`-Wdangling-reference` reported in `llvm/utils/TableGen/GlobalISelCombinerEmitter.cpp`

[firewave]

/home/user/CLionProjects/llvm-project/llvm/utils/TableGen/GlobalISelCombinerEmitter.cpp: In member function ‘bool {anonymous}::CombineRuleBuilder::emitCXXMatchApply(llvm::CodeExpansions&, llvm::gi::RuleMatcher&, llvm::ArrayRef<llvm::gi::CXXPattern*>)’:
/home/user/CLionProjects/llvm-project/llvm/utils/TableGen/GlobalISelCombinerEmitter.cpp:1910:15: warning: possibly dangling reference to a temporary [-Wdangling-reference]
 1910 |   const auto &Code = CXXPredicateCode::getCustomActionCode(CodeStr);
      |               ^~~~
/home/user/CLionProjects/llvm-project/llvm/utils/TableGen/GlobalISelCombinerEmitter.cpp:1910:59: note: the temporary was destroyed at the end of the full expression ‘llvm::gi::CXXPredicateCode::getCustomActionCode(std::__cxx11::basic_string<char>(CodeStr))’
 1910 |   const auto &Code = CXXPredicateCode::getCustomActionCode(CodeStr);
      |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~

I am using gcc (GCC) 14.2.1 20240910 on Manjaro Linux.

[chrchr-github]

Looks like a false positive from GCC,
The returned const reference points into the AllCXXCustomActionCode parameter, which is a static object

static const CXXPredicateCode &getCustomActionCode(std::string Code) {
    return get(AllCXXCustomActionCode, std::move(Code));
  }

[firewave]

Well, it does say "warning: possibly dangling reference to a temporary"...