[flang-commits] [clang] [flang] [llvm] [CodeGen] Add a FunctionSplittingMode target option (PR #226575)

[via flang-commits]

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@@ -181,6 +181,13 @@ Makes programs 10x faster by doing Special New Thing.
   GNU-vs-EABI distinction is now derived entirely from the target triple's
   environment (e.g. `arm-none-gnueabi` vs `arm-none-eabi`).
 
+* Replaced `TargetOptions::EnableMachineFunctionSplitter` with
+  `TargetOptions::FunctionSplitting`, and the `-split-machine-functions` and
+  `-enable-split-machine-functions` flags with
+  `-function-splitting={none,bbsections,all}`. Use `-function-splitting=all`
+  for the previous behavior. Clang's `-fsplit-machine-functions` is
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MattPD wrote:

Could we distinguish frontend migration from backend tool migration? Before this PR, Clang and Flang accept `-mllvm -enable-split-machine-functions`. With this PR, both report `Unknown command line argument '-function-splitting=all'` for `-mllvm -function-splitting=all`.

For supported frontend targets, the working replacement is `-fsplit-machine-functions`.

https://github.com/llvm/llvm-project/pull/226575