toolbox (it’s hard to tell the difference between wat and 
>> WTF sometimes…)
> 
> +1
> 
> 
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