[clang] Revert "[C++20][Modules] Improve namespace look-up performance for modules. (#171769)" (PR #174783)

LLVM Continuous Integration via cfe-commits cfe-commits at lists.llvm.org
Wed Jan 7 09:51:57 PST 2026 

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-gcc-ubuntu` running on `sie-linux-worker3` while building `clang` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/174/builds/29746

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

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'lld :: COFF/linkreprofullpathrsp.test' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 3
rm -rf /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.dir /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.obj
# executed command: rm -rf /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.dir /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.obj
# note: command had no output on stdout or stderr
# RUN: at line 4
/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/yaml2obj /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF/Inputs/hello32.yaml -o /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.obj
# executed command: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/yaml2obj /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF/Inputs/hello32.yaml -o /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.obj
# note: command had no output on stdout or stderr
# RUN: at line 5
/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/yaml2obj /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF/Inputs/empty.yaml -o /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.archive.obj
# executed command: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/yaml2obj /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF/Inputs/empty.yaml -o /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.archive.obj
# note: command had no output on stdout or stderr
# RUN: at line 6
rm -f /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.archive.lib
# executed command: rm -f /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.archive.lib
# note: command had no output on stdout or stderr
# RUN: at line 7
llvm-ar rcs /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.archive.lib /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.archive.obj
# executed command: llvm-ar rcs /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.archive.lib /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.archive.obj
# note: command had no output on stdout or stderr
# RUN: at line 8
/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/llvm-pdbutil yaml2pdb /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF/Inputs/pdb-type-server-simple-ts.yaml -pdb /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.pdb
# executed command: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/llvm-pdbutil yaml2pdb /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF/Inputs/pdb-type-server-simple-ts.yaml -pdb /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.pdb
# note: command had no output on stdout or stderr
# RUN: at line 12
mkdir -p /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.dir/build1
# executed command: mkdir -p /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.dir/build1
# note: command had no output on stdout or stderr
# RUN: at line 13
cd /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.dir/build1
# executed command: cd /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.dir/build1
# note: command had no output on stdout or stderr
# RUN: at line 14
/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/lld-link /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.obj /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF/Inputs/std32.lib /subsystem:console /defaultlib:/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF/Inputs/library.lib   /libpath:/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF/Inputs /defaultlib:std64.lib ret42.lib /entry:main at 0 /linkreprofullpathrsp:/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.rsp   /wholearchive:/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.archive.lib /out:/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.exe /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.pdb
# executed command: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/lld-link /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.obj /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF/Inputs/std32.lib /subsystem:console /defaultlib:/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF/Inputs/library.lib /libpath:/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF/Inputs /defaultlib:std64.lib ret42.lib /entry:main at 0 /linkreprofullpathrsp:/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.rsp /wholearchive:/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.archive.lib /out:/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.exe /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.pdb
# note: command had no output on stdout or stderr
# RUN: at line 17
/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF/linkreprofullpathrsp.test --check-prefix=RSP -DT=/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp -DP=/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF < /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.rsp
# executed command: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF/linkreprofullpathrsp.test --check-prefix=RSP -DT=/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp -DP=/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/COFF
# note: command had no output on stdout or stderr
# RUN: at line 19
/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/lld-link @/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.rsp /out:/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp2.exe /entry:main at 0
# executed command: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/lld-link @/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp.rsp /out:/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/COFF/Output/linkreprofullpathrsp.test.tmp2.exe /entry:main at 0
# note: command had no output on stdout or stderr
# RUN: at line 20
...

```

</details>

https://github.com/llvm/llvm-project/pull/174783

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