[flang-commits] [clang] [flang] [Flang][Driver] Support for -fsplit-lto-unit option in flang driver (PR #202858)

[via flang-commits]

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+! ; Check that -flto=thin without -fsplit-lto-unit has EnableSplitLTOUnit = 0
+! RUN: %flang -flto=thin  -c -o - %s | llvm-dis | FileCheck %s
+! RUN: %flang -flto=thin -c -o - %s | llvm-dis | FileCheck %s
+! RUN: %flang -flto=thin --target=x86_64-linux-gnu -c -o - %s | llvm-dis | FileCheck %s
+! CHECK: !{i32 1, !"EnableSplitLTOUnit", i32 0}
+!
+! ; Check that -flto=thin with -fsplit-lto-unit has EnableSplitLTOUnit = 1
+! RUN: %flang -flto=thin -fsplit-lto-unit -c -o - %s | llvm-dis | FileCheck %s --check-prefix=SPLIT
+! RUN: %flang -flto=thin --target=x86_64-linux-gnu -fsplit-lto-unit -c -o - %s | llvm-dis | FileCheck %s --check-prefix=SPLIT
+! SPLIT: !{i32 1, !"EnableSplitLTOUnit", i32 1}
+!
+! ; Check that regular LTO has EnableSplitLTOUnit = 1
+! RUN: %flang -flto -c -o - %s | llvm-dis | FileCheck %s --implicit-check-not="EnableSplitLTOUnit" --check-prefix=SPLIT
+! RUN: %flang -flto --target=x86_64-linux-gnu -c -o - %s | llvm-dis | FileCheck %s --implicit-check-not="EnableSplitLTOUnit" --check-prefix=SPLIT
+
+! ; Check that regular LTO has no EnableSplitLTOUnit = 1 for apple targets
+! RUN: %flang -flto --target=x86_64-apple-macosx -c -o - %s | llvm-dis | not FileCheck %s --implicit-check-not="EnableSplitLTOUnit" --check-prefix=SPLIT
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shivaramaarao wrote:

we dont want to emit EnableSplitLTOUnit = 1 for apple targets. Added proper checks now

https://github.com/llvm/llvm-project/pull/202858