[clang] [clang-tools-extra] [clang] Improve nested name specifier AST representation (PR #147835)

Sat Aug 9 01:42:32 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-aarch64-ubuntu` running on `linaro-lldb-aarch64-ubuntu` while building `clang-tools-extra,clang,libcxx,lldb` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/59/builds/22354

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

```
Step 6 (test) failure: build (failure)
...
UNSUPPORTED: lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/u8string_view/TestDataFormatterStdU8StringView.py (413 of 2304)
UNSUPPORTED: lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/valarray/TestDataFormatterStdValarray.py (414 of 2304)
PASS: lldb-api :: functionalities/completion/TestCompletion.py (415 of 2304)
PASS: lldb-api :: functionalities/data-formatter/data-formatter-stl/libcxx-simulators/invalid-vector/TestDataFormatterLibcxxInvalidVectorSimulator.py (416 of 2304)
PASS: lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/vbool/TestDataFormatterStdVBool.py (417 of 2304)
PASS: lldb-api :: functionalities/data-formatter/data-formatter-stl/libcxx-simulators/optional/TestDataFormatterLibcxxOptionalSimulator.py (418 of 2304)
PASS: lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/unique_ptr/TestDataFormatterStdUniquePtr.py (419 of 2304)
UNSUPPORTED: lldb-api :: functionalities/data-formatter/data-formatter-stl/libcxx/invalid-string/TestDataFormatterLibcxxInvalidString.py (420 of 2304)
PASS: lldb-api :: functionalities/data-formatter/data-formatter-stl/libcxx-simulators/unique_ptr/TestDataFormatterLibcxxUniquePtrSimulator.py (421 of 2304)
PASS: lldb-api :: functionalities/data-formatter/data-formatter-stl/libstdcpp/invalid-variant/TestDataFormatterInvalidStdVariant.py (422 of 2304)
FAIL: lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/string/TestDataFormatterStdString.py (423 of 2304)
******************** TEST 'lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/string/TestDataFormatterStdString.py' FAILED ********************
Script:
--
/usr/bin/python3.10 /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/dotest.py -u CXXFLAGS -u CFLAGS --env LLVM_LIBS_DIR=/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./lib --env LLVM_INCLUDE_DIR=/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/include --env LLVM_TOOLS_DIR=/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin --arch aarch64 --build-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build.noindex --lldb-module-cache-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build.noindex/module-cache-lldb/lldb-api --clang-module-cache-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build.noindex/module-cache-clang/lldb-api --executable /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/lldb --compiler /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/clang --dsymutil /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/dsymutil --make /usr/bin/gmake --llvm-tools-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin --lldb-obj-root /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/tools/lldb --lldb-libs-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./lib --cmake-build-type Release /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/string -p TestDataFormatterStdString.py
--
Exit Code: 1

Command Output (stdout):
--
lldb version 22.0.0git (https://github.com/llvm/llvm-project.git revision 91cdd35008e9ab32dffb7e401cdd7313b3461892)
  clang revision 91cdd35008e9ab32dffb7e401cdd7313b3461892
  llvm revision 91cdd35008e9ab32dffb7e401cdd7313b3461892
Skipping the following test categories: ['libc++', 'msvcstl', 'dsym', 'gmodules', 'debugserver', 'objc']

--
Command Output (stderr):
--
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_embedded_null_libcxx_dsym (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_embedded_null_libcxx_dwarf (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_embedded_null_libcxx_dwo (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_embedded_null_libstdcxx_dsym (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
XFAIL: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_embedded_null_libstdcxx_dwarf (TestDataFormatterStdString.StdStringDataFormatterTestCase)
XFAIL: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_embedded_null_libstdcxx_dwo (TestDataFormatterStdString.StdStringDataFormatterTestCase)
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_embedded_null_msvc_dsym (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_embedded_null_msvc_dwarf (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_embedded_null_msvc_dwo (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_libcxx_dsym (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_libcxx_dwarf (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_libcxx_dwo (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_libstdcxx_dsym (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
PASS: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_libstdcxx_dwarf (TestDataFormatterStdString.StdStringDataFormatterTestCase)
PASS: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_libstdcxx_dwo (TestDataFormatterStdString.StdStringDataFormatterTestCase)
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_msvc_dsym (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_msvc_dwarf (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_msvc_dwo (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_multibyte_libcxx_dsym (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_multibyte_libcxx_dwarf (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_multibyte_libcxx_dwo (TestDataFormatterStdString.StdStringDataFormatterTestCase) (test case does not fall in any category of interest for this run) 

```

</details>

https://github.com/llvm/llvm-project/pull/147835