[cfe-dev] Compile source files to ELF files under Windows

[Marcus Johnson via cfe-dev]

Why do you want to use the ELF format with the MS ABI?

> On May 27, 2021, at 3:25 AM, Gaier, Bjoern via cfe-dev <cfe-dev at lists.llvm.org> wrote:
> 
> 
> Hey everyone,
>  
> I currently try to compile a few .cpp files under Windows with Clang-Cl, not targeting the COFF format, but instead I want to create ELF files. I do want to use the Microsoft headers and ABI, I just don't want to get COFF files in the end. So I tried the following target:
> --target=x86_64-pc-windows-elf
>  
> From my understanding, I thought this should be correct? Sadly however Clang-Cl failes with:
> 1>fatal error: error in backend: invalid llvm.linker.options
> ------------------------------------------------------------------------
>  
> Instead I compiled the source file to an IR file to figure out what "invalid llvm.linker.options" might be and got:
> !llvm.linker.options = !{!0}
> !llvm.dependent-libraries = !{!1, !2}
> !llvm.module.flags = !{!3, !4, !5}
> !llvm.ident = !{!6}
>  
> !0 = !{!"/FAILIFMISMATCH:\22_CRT_STDIO_ISO_WIDE_SPECIFIERS=0\22"}
> !1 = !{!"msvcrt"}
> !2 = !{!"oldnames"}
> !3 = !{i32 1, !"wchar_size", i32 2}
> !4 = !{i32 7, !"PIC Level", i32 2}
> !5 = !{i32 7, !"uwtable", i32 1}
> !6 = !{!"clang version 13.0.0 (https://github.com/llvm/llvm-project.git 5f500d73cd1aaff4c9ab2fd5c327c2d5ca9ae5c9)"}
>  
> I assume "/FAILIFMISMATCH" is not supported for ELF files?
> Is there a workaround for this issue or is it simply not possible to do what I wanted to do?
>  
> Kind greetings
> Björn
>  
>  
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