[llvm] [flang-rt] Optimise ShallowCopy and use it in CopyInAssign (PR #140569)

Thu May 22 16:29:23 PDT 2025

llvm-ci wrote:

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

Full details are available at: https://lab.llvm.org/buildbot/#/builders/50/builds/13760

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
3.519 [89/67/18] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_debug.cpp.o
3.526 [89/66/19] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/home/tcwg-buildbot/worker/flang-aarch64-dylib/llvm-project/flang/lib/Decimal/decimal-to-binary.cpp.o
3.535 [89/65/20] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_error.cpp.o
3.555 [89/64/21] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_cancel.cpp.o
3.565 [89/63/22] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/connection.cpp.o
3.567 [89/62/23] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/ompd-specific.cpp.o
3.580 [89/61/24] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_global.cpp.o
3.593 [89/60/25] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_utility.cpp.o
3.621 [89/59/26] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_i18n.cpp.o
3.632 [89/58/27] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/assign.cpp.o
FAILED: flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/assign.cpp.o 
/home/tcwg-buildbot/worker/flang-aarch64-dylib/build/./bin/clang++ --target=aarch64-unknown-linux-gnu -D_DEBUG -D_GLIBCXX_ASSERTIONS -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/flang-aarch64-dylib/llvm-project/flang-rt/include -I/home/tcwg-buildbot/worker/flang-aarch64-dylib/llvm-project/flang-rt/../flang/include -I/home/tcwg-buildbot/worker/flang-aarch64-dylib/build/runtimes/runtimes-bins/flang-rt -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 -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wno-unnecessary-virtual-specifier -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=gnu++17 -UNDEBUG -fno-lto -fno-exceptions -fno-rtti -funwind-tables -fno-asynchronous-unwind-tables -U_GLIBCXX_ASSERTIONS -U_LIBCPP_ENABLE_ASSERTIONS -MD -MT flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/assign.cpp.o -MF flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/assign.cpp.o.d -o flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/assign.cpp.o -c /home/tcwg-buildbot/worker/flang-aarch64-dylib/llvm-project/flang-rt/lib/runtime/assign.cpp
/home/tcwg-buildbot/worker/flang-aarch64-dylib/llvm-project/flang-rt/lib/runtime/assign.cpp:594:17: error: use of undeclared identifier 'kNoAsyncId'
  594 |   temp.Allocate(kNoAsyncId);
      |                 ^~~~~~~~~~
1 error generated.
3.680 [89/57/28] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_version.cpp.o
3.686 [89/56/29] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_wait_release.cpp.o
3.766 [89/55/30] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_io.cpp.o
3.823 [89/54/31] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_environment.cpp.o
3.939 [89/53/32] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/home/tcwg-buildbot/worker/flang-aarch64-dylib/llvm-project/flang/lib/Decimal/binary-to-decimal.cpp.o
4.004 [89/52/33] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_alloc.cpp.o
4.009 [89/51/34] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_threadprivate.cpp.o
4.025 [89/50/35] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_str.cpp.o
4.080 [89/49/36] Linking C shared module openmp/libompd/gdb-plugin/python-module/ompd/ompdModule.so
4.378 [89/48/37] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/ompt-general.cpp.o
4.679 [89/47/38] Building CXX object openmp/tools/archer/CMakeFiles/archer.dir/ompt-tsan.cpp.o
4.680 [89/46/39] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_taskdeps.cpp.o
4.695 [89/45/40] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_csupport.cpp.o
4.844 [89/44/41] Building CXX object openmp/libompd/src/CMakeFiles/ompd.dir/omp-icv.cpp.o
4.877 [89/43/42] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/z_Linux_util.cpp.o
4.921 [89/42/43] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_sched.cpp.o
5.028 [89/41/44] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_ftn_cdecl.cpp.o
5.039 [89/40/45] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_itt.cpp.o
5.268 [89/39/46] Building CXX object openmp/libompd/src/CMakeFiles/ompd.dir/omp-debug.cpp.o
5.274 [89/38/47] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_ftn_extra.cpp.o
5.351 [89/37/48] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_dispatch.cpp.o
5.387 [89/36/49] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/thirdparty/ittnotify/ittnotify_static.cpp.o
5.400 [89/35/50] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_collapse.cpp.o
5.502 [89/34/51] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_tasking.cpp.o
5.512 [89/33/52] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/environment.cpp.o
5.515 [89/32/53] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/misc-intrinsic.cpp.o
5.644 [89/31/54] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/derived-api.cpp.o
5.791 [89/30/55] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/internal-unit.cpp.o
5.799 [89/29/56] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_lock.cpp.o
5.829 [89/28/57] Building CXX object openmp/libompd/src/CMakeFiles/ompd.dir/TargetValue.cpp.o
5.839 [89/27/58] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/io-error.cpp.o
5.910 [89/26/59] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_runtime.cpp.o
6.160 [89/25/60] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/memory.cpp.o

```

</details>

https://github.com/llvm/llvm-project/pull/140569