Use Joel's test build of WASI-SDK with dylib support for building the engine

Also produce relocatable code for Rust libraries and update to Rust 1.75 toolchain

Author: tschneidereit

.github/workflows/main.yml

@@ -31,6 +31,9 @@ jobs:
       run: |
         mkdir dist
         sudo apt-get update -y
+        wget --no-verbose https://github.com/dicej/wasi-sdk/releases/download/filesystem-fix-v3/wasi-sdk-20.25g964191c91aac-linux.tar.gz
+        tar -xf wasi-sdk-20.25g964191c91aac-linux.tar.gz
+        export WASI_SDK_PREFIX=$PWD/wasi-sdk-20.25g964191c91aac
         bash ./build-engine.sh release
         tar -a -cf dist/spidermonkey-wasm-static-lib_release.tar.gz release
         rm -rf release obj-release

build-engine.sh

@@ -29,6 +29,11 @@ ac_add_options --enable-portable-baseline-interp
 ac_add_options --prefix=${working_dir}/${objdir}/dist
 mk_add_options MOZ_OBJDIR=${working_dir}/${objdir}
 mk_add_options AUTOCLOBBER=1
+export RUSTFLAGS="-C relocation-model=pic"
+export RUSTC_BOOTSTRAP=1
+export CFLAGS="-fPIC"
+export CXXFLAGS="-fPIC"
+
 EOF
 
 target="$(uname)"
@@ -105,6 +110,15 @@ python3 \
 
 cd "$working_dir"
 
+if [[ -z "${WASI_SDK_PREFIX}" ]]; then
+  echo "WASI_SDK_PREFIX not set, using default compiler and sysroot"
+else
+  mv ~/.mozbuild/clang ~/.mozbuild/clang.orig
+  mv ~/.mozbuild/sysroot-wasm32-wasi ~/.mozbuild/sysroot-wasm32-wasi.orig
+  ln -s "${WASI_SDK_PREFIX}" ~/.mozbuild/clang
+  ln -s "${WASI_SDK_PREFIX}/share/wasi-sysroot" ~/.mozbuild/sysroot-wasm32-wasi
+fi
+
 # Build SpiderMonkey for WASI
 MOZCONFIG="${mozconfig}" \
 MOZ_FETCHES_DIR=~/.mozbuild \

rust-toolchain.toml

@@ -1,4 +1,4 @@
 [toolchain]
-channel = "1.68.2"
+channel = "1.75"
 targets = [ "wasm32-wasi" ]
 profile = "minimal"