[llvm] [llvm] Use "= default" (NFC) (PR #166088)

Sun Nov 2 17:53:26 PST 2025

llvm-ci wrote:

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

Full details are available at: https://lab.llvm.org/buildbot/#/builders/80/builds/17236

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
-- Performing additional configure checks with target flags: -nostdinc++ -fPIC -fno-builtin -fvisibility=hidden -fomit-frame-pointer -march=armv8-a
-- Performing Test COMPILER_RT_HAS_aarch64_FLOAT16
-- Performing Test COMPILER_RT_HAS_aarch64_FLOAT16 - Success
-- Performing Test COMPILER_RT_HAS_aarch64_BFLOAT16
-- Performing Test COMPILER_RT_HAS_aarch64_BFLOAT16 - Success
-- For aarch64 builtins preferring aarch64/fp_mode.c to fp_mode.c
-- Configuring done (19.7s)
-- Generating done (0.0s)
-- Build files have been written to: /home/tcwg-buildbot/worker/flang-aarch64-sharedlibs/build/runtimes/builtins-bins
1677.248 [542/72/7354] Building CXX object examples/OptSubcommand/CMakeFiles/OptSubcommand.dir/llvm-hello-sub.cpp.o
FAILED: examples/OptSubcommand/CMakeFiles/OptSubcommand.dir/llvm-hello-sub.cpp.o 
/usr/local/bin/c++ -DGTEST_HAS_RTTI=0 -DLLVM_BUILD_STATIC -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/flang-aarch64-sharedlibs/build/examples/OptSubcommand -I/home/tcwg-buildbot/worker/flang-aarch64-sharedlibs/llvm-project/llvm/examples/OptSubcommand -I/home/tcwg-buildbot/worker/flang-aarch64-sharedlibs/build/include -I/home/tcwg-buildbot/worker/flang-aarch64-sharedlibs/llvm-project/llvm/include -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 -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT examples/OptSubcommand/CMakeFiles/OptSubcommand.dir/llvm-hello-sub.cpp.o -MF examples/OptSubcommand/CMakeFiles/OptSubcommand.dir/llvm-hello-sub.cpp.o.d -o examples/OptSubcommand/CMakeFiles/OptSubcommand.dir/llvm-hello-sub.cpp.o -c /home/tcwg-buildbot/worker/flang-aarch64-sharedlibs/llvm-project/llvm/examples/OptSubcommand/llvm-hello-sub.cpp
../llvm-project/llvm/examples/OptSubcommand/llvm-hello-sub.cpp:49:51: error: expected '{' or ','
   49 |                         OptionSubCommandIDsTable) = default;
      |                                                   ^
1 error generated.
1696.414 [542/30/7396] Building CXX object examples/Kaleidoscope/BuildingAJIT/Chapter4/CMakeFiles/BuildingAJIT-Ch4.dir/toy.cpp.o
1697.631 [542/28/7398] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/parse-tree.cpp.o
1697.858 [542/27/7399] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/cmake_pch.hxx.pch
1717.935 [542/26/7400] Building CXX object tools/flang/tools/fir-opt/CMakeFiles/fir-opt.dir/fir-opt.cpp.o
1719.018 [542/25/7401] Building CXX object tools/flang/tools/tco/CMakeFiles/tco.dir/tco.cpp.o
1719.749 [542/24/7402] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/openacc-parsers.cpp.o
1722.220 [542/23/7403] Building CXX object tools/flang/examples/PrintFlangFunctionNames/CMakeFiles/flangPrintFunctionNames.dir/PrintFlangFunctionNames.cpp.o
1723.121 [542/22/7404] Building CXX object tools/flang/examples/FlangOmpReport/CMakeFiles/flangOmpReport.dir/FlangOmpReport.cpp.o
1723.287 [542/21/7405] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/cmake_pch.hxx.pch
1723.489 [542/20/7406] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/io-parsers.cpp.o
1729.779 [542/19/7407] Building CXX object tools/flang/lib/FrontendTool/CMakeFiles/flangFrontendTool.dir/ExecuteCompilerInvocation.cpp.o
1733.931 [542/18/7408] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/program-parsers.cpp.o
1736.191 [542/17/7409] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/executable-parsers.cpp.o
1744.381 [542/16/7410] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/unparse.cpp.o
1745.906 [542/15/7411] Building CXX object tools/flang/tools/fir-lsp-server/CMakeFiles/fir-lsp-server.dir/fir-lsp-server.cpp.o
1756.733 [542/14/7412] Building CXX object tools/flang/lib/Optimizer/HLFIR/Transforms/CMakeFiles/HLFIRTransforms.dir/SimplifyHLFIRIntrinsics.cpp.o
1756.974 [542/13/7413] Building CXX object tools/flang/lib/Frontend/CMakeFiles/flangFrontend.dir/cmake_pch.hxx.pch
1757.088 [542/12/7414] Building CXX object tools/flang/lib/Optimizer/HLFIR/Transforms/CMakeFiles/HLFIRTransforms.dir/LowerHLFIRIntrinsics.cpp.o
1762.968 [542/11/7415] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/IntrinsicCall.cpp.o
1763.583 [542/10/7416] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/Fortran-parsers.cpp.o
1770.289 [542/9/7417] Building CXX object tools/flang/examples/FeatureList/CMakeFiles/flangFeatureList.dir/FeatureList.cpp.o
1774.249 [542/8/7418] Building CXX object tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/cmake_pch.hxx.pch
1784.040 [542/7/7419] Building CXX object tools/mlir/lib/Dialect/SPIRV/IR/CMakeFiles/obj.MLIRSPIRVDialect.dir/SPIRVDialect.cpp.o
1802.237 [542/6/7420] Building CXX object tools/flang/lib/Optimizer/CodeGen/CMakeFiles/FIRCodeGen.dir/CodeGen.cpp.o
1803.352 [542/5/7421] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/openmp-parsers.cpp.o
1805.617 [542/4/7422] Building CXX object tools/flang/tools/bbc/CMakeFiles/bbc.dir/bbc.cpp.o
1805.724 [542/3/7423] Building CXX object tools/mlir/lib/Dialect/LLVMIR/CMakeFiles/obj.MLIRNVVMDialect.dir/IR/NVVMDialect.cpp.o
1824.872 [542/2/7424] Building CXX object tools/mlir/lib/Dialect/LLVMIR/CMakeFiles/obj.MLIRROCDLDialect.dir/IR/ROCDLDialect.cpp.o
1833.640 [542/1/7425] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/PPCIntrinsicCall.cpp.o
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/166088