================
@@ -736,6 +736,19 @@ class Preprocessor {
State ConditionalStackState = Off;
} PreambleConditionalStack;
+ /// Function for getting the dependency preprocessor directives of a file.
+ ///
+ /// These are directives derived from a special form of lexing where the
+ /// source input is scanned for the preprocessor directives that might have
an
+ /// effect on the dependencies for a compilation unit.
+ ///
+ /// Enables a client to cache the directives for a file and provide them
+ /// across multiple compiler invocations.
+ /// FIXME: Allow returning an error.
+ using DependencyDirectivesFn = std::function<std::optional<
----------------
benlangmuir wrote:
I know you're just moving this, but can we make this `llvm::unique_function`? I
don't think we ever need to copy it
https://github.com/llvm/llvm-project/pull/86358
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