| Issue |
137603
|
| Summary |
`-Wpreferred-type-bitfield-enum-conversion` reported in `include/clang/Basic/LangOptions.def` (ComplexRange)
|
| Labels |
code-quality
|
| Assignees |
|
| Reporter |
firewave
|
Compiling `include-what-you-use` with Clang 21 against LLVM 20 shows the following:
```
In file included from /mnt/s/GitHub/include-what-you-use/iwyu_globals.cc:22:
In file included from /usr/lib/llvm-20/include/clang/AST/PrettyPrinter.h:17:
In file included from /usr/lib/llvm-20/include/clang/Basic/LangOptions.h:649:
/usr/lib/llvm-20/include/clang/Basic/LangOptions.def:242:1: warning: bit-field 'ComplexRange' is not wide enough to store all enumerators of preferred type 'ComplexRangeKind' [-Wpreferred-type-bitfield-enum-conversion]
242 | ENUM_LANGOPT(ComplexRange, ComplexRangeKind, 2, CX_None, "Enable use of range reduction for complex arithmetics.")
| ^
/usr/lib/llvm-20/include/clang/Basic/LangOptions.h:648:37: note: expanded from macro 'ENUM_LANGOPT'
648 | void set##Name(Type Value) { Name = static_cast<unsigned>(Value); }
| ^
/usr/lib/llvm-20/include/clang/Basic/LangOptions.def:242:46: note: widen this field to 3 bits to store all values of 'ComplexRangeKind'
242 | ENUM_LANGOPT(ComplexRange, ComplexRangeKind, 2, CX_None, "Enable use of range reduction for complex arithmetics.")
| ^
/usr/lib/llvm-20/include/clang/Basic/LangOptions.def:242:1: note: preferred type for bit-field 'ComplexRangeKind' specified here
242 | ENUM_LANGOPT(ComplexRange, ComplexRangeKind, 2, CX_None, "Enable use of range reduction for complex arithmetics.")
| ^
/usr/lib/llvm-20/include/clang/Basic/LangOptions.h:495:3: note: expanded from macro 'ENUM_LANGOPT'
495 | LLVM_PREFERRED_TYPE(Type) \
| ^
/usr/lib/llvm-20/include/llvm/Support/Compiler.h:687:47: note: expanded from macro 'LLVM_PREFERRED_TYPE'
687 | #define LLVM_PREFERRED_TYPE(T) __attribute__((preferred_type(T)))
| ^
```
This does not happen when you compile with Clang 21 against LLVM 21. So this either needs a backport or can be closed as already fixed.
![]()
_______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
