================
@@ -308,6 +312,94 @@ inline constexpr ExtensionInfo Extensions[] = {
};
// clang-format on
+struct ExtensionSet {
+ // Set of extensions which are currently enabled.
+ ExtensionBitset Enabled;
+ // Set of extensions which have been enabled or disabled at any point. Used
+ // to avoid cluttering the cc1 command-line with lots of unneeded features.
+ ExtensionBitset Touched;
+ // Base architecture version, which we need to know because some feature
+ // dependencies change depending on this.
+ const ArchInfo *BaseArch;
+
+ ExtensionSet() : Enabled(), Touched(), BaseArch(nullptr) {}
+
+ // Enable the given architecture extension, and any other extensions it
+ // depends on.
+ void enable(ArchExtKind E);
+ // Disable the given architecture extension, and any other extensions which
+ // depend on it.
----------------
DavidSpickett wrote:
Is this exhaustive? If `a` depends on `b` and `c`, I would get `a+b+c`. Then if
I disable `a`, am I left with `b+c`?
https://github.com/llvm/llvm-project/pull/78270
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