[WASM] Fix building on Linux

Author: kateinoigakukun

cmake/caches/Runtime-WASI-wasm32.cmake

@@ -1,5 +1,7 @@
 set(SWIFT_PRIMARY_VARIANT_SDK WASI CACHE STRING "")
 set(SWIFT_PRIMARY_VARIANT_ARCH wasm32 CACHE STRING "")
+set(SWIFT_HOST_VARIANT_SDK NONE CACHE STRING "")
+set(SWIFT_HOST_VARIANT_ARCH NONE CACHE STRING "")
 
 set(SWIFT_SDKS WASI CACHE STRING "")
 
@@ -17,6 +19,9 @@ set(SWIFTWASM_DISABLE_REFLECTION_TEST YES CACHE BOOL "")
 set(SWIFT_BUILD_STATIC_STDLIB YES CACHE BOOL "")
 set(SWIFT_BUILD_DYNAMIC_STDLIB NO CACHE BOOL "")
 set(SWIFT_ENABLE_EXPERIMENTAL_CONCURRENCY NO CACHE BOOL "")
+# TODO(katei): This should get turned off, as this is not an ABI stable platform.
+# But current CMake build system doesn't support SWIFT_STDLIB_STABLE_ABI=NO
+set(SWIFT_STDLIB_STABLE_ABI YES CACHE BOOL "")
 
 # build with the host compiler
 set(SWIFT_BUILD_RUNTIME_WITH_HOST_COMPILER YES CACHE BOOL "")

utils/webassembly/build-toolchain.sh

@@ -113,6 +113,9 @@ build_target_toolchain() {
   mkdir -p "$SWIFT_STDLIB_BUILD_DIR/lib/clang/10.0.0/"
   ln -fs "$COMPILER_RT_BUILD_DIR/lib" "$SWIFT_STDLIB_BUILD_DIR/lib/clang/10.0.0/lib"
 
+  # Remove host CoreFoundation module directory to avoid module conflict
+  # while building Foundation
+  rm -rf "$DIST_TOOLCHAIN_SDK/usr/lib/swift_static/CoreFoundation"
   "$UTILS_PATH/build-foundation.sh" "$DIST_TOOLCHAIN_SDK"
   "$UTILS_PATH/build-xctest.sh" "$DIST_TOOLCHAIN_SDK"