[llvm-dev] No Targets in TargetRegistry

[Alexander Benikowski via llvm-dev]

Not sure. But when doing this in the C-Api, you've to initialize/add the
Targets first. It'll not run with all buildin-targets by default.
As an example: LLVMInitializeX86Target
<http://llvm.org/doxygen/X86TargetMachine_8cpp_source.html#l00068>
This is for the C-API, so i think similar things apply to the C++ API the
C-API is based on.

2018-01-20 22:32 GMT+01:00 Brent Lewis via llvm-dev <llvm-dev at lists.llvm.org
>:

> This is from https://stackoverflow.com/questions/48360685/no-targets-
> in-targetregistry
>
> I have the following code, which should get the default llvm::Target.
>
>     auto const targetTriple = llvm::sys::getDefaultTargetTriple();
>     llvm_module.setTargetTriple(targetTriple);
>     std::string error;
>     auto const * target = llvm::TargetRegistry::lookupTarget(targetTriple,
> error);
>     if (target == nullptr) {
>         auto targets = llvm::TargetRegistry::targets();
>         size_t targetCount = 0;
>         for (auto const & _ : targets) {
>             ++targetCount;
>         }
>         ERROR(Unknown, "llvm::TargetRegistry::lookupTarget failed for " +
> targetTriple + ". llvm::TargetRegistry::targets() contains " +
> std::to_string(targetCount) + " elements.");
>     }
>
> This code produces this error message:
>
> ...
> llvm::TargetRegistry::lookupTarget failed for i686-pc-windows-msvc.
> llvm::TargetRegistry::targets() contains 0 elements
> ...
>
> Am I missing a step?
>
>
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