| Issue |
137600
|
| Summary |
`-Wpreferred-type-bitfield-enum-conversion` reported in `include/clang/Basic/LangOptions.def`
|
| Labels |
code-quality
|
| Assignees |
|
| Reporter |
firewave
|
Doing a downstream `include-what-you-use` with Clang 21 against LLVM 21 shows the following warning:
```
In file included from /mnt/s/GitHub/include-what-you-use/iwyu_globals.cc:22:
In file included from /usr/lib/llvm-21/include/clang/AST/PrettyPrinter.h:17:
In file included from /usr/lib/llvm-21/include/clang/Basic/LangOptions.h:663:
/usr/lib/llvm-21/include/clang/Basic/LangOptions.def:350:1: warning: assigning value of preferred signed enum type 'FPEvalMethodKind' to unsigned bit-field 'FPEvalMethod'; negative enumerators of enum 'FPEvalMethodKind' will be converted to positive values [-Wpreferred-type-bitfield-enum-conversion]
350 | BENIGN_ENUM_LANGOPT(FPEvalMethod, FPEvalMethodKind, 3, FEM_UnsetOnCommandLine, "FP type used for floating point arithmetic")
| ^
/usr/lib/llvm-21/include/clang/Basic/LangOptions.def:67:6: note: expanded from macro 'BENIGN_ENUM_LANGOPT'
67 | COMPATIBLE_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
| ^
/usr/lib/llvm-21/include/clang/Basic/LangOptions.def:62:6: note: expanded from macro 'COMPATIBLE_ENUM_LANGOPT'
62 | ENUM_LANGOPT(Name, Type, Bits, Default, Description)
| ^
/usr/lib/llvm-21/include/clang/Basic/LangOptions.h:661:10: note: expanded from macro 'ENUM_LANGOPT'
661 | Name = static_cast<unsigned>(Value); \
| ^
/usr/lib/llvm-21/include/clang/Basic/LangOptions.def:350:1: note: consider making the bit-field type signed
350 | BENIGN_ENUM_LANGOPT(FPEvalMethod, FPEvalMethodKind, 3, FEM_UnsetOnCommandLine, "FP type used for floating point arithmetic")
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/llvm-21/include/clang/Basic/LangOptions.def:67:6: note: expanded from macro 'BENIGN_ENUM_LANGOPT'
67 | COMPATIBLE_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/llvm-21/include/clang/Basic/LangOptions.def:62:6: note: expanded from macro 'COMPATIBLE_ENUM_LANGOPT'
62 | ENUM_LANGOPT(Name, Type, Bits, Default, Description)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/llvm-21/include/clang/Basic/LangOptions.h:501:3: note: expanded from macro 'ENUM_LANGOPT'
501 | unsigned Name : Bits;
| ^~~~~~~~
/usr/lib/llvm-21/include/clang/Basic/LangOptions.def:350:1: note: preferred type for bit-field 'FPEvalMethodKind' specified here
/usr/lib/llvm-21/include/clang/Basic/LangOptions.def:67:6: note: expanded from macro 'BENIGN_ENUM_LANGOPT'
67 | COMPATIBLE_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
| ^
/usr/lib/llvm-21/include/clang/Basic/LangOptions.def:62:6: note: expanded from macro 'COMPATIBLE_ENUM_LANGOPT'
62 | ENUM_LANGOPT(Name, Type, Bits, Default, Description)
| ^
/usr/lib/llvm-21/include/clang/Basic/LangOptions.h:500:3: note: expanded from macro 'ENUM_LANGOPT'
500 | LLVM_PREFERRED_TYPE(Type) \
| ^
/usr/lib/llvm-21/include/llvm/Support/Compiler.h:708:47: note: expanded from macro 'LLVM_PREFERRED_TYPE'
708 | #define LLVM_PREFERRED_TYPE(T) __attribute__((preferred_type(T)))
| ^
```
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