GCC warning:
```
/llvm-project/llvm/lib/MC/ELFObjectWriter.cpp: In member function ‘void {anonymous}::ELFWriter::writeHeader(const llvm::MCAssembler&)’:
/llvm-project/llvm/lib/MC/ELFObjectWriter.cpp:421:20: warning: enumeral and non-enumeral type in conditional expression [-Wextra]
420 | W.OS << char(OSABI == ELF::ELFOSABI_NONE && OWriter.seenGnuAbi()
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
421 | ? ELF::ELFOSABI_GNU
| ^~~~~~~~~~~~~~~~~~~
422 | : OSABI);
| ~~~~~~~
```
// e_ident[EI_OSABI]
uint8_t OSABI = OWriter.TargetObjectWriter->getOSABI();
W.OS << char(OSABI == ELF::ELFOSABI_NONE && OWriter.seenGnuAbi()
- ? ELF::ELFOSABI_GNU
+ ? int(ELF::ELFOSABI_GNU)
: OSABI);
// e_ident[EI_ABIVERSION]
W.OS << char(OWriter.TargetObjectWriter->getABIVersion());