[wasm32] linux & mingw support

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/LinkStage.kt

@@ -211,8 +211,10 @@ internal open class WasmPlatform(distribution: Distribution)
 
     override fun linkCommand(objectFiles: List<ObjectFile>, executable: ExecutableFile, optimize: Boolean, debug: Boolean, dynamic: Boolean): List<String> {
 
-        //No link stage for WASM yet, just give '.wasm' as output.
-        return mutableListOf("/bin/cp", objectFiles.single(), executable)
+        // No link stage for WASM yet, just give '.wasm' as output.
+        return mutableListOf(
+          *(if (TargetManager.host == KonanTarget.MINGW) arrayOf("${System.getenv("SystemRoot")}/System32/cmd.exe", "/c", "copy") else arrayOf("/bin/cp")),
+          objectFiles.single(), executable)
     }
 }
 

backend.native/konan.properties

@@ -278,6 +278,18 @@ dependencies.osx-wasm32 = \
     target-sysroot-2-wasm \
     target-toolchain-2-osx-wasm
 
+targetToolchain.linux-wasm32 = target-toolchain-1-linux-wasm
+dependencies.linux-wasm32 = \
+    clang-llvm-5.0.0-linux-x86-64 \
+    target-sysroot-2-wasm \
+    target-toolchain-1-linux-wasm
+
+targetToolchain.mingw-wasm32 = target-toolchain-1-mingw-wasm
+dependencies.mingw-wasm32 = \
+    msys2-mingw-w64-x86_64-gcc-7.2.0-clang-llvm-5.0.0-windows-x86-64 \
+    target-sysroot-2-wasm \
+    target-toolchain-1-mingw-wasm
+
 quadruple.wasm32 = wasm32
 llvmLtoFlags.wasm32 =
 targetSysRoot.wasm32 = target-sysroot-2-wasm

shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/KonanTarget.kt

@@ -176,9 +176,11 @@ class TargetManager(val userRequest: String? = null) {
                     KonanTarget.LINUX_MIPSEL32.enabled = true
                     KonanTarget.ANDROID_ARM32.enabled = true
                     KonanTarget.ANDROID_ARM64.enabled = true
+                    KonanTarget.WASM32.enabled = true
                 }
                 KonanTarget.MINGW -> {
                     KonanTarget.MINGW.enabled = true
+                    KonanTarget.WASM32.enabled = true
                 }
                 KonanTarget.MACBOOK -> {
                     KonanTarget.MACBOOK.enabled = true