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

[Leandro Lupori via flang-commits]

luporl wrote:

`flang/test/Integration/split-lto-unit-2.f90` fails on arm64 Darwin.
Should this test be marked as unsupported on system-darwin?

```
# RUN: at line 12
/Users/leandro.lupori/home/git/flang/build/bin/flang -flto -S -o - /Users/leandro.lupori/home/git/flang/llvm-project/flang/test/Integration/split-lto-unit-2.f90 | /Users/leandro.lupori/home/git/flang/build/bin/FileCheck /Users/leandro.lupori/home/git/flang/llvm-project/flang/test/Integration/split-lto-unit-2.f90 --implicit-check-not="EnableSplitLTOUnit" --check-prefix=SPLIT1
# executed command: /Users/leandro.lupori/home/git/flang/build/bin/flang -flto -S -o - /Users/leandro.lupori/home/git/flang/llvm-project/flang/test/Integration/split-lto-unit-2.f90
# executed command: /Users/leandro.lupori/home/git/flang/build/bin/FileCheck /Users/leandro.lupori/home/git/flang/llvm-project/flang/test/Integration/split-lto-unit-2.f90 --implicit-check-not=EnableSplitLTOUnit --check-prefix=SPLIT1
# .---command stderr------------
# | /Users/leandro.lupori/home/git/flang/llvm-project/flang/test/Integration/split-lto-unit-2.f90:19:11: error: SPLIT1: expected string not found in input
# | ! SPLIT1: !{i32 1, !"EnableSplitLTOUnit", i32 1}
# |           ^
# | <stdin>:1:1: note: scanning from here
# | ; ModuleID = 'FIRModule'
# | ^
# | <stdin>:29:6: note: possible intended match here
# | !2 = !{i32 8, !"PIC Level", i32 2}
# |      ^
# |
# | Input file: <stdin>
# | Check file: /Users/leandro.lupori/home/git/flang/llvm-project/flang/test/Integration/split-lto-unit-2.f90
# |
# | -dump-input=help explains the following input dump.
# |
# | Input was:
# | <<<<<<
# |             1: ; ModuleID = 'FIRModule'
# | check:19'0     X~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
# |             2: source_filename = "FIRModule"
# | check:19'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |             3: target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-n32:64-S128-Fn32"
# | check:19'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |             4: target triple = "arm64-apple-macosx26.0.0"
# | check:19'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |             5:
# | check:19'0     ~
# |             6: define void @_QQmain() #0 {
# | check:19'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |             .
# |             .
# |             .
# |            24: !llvm.ident = !{!0}
# | check:19'0     ~~~~~~~~~~~~~~~~~~~~
# |            25: !llvm.module.flags = !{!1, !2}
# | check:19'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |            26:
# | check:19'0     ~
# |            27: !0 = !{!"flang version 23.0.0 (git at github.com:llvm/llvm-project.git 9b29fb8c82117f5dfae60591b568ef589b3c82d2)"}
# | check:19'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |            28: !1 = !{i32 2, !"Debug Info Version", i32 3}
# | check:19'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |            29: !2 = !{i32 8, !"PIC Level", i32 2}
# | check:19'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | check:19'1          ?                              possible intended match
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1
```

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