[flang-commits] [flang] [flang][fir] fix ABI bug 116844 (PR #118121)

[LLVM Continuous Integration via flang-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `flang-aarch64-libcxx` running on `linaro-flang-aarch64-libcxx` while building `flang` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/89/builds/11704

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
64.944 [163/12/7112] Building CXX object tools/flang/lib/Optimizer/CodeGen/CMakeFiles/FIRCodeGen.dir/Target.cpp.o
66.303 [163/11/7113] Linking CXX shared library lib/libFortranSemantics.so.20.0git
66.310 [162/11/7114] Creating library symlink lib/libFortranSemantics.so
66.438 [157/15/7115] Linking CXX executable tools/flang/unittests/Evaluate/logical.test
66.444 [157/14/7116] Linking CXX executable tools/flang/unittests/Evaluate/integer.test
66.448 [157/13/7117] Linking CXX executable tools/flang/unittests/Evaluate/real.test
66.589 [157/12/7118] Linking CXX executable tools/flang/unittests/Evaluate/folding.test
66.650 [157/11/7119] Linking CXX executable tools/flang/unittests/Evaluate/expression.test
68.807 [157/10/7120] Building CXX object tools/flang/lib/Optimizer/CodeGen/CMakeFiles/FIRCodeGen.dir/CodeGenOpenMP.cpp.o
68.936 [157/9/7121] Building CXX object tools/flang/lib/Optimizer/CodeGen/CMakeFiles/FIRCodeGen.dir/TargetRewrite.cpp.o
FAILED: tools/flang/lib/Optimizer/CodeGen/CMakeFiles/FIRCodeGen.dir/TargetRewrite.cpp.o 
/usr/local/bin/c++ -DFLANG_INCLUDE_TESTS=1 -DFLANG_LITTLE_ENDIAN=1 -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/flang-aarch64-libcxx/build/tools/flang/lib/Optimizer/CodeGen -I/home/tcwg-buildbot/worker/flang-aarch64-libcxx/llvm-project/flang/lib/Optimizer/CodeGen -I/home/tcwg-buildbot/worker/flang-aarch64-libcxx/llvm-project/flang/include -I/home/tcwg-buildbot/worker/flang-aarch64-libcxx/build/tools/flang/include -I/home/tcwg-buildbot/worker/flang-aarch64-libcxx/build/include -I/home/tcwg-buildbot/worker/flang-aarch64-libcxx/llvm-project/llvm/include -isystem /home/tcwg-buildbot/worker/flang-aarch64-libcxx/llvm-project/llvm/../mlir/include -isystem /home/tcwg-buildbot/worker/flang-aarch64-libcxx/build/tools/mlir/include -isystem /home/tcwg-buildbot/worker/flang-aarch64-libcxx/build/tools/clang/include -isystem /home/tcwg-buildbot/worker/flang-aarch64-libcxx/llvm-project/llvm/../clang/include -stdlib=libc++ -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Werror -Wno-deprecated-copy -Wno-string-conversion -Wno-ctad-maybe-unsupported -Wno-unused-command-line-argument -Wstring-conversion           -Wcovered-switch-default -Wno-nested-anon-types -O3 -DNDEBUG -std=c++17 -fPIC  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT tools/flang/lib/Optimizer/CodeGen/CMakeFiles/FIRCodeGen.dir/TargetRewrite.cpp.o -MF tools/flang/lib/Optimizer/CodeGen/CMakeFiles/FIRCodeGen.dir/TargetRewrite.cpp.o.d -o tools/flang/lib/Optimizer/CodeGen/CMakeFiles/FIRCodeGen.dir/TargetRewrite.cpp.o -c /home/tcwg-buildbot/worker/flang-aarch64-libcxx/llvm-project/flang/lib/Optimizer/CodeGen/TargetRewrite.cpp
../llvm-project/flang/lib/Optimizer/CodeGen/TargetRewrite.cpp:848:22: error: unused variable 'index' [-Werror,-Wunused-variable]
  848 |                 auto index = e.index();
      |                      ^~~~~
1 error generated.
69.237 [157/8/7122] Building CXX object tools/flang/lib/Optimizer/CodeGen/CMakeFiles/FIRCodeGen.dir/FIROpPatterns.cpp.o
69.594 [157/7/7123] Building CXX object tools/flang/lib/Optimizer/CodeGen/CMakeFiles/FIRCodeGen.dir/TypeConverter.cpp.o
69.920 [157/6/7124] Building CXX object tools/flang/lib/Optimizer/Transforms/CMakeFiles/FIRTransforms.dir/CUFAddConstructor.cpp.o
71.323 [157/5/7125] Building CXX object tools/flang/lib/Optimizer/Transforms/CMakeFiles/FIRTransforms.dir/CUFGPUToLLVMConversion.cpp.o
73.914 [157/4/7126] Building CXX object tools/flang/lib/Optimizer/Transforms/CMakeFiles/FIRTransforms.dir/CUFOpConversion.cpp.o
75.986 [157/3/7127] Building CXX object tools/flang/lib/Optimizer/Transforms/CMakeFiles/FIRTransforms.dir/AddDebugInfo.cpp.o
77.220 [157/2/7128] Building CXX object tools/flang/lib/Optimizer/Transforms/CMakeFiles/FIRTransforms.dir/DebugTypeGenerator.cpp.o
103.338 [157/1/7129] Building CXX object tools/flang/lib/Optimizer/CodeGen/CMakeFiles/FIRCodeGen.dir/CodeGen.cpp.o
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/118121