[Mlir-commits] [mlir] [MLIR] Fix -Wunused-variable (PR #192698)

Fri Apr 17 10:00:43 PDT 2026

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `flang-arm64-windows-msvc` running on `linaro-armv8-windows-msvc-01` while building `mlir` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/207/builds/16317

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (build-unified-tree) failure: build (failure)
...
10.716 [78/10/81] Generating ../../bin/llvm-addr2line.exe
10.733 [77/10/82] Linking CXX executable bin\llvm-profgen.exe
10.741 [76/10/83] Linking CXX executable bin\llvm-sim.exe
10.744 [76/9/84] Linking CXX executable bin\llvm-strings.exe
10.760 [76/8/85] Linking CXX executable bin\llvm-rtdyld.exe
10.788 [76/7/86] Copying llvm-locstats into C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/./bin
10.959 [76/6/87] Linking CXX executable bin\llvm-tli-checker.exe
10.963 [76/5/88] Linking CXX executable bin\verify-uselistorder.exe
10.977 [76/4/89] Linking CXX executable bin\yaml2obj.exe
17.898 [76/3/90] Building CXX object tools/mlir/lib/Dialect/Vector/IR/CMakeFiles/obj.MLIRVectorDialect.dir/VectorOps.cpp.obj
FAILED: tools/mlir/lib/Dialect/Vector/IR/CMakeFiles/obj.MLIRVectorDialect.dir/VectorOps.cpp.obj 
C:\Users\tcwg\scoop\shims\ccache.exe C:\Users\tcwg\scoop\apps\llvm-arm64\current\bin\clang-cl.exe  /nologo -TP -DUNICODE -D_CRT_NONSTDC_NO_DEPRECATE -D_CRT_NONSTDC_NO_WARNINGS -D_CRT_SECURE_NO_DEPRECATE -D_CRT_SECURE_NO_WARNINGS -D_GLIBCXX_ASSERTIONS -D_HAS_EXCEPTIONS=0 -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE -D_SCL_SECURE_NO_DEPRECATE -D_SCL_SECURE_NO_WARNINGS -D_UNICODE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -IC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/tools/mlir/lib/Dialect/Vector/IR -IC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/mlir/lib/Dialect/Vector/IR -IC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/tools/mlir/include -IC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/mlir/include -IC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/include -IC:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/llvm/include /DWIN32 /D_WINDOWS   /Zc:inline /Zc:__cplusplus /Oi /Brepro /bigobj /permissive- -Werror=unguarded-availability-new /W4  -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported /Gw -Wundef -Werror=mismatched-tags -Werror=global-constructors /O2 /Ob2  -std:c++17 -MD -UNDEBUG /EHs-c- /GR- /showIncludes /Fotools/mlir/lib/Dialect/Vector/IR/CMakeFiles/obj.MLIRVectorDialect.dir/VectorOps.cpp.obj /Fdtools\mlir\lib\Dialect\Vector\IR\CMakeFiles\obj.MLIRVectorDialect.dir\ -c -- C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/mlir/lib/Dialect/Vector/IR/VectorOps.cpp
In file included from C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/mlir/lib/Dialect/Vector/IR/VectorOps.cpp:14:
In file included from C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/mlir/include\mlir/Dialect/Vector/IR/VectorOps.h:16:
In file included from C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/mlir/include\mlir/Bytecode/BytecodeOpInterface.h:17:
In file included from C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/mlir/include\mlir/Bytecode/BytecodeImplementation.h:19:
In file included from C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/mlir/include\mlir/IR/Dialect.h:17:
In file included from C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/mlir/include\mlir/IR/OperationSupport.h:19:
C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/mlir/include\mlir/IR/BuiltinAttributes.h(346,14): warning: 'complex' is deprecated: warning STL4037: The effect of instantiating the template std::complex for any type other than float, double, or long double is unspecified. You can define _SILENCE_NONFLOATING_COMPLEX_DEPRECATION_WARNING to suppress this warning. [-Wdeprecated-declarations]
  346 |       return {APFloat(*smt, value.real()), APFloat(*smt, value.imag())};
      |              ^
c:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.39.33519\include\complex(1315,5): note: 'complex' has been explicitly marked deprecated here
 1315 |     _DEPRECATE_NONFLOATING_COMPLEX
      |     ^
c:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.39.33519\include\yvals_core.h(1450,7): note: expanded from macro '_DEPRECATE_NONFLOATING_COMPLEX'
 1450 |     [[deprecated("warning STL4037: "                                                   \
      |       ^
C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/llvm-project/mlir/lib/Dialect/Vector/IR/VectorOps.cpp(3457,35): error: reference to non-static member function must be called; did you mean to call it with no arguments?
 3457 |   assert(!v1Type.isScalable() && !getV2VectorType.isScalable() &&
      |                                   ^~~~~~~~~~~~~~~
C:\Program Files (x86)\Windows Kits\10\include\10.0.22621.0\ucrt\assert.h(40,17): note: expanded from macro 'assert'
   40 |             (!!(expression)) ||                                                              \
      |                 ^~~~~~~~~~
1 warning and 1 error generated.
19.305 [76/2/91] Building CXX object lib/CodeGen/AsmPrinter/CMakeFiles/LLVMAsmPrinter.dir/AsmPrinter.cpp.obj
19.694 [76/1/92] Building CXX object lib/LTO/CMakeFiles/LLVMLTO.dir/LTO.cpp.obj
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/192698