[clang] Emitting VTables across multiple TUs. Make them weak. (PR #200942)
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Mon Jun 1 14:53:38 PDT 2026
github-actions[bot] wrote:
<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results
* 54080 tests passed
* 1275 tests skipped
* 1 test failed
## Failed Tests
(click on a test name to see its output)
### Clang
<details>
<summary>Clang.OpenMP/target_vtable_codegen_explicit.cpp</summary>
```
Exit Code: 1
Command Output (stdout):
--
# RUN: at line 1
c:\_work\llvm-project\llvm-project\build\bin\clang.exe -cc1 -internal-isystem C:\_work\llvm-project\llvm-project\build\lib\clang\23\include -nostdsysteminc -verify -fopenmp -Wno-openmp-mapping -x c++ -triple x86_64-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -fopenmp-cuda-mode -emit-llvm-bc C:\_work\llvm-project\llvm-project\clang\test\OpenMP\target_vtable_codegen_explicit.cpp -o C:\_work\llvm-project\llvm-project\build\tools\clang\test\OpenMP\Output\target_vtable_codegen_explicit.cpp.tmp-ppc-host.bc -fopenmp-version=52
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\clang.exe' -cc1 -internal-isystem 'C:\_work\llvm-project\llvm-project\build\lib\clang\23\include' -nostdsysteminc -verify -fopenmp -Wno-openmp-mapping -x c++ -triple x86_64-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -fopenmp-cuda-mode -emit-llvm-bc 'C:\_work\llvm-project\llvm-project\clang\test\OpenMP\target_vtable_codegen_explicit.cpp' -o 'C:\_work\llvm-project\llvm-project\build\tools\clang\test\OpenMP\Output\target_vtable_codegen_explicit.cpp.tmp-ppc-host.bc' -fopenmp-version=52
# note: command had no output on stdout or stderr
# RUN: at line 2
c:\_work\llvm-project\llvm-project\build\bin\clang.exe -cc1 -internal-isystem C:\_work\llvm-project\llvm-project\build\lib\clang\23\include -nostdsysteminc -verify -fopenmp -Wno-openmp-mapping -x c++ -triple nvptx64-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -fopenmp-cuda-mode -emit-llvm C:\_work\llvm-project\llvm-project\clang\test\OpenMP\target_vtable_codegen_explicit.cpp -fopenmp-is-target-device -fopenmp-host-ir-file-path C:\_work\llvm-project\llvm-project\build\tools\clang\test\OpenMP\Output\target_vtable_codegen_explicit.cpp.tmp-ppc-host.bc -o - -debug-info-kind=limited -fopenmp-version=52 | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe --allow-unused-prefixes C:\_work\llvm-project\llvm-project\clang\test\OpenMP\target_vtable_codegen_explicit.cpp
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\clang.exe' -cc1 -internal-isystem 'C:\_work\llvm-project\llvm-project\build\lib\clang\23\include' -nostdsysteminc -verify -fopenmp -Wno-openmp-mapping -x c++ -triple nvptx64-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -fopenmp-cuda-mode -emit-llvm 'C:\_work\llvm-project\llvm-project\clang\test\OpenMP\target_vtable_codegen_explicit.cpp' -fopenmp-is-target-device -fopenmp-host-ir-file-path 'C:\_work\llvm-project\llvm-project\build\tools\clang\test\OpenMP\Output\target_vtable_codegen_explicit.cpp.tmp-ppc-host.bc' -o - -debug-info-kind=limited -fopenmp-version=52
# note: command had no output on stdout or stderr
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' --allow-unused-prefixes 'C:\_work\llvm-project\llvm-project\clang\test\OpenMP\target_vtable_codegen_explicit.cpp'
# .---command stderr------------
# | C:\_work\llvm-project\llvm-project\clang\test\OpenMP\target_vtable_codegen_explicit.cpp:21:11: error: CHECK: expected string not found in input
# | // CHECK: @_ZTV7Derived = linkonce_odr constant { [6 x ptr] }
# | ^
# | <stdin>:31:27: note: scanning from here
# | $_ZTV7Derived = comdat any
# | ^
# | <stdin>:40:1: note: possible intended match here
# | @_ZTV7Derived = weak_odr constant { [6 x ptr] } { [6 x ptr] [ptr null, ptr null, ptr @_ZN7DerivedD1Ev, ptr @_ZN7DerivedD0Ev, ptr @_ZN7Derived5BaseAEi, ptr @_ZN7Derived8DerivedBEv] }, comdat, align 8, !dbg !0
# | ^
# |
# | Input file: <stdin>
# | Check file: C:\_work\llvm-project\llvm-project\clang\test\OpenMP\target_vtable_codegen_explicit.cpp
# |
# | -dump-input=help explains the following input dump.
# |
# | Input was:
# | <<<<<<
# | .
# | .
# | .
# | 26:
# | 27: $_ZN7DerivedD2Ev = comdat any
# | 28:
# | 29: $_ZN4BaseD2Ev = comdat any
# | 30:
# | 31: $_ZTV7Derived = comdat any
# | check:21'0 X error: no match found
# | 32:
# | check:21'0 ~
# | 33: $_ZTV4Base = comdat any
# | check:21'0 ~~~~~~~~~~~~~~~~~~~~~~~~
# | 34:
# | check:21'0 ~
# | 35: @__omp_rtl_debug_kind = weak_odr hidden constant i32 0
# | check:21'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | 36: @__omp_rtl_assume_teams_oversubscription = weak_odr hidden constant i32 0
# | check:21'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | 37: @__omp_rtl_assume_threads_oversubscription = weak_odr hidden constant i32 0
# | check:21'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | 38: @__omp_rtl_assume_no_thread_state = weak_odr hidden constant i32 0
# | check:21'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | 39: @__omp_rtl_assume_no_nested_parallelism = weak_odr hidden constant i32 0
# | check:21'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | 40: @_ZTV7Derived = weak_odr constant { [6 x ptr] } { [6 x ptr] [ptr null, ptr null, ptr @_ZN7DerivedD1Ev, ptr @_ZN7DerivedD0Ev, ptr @_ZN7Derived5BaseAEi, ptr @_ZN7Derived8DerivedBEv] }, comdat, align 8, !dbg !0
# | check:21'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | check:21'1 ? possible intended match
# | 41: @__omp_offloading_7e4838ac_cc2e8337__ZTV7Derived_l36addr = protected constant ptr @_ZTV7Derived
# | check:21'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | 42: @_ZTV4Base = weak_odr constant { [5 x ptr] } { [5 x ptr] [ptr null, ptr null, ptr @_ZN4BaseD1Ev, ptr @_ZN4BaseD0Ev, ptr @_ZN4Base5BaseAEi] }, comdat, align 8, !dbg !5
# | check:21'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | 43: @__omp_offloading_7e4838ac_cc2e8337__ZTV4Base_l36addr = protected constant ptr @_ZTV4Base
# | check:21'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | 44: @0 = private unnamed_addr constant [148 x i8] c";C:\\_work\\llvm-project\\llvm-project\\clang\\test\\OpenMP\\target_vtable_codegen_explicit.cpp;__omp_offloading_7e4838ac_cc2e8337_main_l42_debug__;43;6;;\00", align 1
# | check:21'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | 45: @1 = private unnamed_addr constant %struct.ident_t { i32 0, i32 2, i32 0, i32 147, ptr @0 }, align 8
# | check:21'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | .
# | .
# | .
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1
--
```
</details>
If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.
https://github.com/llvm/llvm-project/pull/200942
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