[stdlib] Unable to compile for `riscv64-unknown-linux-gnu`

[colemancda]

Description

The Swift Std library fails to compile for RISCV64, with the error /workspaces/buildroot/output/build/swift-6.0.3/include/swift/ABI/Metadata.h:85:50: error: 'swift_context' parameter can only be used with swiftcall or swiftasynccall calling convention

Reproduction

Compile the Swift Std Library for riscv64-unknown-linux-gnu. I have Buildroot scripts setup to cross compile, but it should be reproducible building on host as well.

Expected behavior

The Swift Std library should compile for RISCV64

Environment

Swift version 6.0.3 (swift-6.0.3-RELEASE)
Target: x86_64-unknown-linux-gnu

Additional information

swift-6.0.3-riscv64-compile.log

[finagolfin]

@futurejones, are you seeing this too?

[colemancda]

This patch applied to LLVM seems to resolve that specific error
0001-clang-Added-Swift-support-for-RISCV64.patch

[colemancda]

Now I am getting another error with those patches applied.

cannot guarantee tail call due to mismatched parameter counts
  musttail call swiftcc void @"$ss23withCheckedContinuation9isolation8function_xScA_pSgYi_SSyScCyxs5NeverOGXEtYalF.1"(ptr @"$ss23withCheckedContinuation9isolation8function_xScA_pSgYi_SSyScCyxs5NeverOGXEtYalFTY0_", i64 %39, i64 %40, ptr %1)
<unknown>:0: error: fatal error encountered during compilation; please submit a bug report (https://swift.org/contributing/#reporting-bugs)
<unknown>:0: note: Broken function

riscv64-tail-call-crash.log