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Add sentences clarifying “external” dependencies.

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This commit is contained in:
David Ungar
2018-05-30 17:53:29 -07:00
committed by David Ungar
parent 1edc3be648
commit d2e5239b00
2 changed files with 5 additions and 3 deletions
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3
docs/DependencyAnalysis.rst
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@@ -91,7 +91,8 @@ External Dependencies
=====================
External dependencies, including imported Swift module files and Clang headers,
are tracked using a special ``depends-external`` set. The Swift driver
are tracked using a special ``depends-external`` set. These dependencies refer
to definitions that are external to the module. The Swift driver
interprets this set specially and decides whether or not the cross-module
dependencies have changed.

5
include/swift/Driver/DependencyGraph.h
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@@ -123,8 +123,9 @@ private:
/// The set of marked nodes.
llvm::SmallPtrSet<const void *, 16> Marked;
/// A list of all "external" dependencies that cannot be resolved just from
/// this dependency graph.
/// A list of all external dependencies that cannot be resolved
/// just from this dependency graph. They must be resolved from definitions
/// outside of this module.
llvm::StringSet<> ExternalDependencies;
/// The interface hash for each node. This determines if the interface of