Update to LLVM 20.1.8. (#545)

Update from LLVM 20.1.1 to 20.1.8. This release contains various bug
fixes and notably for wasi-sdk includes llvm/llvm-project#146574, which
fixes inline asm vector operands.

RELEASING.md

@@ -1,5 +1,11 @@
 # Release Process
 
+We (maintainers) plan to release a new version of wasi-sdk every three months,
+coinciding with our monthly meeting to discuss latest issues and pull requests.
+This provides regularity to the release cadence, though we also reserve the
+right to publish at any intervening time if there is a pressing need (i.e., open
+an issue to discuss).
+
 To publish a new version of `wasi-sdk` as a GitHub release:
 
 1. Tag a commit with an annotated tag. Note that this must be an annotated tag,

cmake/wasi-sdk-sysroot.cmake

@@ -164,6 +164,12 @@ function(define_wasi_libc_sub target target_suffix lto)
     "${CMAKE_C_FLAGS} ${directory_cflags} ${CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE_UPPER}}")
   list(JOIN extra_cflags_list " " extra_cflags)
 
+  if(${target} MATCHES threads)
+    set(libcompiler_rt_a ${wasi_resource_dir}/lib/wasm32-unknown-wasip1-threads/libclang_rt.builtins.a)
+  else()
+    set(libcompiler_rt_a ${wasi_resource_dir}/lib/wasm32-unknown-wasip1/libclang_rt.builtins.a)
+  endif()
+
   ExternalProject_Add(wasi-libc-${target}${target_suffix}-build
     # Currently wasi-libc doesn't support out-of-tree builds so feign a
     # "download command" which copies the source tree to a different location
@@ -180,6 +186,7 @@ function(define_wasi_libc_sub target target_suffix lto)
         SYSROOT=${wasi_sysroot}
         EXTRA_CFLAGS=${extra_cflags}
         TARGET_TRIPLE=${target}
+        BUILTINS_LIB=${libcompiler_rt_a}
         ${extra_make_flags}
     INSTALL_COMMAND ""
     DEPENDS compiler-rt

cmake/wasi-sdk-toolchain.cmake

@@ -118,7 +118,7 @@ install(DIRECTORY ${wasi_tmp_install}/bin ${wasi_tmp_install}/lib ${wasi_tmp_ins
 # Build logic for `wasm-component-ld` installed from Rust code.
 set(wasm_component_ld_root ${CMAKE_CURRENT_BINARY_DIR}/wasm-component-ld)
 set(wasm_component_ld ${wasm_component_ld_root}/bin/wasm-component-ld${CMAKE_EXECUTABLE_SUFFIX})
-set(wasm_component_ld_version 0.5.13)
+set(wasm_component_ld_version 0.5.14)
 if(RUST_TARGET)
   set(rust_target_flag --target=${RUST_TARGET})
 endif()

src/llvm-project

@@ -1 +1 @@
-Subproject commit 424c2d9b7e4de40d0804dd374721e6411c27d1d1
+Subproject commit 87f0227cb60147a26a1eeb4fb06e3b505e9c7261

src/wasi-libc

@@ -1 +1 @@
-Subproject commit 640c0cfc19a96b099e0791824be5ef0105ce2084
+Subproject commit 50ae11904df674fecaa311537967fe138c21fcc7