[Infrastructure] flang/test/Semantics/windows.f90 failing with "RUN: at line 1 has no command after substitutions"

[dpaoliello]

See build: https://github.com/llvm/llvm-project/actions/runs/16031979757/job/45234562050?pr=146582

Test is failing for Linux only:

2025-07-02T18:03:40.9385241Z FAIL: Flang :: Semantics/windows.f90 (3463 of 3566)
2025-07-02T18:03:40.9385789Z ******************** TEST 'Flang :: Semantics/windows.f90' FAILED ********************
2025-07-02T18:03:40.9386277Z Exit Code: 1
2025-07-02T18:03:40.9386441Z 
2025-07-02T18:03:40.9386576Z Command Output (stdout):
2025-07-02T18:03:40.9386889Z --
2025-07-02T18:03:40.9387125Z --- 
2025-07-02T18:03:40.9387366Z +++ 
2025-07-02T18:03:40.9387633Z @@ -0,0 +1,2 @@
2025-07-02T18:03:40.9387801Z 
2025-07-02T18:03:40.9388091Z expect at 6: User IDs do not exist on Windows. This function will always return 1
2025-07-02T18:03:40.9388756Z expect at 11: Group IDs do not exist on Windows. This function will always return 1
2025-07-02T18:03:40.9389166Z 
2025-07-02T18:03:40.9389319Z FAIL
2025-07-02T18:03:40.9389459Z 
2025-07-02T18:03:40.9389549Z --
2025-07-02T18:03:40.9389783Z Command Output (stderr):
2025-07-02T18:03:40.9390099Z --
2025-07-02T18:03:40.9390396Z RUN: at line 1 has no command after substitutions
2025-07-02T18:03:40.9392544Z "/usr/bin/python3" /home/gha/actions-runner/_work/llvm-project/llvm-project/flang/test/Semantics/test_errors.py /home/gha/actions-runner/_work/llvm-project/llvm-project/flang/test/Semantics/windows.f90 /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/flang --target=aarch64-pc-windows-msvc -Werror # RUN: at line 2
2025-07-02T18:03:40.9396750Z + /usr/bin/python3 /home/gha/actions-runner/_work/llvm-project/llvm-project/flang/test/Semantics/test_errors.py /home/gha/actions-runner/_work/llvm-project/llvm-project/flang/test/Semantics/windows.f90 /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/flang --target=aarch64-pc-windows-msvc -Werror
2025-07-02T18:03:40.9398458Z 
2025-07-02T18:03:40.9398563Z --
2025-07-02T18:03:40.9398690Z 
2025-07-02T18:03:40.9398786Z ********************

The RUN command is contained in an %if block, so if there is no x86_64 or aarch64 registered targets, then it will result in an empty command:

llvm-project/flang/test/Semantics/windows.f90

Lines 1 to 2 in 551d6dd

	! RUN: %if x86_64-registered-target %{ %python %S/test_errors.py %s %flang --target=x86_64-pc-windows-msvc -Werror %}
	! RUN: %if aarch64-registered-target %{ %python %S/test_errors.py %s %flang --target=aarch64-pc-windows-msvc -Werror %}

[llvmbot]

@llvm/issue-subscribers-infrastructure

Author: Daniel Paoliello (dpaoliello)

See build: <https://github.com/llvm/llvm-project/actions/runs/16031979757/job/45234562050?pr=146582>

Test is failing for Linux only:

2025-07-02T18:03:40.9385241Z FAIL: Flang :: Semantics/windows.f90 (3463 of 3566)
2025-07-02T18:03:40.9385789Z ******************** TEST 'Flang :: Semantics/windows.f90' FAILED ********************
2025-07-02T18:03:40.9386277Z Exit Code: 1
2025-07-02T18:03:40.9386441Z 
2025-07-02T18:03:40.9386576Z Command Output (stdout):
2025-07-02T18:03:40.9386889Z --
2025-07-02T18:03:40.9387125Z --- 
2025-07-02T18:03:40.9387366Z +++ 
2025-07-02T18:03:40.9387633Z @@ -0,0 +1,2 @@
2025-07-02T18:03:40.9387801Z 
2025-07-02T18:03:40.9388091Z expect at 6: User IDs do not exist on Windows. This function will always return 1
2025-07-02T18:03:40.9388756Z expect at 11: Group IDs do not exist on Windows. This function will always return 1
2025-07-02T18:03:40.9389166Z 
2025-07-02T18:03:40.9389319Z FAIL
2025-07-02T18:03:40.9389459Z 
2025-07-02T18:03:40.9389549Z --
2025-07-02T18:03:40.9389783Z Command Output (stderr):
2025-07-02T18:03:40.9390099Z --
2025-07-02T18:03:40.9390396Z RUN: at line 1 has no command after substitutions
2025-07-02T18:03:40.9392544Z "/usr/bin/python3" /home/gha/actions-runner/_work/llvm-project/llvm-project/flang/test/Semantics/test_errors.py /home/gha/actions-runner/_work/llvm-project/llvm-project/flang/test/Semantics/windows.f90 /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/flang --target=aarch64-pc-windows-msvc -Werror # RUN: at line 2
2025-07-02T18:03:40.9396750Z + /usr/bin/python3 /home/gha/actions-runner/_work/llvm-project/llvm-project/flang/test/Semantics/test_errors.py /home/gha/actions-runner/_work/llvm-project/llvm-project/flang/test/Semantics/windows.f90 /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/flang --target=aarch64-pc-windows-msvc -Werror
2025-07-02T18:03:40.9398458Z 
2025-07-02T18:03:40.9398563Z --
2025-07-02T18:03:40.9398690Z 
2025-07-02T18:03:40.9398786Z ********************

The RUN command is contained in an %if block, so if there is no x86_64 or aarch64 registered targets, then it will result in an empty command:

llvm-project/flang/test/Semantics/windows.f90

Lines 1 to 2 in 551d6dd

	! RUN: %if x86_64-registered-target %{ %python %S/test_errors.py %s %flang --target=x86_64-pc-windows-msvc -Werror %}
	! RUN: %if aarch64-registered-target %{ %python %S/test_errors.py %s %flang --target=aarch64-pc-windows-msvc -Werror %}

[boomanaiden154]

The RUN command is contained in an %if block, so if there is no x86_64 or aarch64 registered targets, then it will result in an empty command:

I don't understand how this causes the failures observed. The premerge build doesn't set LLVM_TARGETS_TO_BUILD, so we build everything, which includes x86_64 and aarch64.

I also haven't seen this in any recent builds? Is it flaky or deterministic?