[clang] [clang] fix transform for constant template parameter type subst node (PR #162587)

Wed Oct 8 20:47:00 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-m68k-linux-cross` running on `suse-gary-m68k-cross` while building `clang` at step 4 "build stage 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/27/builds/17252

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

```
Step 4 (build stage 1) failure: 'ninja' (failure)
...
[183/1372] Building CXX object tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseStmt.cpp.o
[184/1372] Building CXX object tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseTemplate.cpp.o
[185/1372] Building CXX object tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaOverload.cpp.o
[186/1372] Building CXX object tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaType.cpp.o
[187/1372] Building CXX object tools/clang/lib/Serialization/CMakeFiles/obj.clangSerialization.dir/TemplateArgumentHasher.cpp.o
[188/1372] Building CXX object tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/Parser.cpp.o
[189/1372] Building CXX object tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseOpenACC.cpp.o
[190/1372] Building CXX object tools/clang/lib/Parse/CMakeFiles/obj.clangParse.dir/ParseOpenMP.cpp.o
[191/1372] Building CXX object tools/clang/lib/Serialization/CMakeFiles/obj.clangSerialization.dir/GeneratePCH.cpp.o
[192/1372] Building CXX object tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaExpr.cpp.o
FAILED: tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaExpr.cpp.o 
/usr/bin/c++ -DCLANG_EXPORTS -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/tools/clang/lib/Sema -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/lib/Sema -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/include -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/tools/clang/include -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/include -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-dangling-reference -Wno-redundant-move -Wno-pessimizing-move -Wno-array-bounds -Wno-stringop-overread -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -Wno-pass-failed -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -O3 -DNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaExpr.cpp.o -MF tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaExpr.cpp.o.d -o tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaExpr.cpp.o -c /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/lib/Sema/SemaExpr.cpp
c++: fatal error: Killed signal terminated program cc1plus
compilation terminated.
[193/1372] Building CXX object tools/clang/lib/Frontend/CMakeFiles/obj.clangFrontend.dir/ASTMerge.cpp.o
[194/1372] Building CXX object tools/clang/lib/Frontend/CMakeFiles/obj.clangFrontend.dir/CreateInvocationFromCommandLine.cpp.o
[195/1372] Building CXX object tools/clang/lib/Index/CMakeFiles/obj.clangIndex.dir/FileIndexRecord.cpp.o
[196/1372] Building CXX object tools/clang/lib/Frontend/CMakeFiles/obj.clangFrontend.dir/DependencyFile.cpp.o
[197/1372] Building CXX object tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaTemplateDeductionGuide.cpp.o
[198/1372] Building CXX object tools/clang/lib/Frontend/CMakeFiles/obj.clangFrontend.dir/ChainedIncludesSource.cpp.o
[199/1372] Building CXX object tools/clang/lib/Serialization/CMakeFiles/obj.clangSerialization.dir/ASTReaderStmt.cpp.o
[200/1372] Building CXX object tools/clang/lib/Frontend/CMakeFiles/obj.clangFrontend.dir/ModuleDependencyCollector.cpp.o
[201/1372] Building CXX object tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaSYCL.cpp.o
[202/1372] Building CXX object tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaDecl.cpp.o
[203/1372] Building CXX object tools/clang/lib/Serialization/CMakeFiles/obj.clangSerialization.dir/ASTWriterStmt.cpp.o
[204/1372] Building CXX object tools/clang/lib/Frontend/CMakeFiles/obj.clangFrontend.dir/TestModuleFileExtension.cpp.o
[205/1372] Building CXX object tools/clang/lib/Serialization/CMakeFiles/obj.clangSerialization.dir/ASTWriterDecl.cpp.o
[206/1372] Building CXX object tools/clang/lib/Frontend/CMakeFiles/obj.clangFrontend.dir/InitPreprocessor.cpp.o
[207/1372] Building CXX object tools/clang/lib/Index/CMakeFiles/obj.clangIndex.dir/IndexDecl.cpp.o
[208/1372] Building CXX object tools/clang/lib/Frontend/CMakeFiles/obj.clangFrontend.dir/PrecompiledPreamble.cpp.o
[209/1372] Building CXX object tools/clang/lib/Frontend/CMakeFiles/obj.clangFrontend.dir/FrontendAction.cpp.o
[210/1372] Building CXX object tools/clang/lib/Frontend/CMakeFiles/obj.clangFrontend.dir/CompilerInstance.cpp.o
[211/1372] Building CXX object tools/clang/lib/Frontend/CMakeFiles/obj.clangFrontend.dir/FrontendActions.cpp.o
[212/1372] Building CXX object tools/clang/lib/Frontend/CMakeFiles/obj.clangFrontend.dir/ASTUnit.cpp.o
[213/1372] Building CXX object tools/clang/lib/Serialization/CMakeFiles/obj.clangSerialization.dir/ASTReaderDecl.cpp.o
[214/1372] Building CXX object tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaConcept.cpp.o
[215/1372] Building CXX object tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaTemplateDeduction.cpp.o
In file included from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/lib/Sema/TreeTransform.h:48,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/lib/Sema/SemaTemplateDeduction.cpp:13:
In constructor ‘clang::LocalInstantiationScope::LocalInstantiationScope(clang::Sema&, bool, bool)’,
    inlined from ‘clang::TemplateDeductionResult clang::Sema::DeduceTemplateArguments(clang::FunctionTemplateDecl*, clang::TemplateArgumentListInfo*, llvm::ArrayRef<clang::Expr*>, clang::FunctionDecl*&, clang::sema::TemplateDeductionInfo&, bool, bool, bool, clang::QualType, clang::Expr::Classification, bool, llvm::function_ref<bool(llvm::ArrayRef<clang::QualType>, bool)>)’ at /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/lib/Sema/SemaTemplateDeduction.cpp:4558:42:
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/include/clang/Sema/Template.h:442:41: warning: storing the address of local variable ‘InstScope’ in ‘*this.clang::Sema::CurrentInstantiationScope’ [-Wdangling-pointer=]
  442 |       SemaRef.CurrentInstantiationScope = this;
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/lib/Sema/SemaTemplateDeduction.cpp: In member function ‘clang::TemplateDeductionResult clang::Sema::DeduceTemplateArguments(clang::FunctionTemplateDecl*, clang::TemplateArgumentListInfo*, llvm::ArrayRef<clang::Expr*>, clang::FunctionDecl*&, clang::sema::TemplateDeductionInfo&, bool, bool, bool, clang::QualType, clang::Expr::Classification, bool, llvm::function_ref<bool(llvm::ArrayRef<clang::QualType>, bool)>)’:
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/lib/Sema/SemaTemplateDeduction.cpp:4558:27: note: ‘InstScope’ declared here
 4558 |   LocalInstantiationScope InstScope(*this);
      |                           ^~~~~~~~~
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/lib/Sema/SemaTemplateDeduction.cpp:4517:73: note: ‘this’ declared here

```

</details>

https://github.com/llvm/llvm-project/pull/162587