[Lldb-commits] [lldb] [LLDB] Add optional callback function to `TypeMatcher` (PR #143748)

[Pavel Labath via lldb-commits]

labath wrote:

A low-tech way to support both STL versions would be to do a dispatch inside the data formatter:
```
StdStringSummaryProvider(value) {
  if (IsGnuSTL(value))
    return GnuStringSummaryProvider(value);
  return MSVCStringSummaryProvider(value);
}
```

It's not a complete solution as it doesn't allow for a distributed setup (vendor A writes a formatter for type `Foo`, vendor B writes a formatter for its type `Foo`, user C needs to debug both `Foo` types, so it installs both formatters), but for formatters that are a part of lldb (i.e. STL types), that should work fine. And maybe STL types are the only place where this matters?

https://github.com/llvm/llvm-project/pull/143748