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

[Tarun Prabhu via flang-commits]

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@@ -0,0 +1,22 @@
+! Check that -flto=thin without -fsplit-lto-unit has EnableSplitLTOUnit = 0
+! RUN: %flang -flto=thin  -S -emit-llvm -o - %s |  FileCheck %s
+! RUN: %flang -flto=thin -S -emit-llvm -o - %s |  FileCheck %s
+! RUN: %flang -flto=thin --target=x86_64-linux-gnu -emit-llvm -S -o - %s |  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 -emit-llvm -S -o - %s | FileCheck %s --check-prefix=SPLIT
+! RUN: %flang -flto=thin --target=x86_64-linux-gnu -fsplit-lto-unit -emit-llvm -S -o - %s | FileCheck %s --check-prefix=SPLIT
+! SPLIT: !{i32 1, !"EnableSplitLTOUnit", i32 1}
+!
+! Check that regular LTO has EnableSplitLTOUnit = 1
+! RUN: %flang -flto -emit-llvm -S -o - %s | FileCheck %s --implicit-check-not="EnableSplitLTOUnit" --check-prefix=SPLIT
+! RUN: %flang -flto --target=x86_64-linux-gnu -emit-llvm -S  -o - %s |  FileCheck %s --implicit-check-not="EnableSplitLTOUnit" --check-prefix=SPLIT
+
+! Check that regular LTO has no EnableSplitLTOUnit = 1 for apple targets
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tarunprabhu wrote:

Just to be clear, for ThinLTO on Apple targets, "EnableSplitLTOUnit" may be equal to 1?

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