[cfe-dev] LLVM ERROR: Program used external function '??_7type_info@@6B@' which could not be resolved!

[David Majnemer via cfe-dev]

On Wed, Jun 8, 2016 at 2:52 AM, Stammerjohann, Kai via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hi,
>
> When I try to run this code via lli:
>
> #include <stdio.h>
>
> int main()
> {
>     try
>     {
>         throw "hi";
>     }
>     catch (const char *msg)
>     {
>         printf("%s\n", msg);
>     }
>     return 0;
> }
>
> It works as expected on linux but fails on windows:
> LLVM ERROR: Program used external function '??_7type_info@@6B@' which
> could not be resolved!
>
> This is what I execute:
>         clang -fexceptions -c -emit-llvm a.cpp
>         lli a.bc
>
> I guess "??_7type_info@@6B@" (aka "const type_info::`vftable'") comes
> from libcmt.lib and would require link.exe to resolve.
> type_info sounds like RTTI, but disabling (-fno-rtti) doesn't it fix the
> problem, I guess it's a requirement for exceptionhandling?
>

Exception handling relies on RTTI and controls different, but related,
machinery from -fno-rtti.


>
> Is there a way to use gnu exception handling on windows generated bitcode?


Yes, you could use a mingw triple.



> For my usecase, its perfectly fine to break compatibility to microsoft
> binaries (I tried to run clang with various targettriples, but didn't get
> it to work)
>
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