================
@@ -193,6 +193,20 @@ DwarfFissionKind getDebugFissionKind(const Driver &D,
const llvm::opt::ArgList &Args,
llvm::opt::Arg *&Arg);
+// Calculate the output path of the module file when compiling a module unit
+// with the `-fmodule-output` option or `-fmodule-output=` option specified.
+// The behavior is:
+// - If `-fmodule-output=` is specfied, then the module file is
+// writing to the value.
+// - Otherwise if the output object file of the module unit is specified, the
+// output path
+// of the module file should be the same with the output object file except
+// the corresponding suffix. This requires both `-o` and `-c` are specified.
+// - Otherwise, the output path of the module file will be the same with the
+// input with the corresponding suffix.
+llvm::SmallString<256>
+getCXX20NamedModuleOutputPath(const llvm::opt::ArgList &Args,
----------------
dwblaikie wrote:
Pulling this work out into a named function could probably be a preliminary NFC
commit?
https://github.com/llvm/llvm-project/pull/85050
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