Bug 276601 – Regression(275398) "error: lambda without a parameter clause is a C++23 extension"

• Status: RESOLVED
• Resolution: FIXED
• Component: Web Template Framework

[Gerald Squelart]

Since bug 275398 I'm getting a few of these errors:
```
/Volumes/WebKit/OpenSource/WebKitBuild/Release/usr/local/include/wtf/HashTable.h:480:115: error: lambda without a parameter clause is a C++23 extension [-Werror,-Wc++23-extensions]
  480 |         AddResult add(const ValueType& value) { return add<IdentityTranslatorType>(Extractor::extract(value), [&] ALWAYS_INLINE_LAMBDA { return value; }); }
```
with `#define ALWAYS_INLINE_LAMBDA __attribute__((__always_inline__))`.

It seems the C++20 compiler doesn't like `[...] ALWAYS_INLINE_LAMBDA {...}`, this can be fixed by adding an explicit empty parameter list before the macro: `[...]() ALWAYS_INLINE_LAMBDA {...}`.

[Radar WebKit Bug Importer]

<rdar://problem/131735283>

[Gerald Squelart]

Pull request: https://github.com/WebKit/WebKit/pull/30809

[EWS]

Committed 280959@main (1609620e6541): <https://commits.webkit.org/280959@main>

Reviewed commits have been landed. Closing PR #30809 and removing active labels.