[llvm] Be explicit about what libstdc++ C++11 ABI to use (PR #154447)

Fri Aug 22 18:51:54 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `flang-aarch64-debug-reverse-iteration` running on `linaro-flang-aarch64-debug-reverse-iteration` while building `llvm` at step 7 "test-build-unified-tree-check-flang-rt".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/20/builds/12872

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

```
Step 7 (test-build-unified-tree-check-flang-rt) failure: test (failure)
...
91.067 [2/9/33] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/ListInputTest.cpp.o
92.815 [2/8/34] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Namelist.cpp.o
97.410 [2/7/35] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Reduction.cpp.o
101.791 [2/6/36] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Transformational.cpp.o
101.921 [2/5/37] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/CommandTest.cpp.o
102.214 [2/4/38] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Format.cpp.o
104.264 [2/3/39] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Complex.cpp.o
111.459 [2/2/40] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/CharacterTest.cpp.o
111.613 [2/1/41] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/NumericalFormatTest.cpp.o
111.960 [1/1/42] Linking CXX executable flang-rt/unittests/Runtime/RuntimeTests
FAILED: flang-rt/unittests/Runtime/RuntimeTests 
: && /home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/build/./bin/clang++ --target=aarch64-unknown-linux-gnu -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 -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -fuse-ld=lld -Wl,--color-diagnostics flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/AccessTest.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Allocatable.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/ArrayConstructor.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Assign.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/BufferTest.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/CharacterTest.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/CommandTest.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Complex.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/CrashHandlerFixture.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Derived.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Descriptor.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/ExternalIOTest.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Format.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/InputExtensions.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Inquiry.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/ListInputTest.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/LogicalFormatTest.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Matmul.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/MatmulTranspose.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/MiscIntrinsic.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Namelist.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Numeric.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/NumericalFormatTest.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Pointer.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Ragged.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Random.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Reduction.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/RuntimeCrashTest.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Stop.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Support.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Time.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/TemporaryStack.cpp.o flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Transformational.cpp.o -o flang-rt/unittests/Runtime/RuntimeTests  /home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/build/lib/libLLVMSupport.a  /home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/build/lib/libllvm_gtest_main.a  /home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/build/lib/libllvm_gtest.a  /home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/build/lib/clang/22/lib/aarch64-unknown-linux-gnu/libflang_rt.runtime.a  /home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/build/lib/libLLVMSupport.a  -lrt  -ldl  -lm  /usr/lib/aarch64-linux-gnu/libz.so  /home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/build/lib/libLLVMDemangle.a  -lpthread && :
ld.lld: error: undefined symbol: testing::internal::GetBoolAssertionFailureMessage[abi:cxx11](testing::AssertionResult const&, char const*, char const*, char const*)
>>> referenced by Assign.cpp:25 (/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/flang-rt/unittests/Runtime/Assign.cpp:25)
>>>               flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Assign.cpp.o:(Assign__FortranACopyInAssign_Test::TestBody())
>>> referenced by AccessTest.cpp:144 (/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/flang-rt/unittests/Runtime/AccessTest.cpp:144)
>>>               flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/AccessTest.cpp.o:(AccessTests_TestExists_Test::TestBody())
>>> referenced by Allocatable.cpp:31 (/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/flang-rt/unittests/Runtime/Allocatable.cpp:31)
>>>               flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Allocatable.cpp.o:(AllocatableTest_MoveAlloc_Test::TestBody())
>>> referenced 345 more times

ld.lld: error: undefined symbol: llvm::Twine::str[abi:cxx11]() const
>>> referenced by AccessTest.cpp:86 (/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/flang-rt/unittests/Runtime/AccessTest.cpp:86)
>>>               flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/AccessTest.cpp.o:(createTemporaryFile[abi:cxx11](char const*, (anonymous namespace)::AccessType const&))

ld.lld: error: undefined symbol: testing::internal::EqFailure(char const*, char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&, bool)
>>> referenced by gtest.h:1362 (/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/third-party/unittest/googletest/include/gtest/gtest.h:1362)
>>>               flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Assign.cpp.o:(testing::AssertionResult testing::internal::CmpHelperEQFailure<Fortran::runtime::TypeCode, Fortran::runtime::TypeCode>(char const*, char const*, Fortran::runtime::TypeCode const&, Fortran::runtime::TypeCode const&))
>>> referenced by gtest.h:1362 (/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/third-party/unittest/googletest/include/gtest/gtest.h:1362)
>>>               flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Allocatable.cpp.o:(testing::AssertionResult testing::internal::CmpHelperEQFailure<std::basic_string_view<char, std::char_traits<char>>, char [50]>(char const*, char const*, std::basic_string_view<char, std::char_traits<char>> const&, char const (&) [50]))
>>> referenced by gtest.h:1362 (/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/third-party/unittest/googletest/include/gtest/gtest.h:1362)
>>>               flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Allocatable.cpp.o:(testing::AssertionResult testing::internal::CmpHelperEQFailure<unsigned long, unsigned int>(char const*, char const*, unsigned long const&, unsigned int const&))
>>> referenced 35 more times

ld.lld: error: undefined symbol: testing::internal::PrintStringTo(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&, std::ostream*)
>>> referenced by gtest-printers.h:680 (/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/third-party/unittest/googletest/include/gtest/gtest-printers.h:680)
>>>               flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Allocatable.cpp.o:(testing::internal::PrintTo(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&, std::ostream*))

ld.lld: error: undefined symbol: testing::internal::DeathTest::Create(char const*, testing::Matcher<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&>, char const*, int, testing::internal::DeathTest**)
>>> referenced by ArrayConstructor.cpp:156 (/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/flang-rt/unittests/Runtime/ArrayConstructor.cpp:156)
>>>               flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/ArrayConstructor.cpp.o:(ArrayConstructor_CharacterRuntimeCheck_Test::TestBody())
>>> referenced by Format.cpp:156 (/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/flang-rt/unittests/Runtime/Format.cpp:156)
>>>               flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Format.cpp.o:(InvalidFormatFailure_ParenMismatch_Test::TestBody())
>>> referenced by Format.cpp:169 (/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/flang-rt/unittests/Runtime/Format.cpp:169)
>>>               flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Format.cpp.o:(InvalidFormatFailure_MissingPrecision_Test::TestBody())
>>> referenced 33 more times

ld.lld: error: undefined symbol: testing::internal::FormatMatcherDescription(bool, char const*, std::vector<char const*, std::allocator<char const*>> const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>>> const&)
>>> referenced by Complex.cpp:75 (/home/tcwg-buildbot/worker/flang-aarch64-debug-reverse-iteration/llvm-project/flang-rt/unittests/Runtime/Complex.cpp:75)

```

</details>

https://github.com/llvm/llvm-project/pull/154447