wasm rust support

README.md

@@ -477,6 +477,15 @@ RUN xx-cargo build --release --target-dir ./build && \
     xx-verify ./build/$(xx-cargo --print-target-triple)/release/hello_cargo
 ```
 
+### WebAssembly
+
+`xx-cargo` can also be used to build WebAssembly targets. Use platform `wasi/wasm` on your builds for `xx` to pick up the correct configuration. If your code is compatible you can use identical Dockerfile to build Linux and WebAssembly containers.
+
+When using multi-stage builds to copy build results to other stages, note that Rust adds ".wasm" suffix to the binaries built with
+WebAssembly.
+
+Only Rust builds are supported at the moment. To build C/C++ code for WebAssembly using `xx-clang` your Dockerfile needs to set up Wasi Sysroot and `libclang-rt` itself. 
+
 ## External SDK support
 
 In addition to Linux targets, `xx` can also build binaries for MacOS and Windows. When building MacOS binaries from C, external MacOS SDK is needed in `/xx-sdk` directory. Such SDK can be built, for example, with [gen_sdk_package script in osxcross project](https://github.com/tpoechtrager/osxcross/blob/master/tools/gen_sdk_package.sh). Please consult XCode license terms when making such an image. `RUN --mount` syntax can be used in Dockerfile in order to avoid copying SDK files. No special tooling such as `ld64` linker is required in the image itself.

base/test-cargo.bats

@@ -30,9 +30,13 @@ testHelloCargo() {
   assert_success
   run xx-cargo build --verbose --color=never --manifest-path=./fixtures/hello_cargo/Cargo.toml --release --target-dir /tmp/cargobuild
   assert_success
-  xx-verify /tmp/cargobuild/$(xx-cargo --print-target-triple)/release/hello_cargo
+
+  if [ "$TARGETARCH" = "wasm" ]; then
+    sfx=".wasm"
+  fi
+  xx-verify /tmp/cargobuild/$(xx-cargo --print-target-triple)/release/hello_cargo$sfx
   if ! xx-info is-cross; then
-    run /tmp/cargobuild/$(xx-cargo --print-target-triple)/release/hello_cargo
+    run /tmp/cargobuild/$(xx-cargo --print-target-triple)/release/hello_cargo$sfx
     assert_success
     assert_output "hello cargo"
   fi
@@ -87,6 +91,14 @@ testHelloCargoRustup() {
   testHelloCargoRustup
 }
 
+@test "wasm-hellocargo-rustup" {
+  export TARGETARCH=wasm
+  export TARGETOS=wasi
+  testHelloCargoRustup
+  unset TARGETOS
+  unset TARGETARCH
+}
+
 @test "uninstall-rustup" {
   export PATH="$HOME/.cargo/bin:$PATH"
   rustup self uninstall -y

base/test-info-alpine.bats

@@ -98,6 +98,13 @@ load 'assert'
   assert_equal "mips64le" "$(TARGETPLATFORM=linux/mips64le xx-info pkg-arch)"
 }
 
+@test "wasm" {
+  assert_equal "wasm32-alpine-wasi" "$(TARGETPLATFORM=wasi/wasm xx-info triple)"
+  assert_equal "wasm64-alpine-wasi" "$(TARGETPLATFORM=wasi/wasm64 xx-info triple)"
+  assert_equal "wasm32-alpine-wasi" "$(TARGETPLATFORM=wasi/wasm32 xx-info triple)"
+  assert_equal "wasm32" "$(TARGETPLATFORM=linux/wasm xx-info pkg-arch)"
+}
+
 @test "darwin" {
   assert_equal "x86_64-apple-macos10.6" "$(TARGETPLATFORM=darwin/amd64 xx-info triple)"
   assert_equal "darwin" "$(TARGETPLATFORM=darwin/amd64 xx-info os)"

base/test-info-debian.bats

@@ -97,6 +97,13 @@ fi
   assert_equal "mips64el" "$(TARGETPLATFORM=linux/mips64le xx-info pkg-arch)"
 }
 
+@test "wasm" {
+  assert_equal "wasm32-wasi" "$(TARGETPLATFORM=wasi/wasm xx-info triple)"
+  assert_equal "wasm64-wasi" "$(TARGETPLATFORM=wasi/wasm64 xx-info triple)"
+  assert_equal "wasm32-wasi" "$(TARGETPLATFORM=wasi/wasm32 xx-info triple)"
+  assert_equal "wasm32" "$(TARGETPLATFORM=linux/wasm xx-info pkg-arch)"
+}
+
 @test "sysroot" {
   assert_equal "/" "$(xx-info sysroot)"
   assert_equal "/" "$(TARGETPLATFORM=linux/amd64 xx-info sysroot)"

base/xx-cargo

@@ -55,10 +55,11 @@ fi
 vendor=$XX_VENDOR
 if [ -n "$rustup" ] || [ ! -f /etc/alpine-release ]; then
   export XX_VENDOR="unknown"
+  export XX_RUSTUP=1 # this sets the correct target triple for rust libraries for subsequent calls
 fi
 
 if [ ! -f "$done_file" ]; then
-  xx-clang --setup-target-triple
+  XX_RUSTUP="" xx-clang --setup-target-triple
   if [ ! -d "$(rustc --print sysroot)/lib/rustlib/$(xx-info)" ]; then
     if [ -n "$rustup" ]; then
       execSilent rustup target add "$(xx-info)"
@@ -73,13 +74,20 @@ if [ ! -f "$done_file" ]; then
   touch "$done_file"
 fi
 
-export "CARGO_TARGET_$(xx-info | tr '[:lower:]' '[:upper:]' | tr - _)_LINKER=$(xx-info)-clang"
+export "CARGO_TARGET_$(xx-info | tr '[:lower:]' '[:upper:]' | tr - _)_LINKER=$(XX_RUSTUP='' XX_VENDOR='' xx-info)-clang"
 if [ -n "$XX_RUSTFLAGS" ]; then
   export "CARGO_TARGET_$(xx-info | tr '[:lower:]' '[:upper:]' | tr - _)_RUSTFLAGS=$XX_RUSTFLAGS"
 fi
-export "CC_$(xx-info | tr - _)=$(xx-info)-clang"
+export "CC_$(xx-info | tr - _)=$(XX_RUSTUP='' XX_VENDOR='' xx-info)-clang"
 
-if which "qemu-$(RISCV64_TARGET_ARCH='' ARM_TARGET_ARCH='' xx-info march)" >/dev/null 2>&1; then
+if xx-info is-cross; then
+  nativeRustTriple="$(TARGETPLATFORM='' TARGETPAIR='' TARGETOS='' TARGETARCH='' TARGETVARIANT='' xx-info)"
+  nativeClangTriple="$(TARGETPLATFORM='' TARGETPAIR='' TARGETOS='' TARGETARCH='' TARGETVARIANT='' XX_RUSTUP='' XX_VENDOR='' xx-clang --print-target-triple)"
+  export "CARGO_TARGET_$(echo "$nativeRustTriple" | tr '[:lower:]' '[:upper:]' | tr - _)_LINKER=$nativeClangTriple-clang"
+  export "CC_$(echo "$nativeRustTriple" | tr - _)=$nativeClangTriple-clang"
+fi
+
+if which "qemu-$(RISCV64_TARGET_ARCH='' ARM_TARGET_ARCH='' xx-info march)" >/dev/null 2>&1 && [ "$XX_OS" = "linux" ]; then
   export "CARGO_TARGET_$(xx-info | tr '[:lower:]' '[:upper:]' | tr - _)_RUNNER=qemu-$(RISCV64_TARGET_ARCH='' ARM_TARGET_ARCH='' xx-info march)"
   if [ -f /etc/alpine-release ]; then
     export "QEMU_LD_PREFIX=/$(RISCV64_TARGET_ARCH='' ARM_TARGET_ARCH='' xx-info)/"

base/xx-info

@@ -110,7 +110,9 @@ distro=""
 # shellcheck disable=SC1091
 if . /etc/os-release 2>/dev/null; then
   distro=$ID
-  XX_OS_VERSION=$VERSION_ID
+  if [ "$TARGETOS" = "linux" ] || [ "$TARGETOS" = "" ]; then
+    XX_OS_VERSION=$VERSION_ID
+  fi
 fi
 
 vendor=""
@@ -130,6 +132,10 @@ case "$XX_VENDOR" in
   *) vendor="-${XX_VENDOR}" ;;
 esac
 
+if [ -n "$XX_RUSTUP" ] && [ "$TARGETOS" = "wasi" ]; then
+  vendor=""
+fi
+
 if [ -z "$XX_LIBC" ]; then
   if [ "$distro" = "alpine" ]; then
     XX_LIBC="musl"
@@ -139,6 +145,9 @@ if [ -z "$XX_LIBC" ]; then
   if [ "$TARGETOS" = "windows" ]; then
     XX_LIBC="mingw32"
   fi
+  if [ "$TARGETOS" = "wasi" ]; then
+    XX_LIBC=""
+  fi
 fi
 
 # reverse lookup if no parameters given
@@ -208,6 +217,11 @@ if [ "$TARGETOS" = "darwin" ] && [ -z "$MACOSX_VERSION_MIN" ]; then
   fi
 fi
 
+# normalize wasm because early implementation didn't have strict convention
+if [ "$TARGETARCH" = "wasm32" ]; then
+  TARGETARCH="wasm"
+fi
+
 case "$TARGETARCH" in
   "amd64")
     XX_MARCH="x86_64"
@@ -337,6 +351,26 @@ case "$TARGETARCH" in
     XX_RHEL_ARCH="mips64el"
     XX_TRIPLE="mips64el${vendor}-linux-${XX_LIBC}abi64"
     ;;
+  "wasm")
+    XX_MARCH="wasm32"
+    XX_DEBIAN_ARCH="wasm32"
+    XX_ALPINE_ARCH="wasm32"
+    XX_RHEL_ARCH="wasm32"
+    XX_TRIPLE="wasm32${vendor}-unknown"
+    if [ "$TARGETOS" = "wasi" ]; then
+      XX_TRIPLE="wasm32${vendor}-wasi"
+    fi
+    ;;
+  "wasm64")
+    XX_MARCH="wasm64"
+    XX_DEBIAN_ARCH="wasm64"
+    XX_ALPINE_ARCH="wasm64"
+    XX_RHEL_ARCH="wasm64"
+    XX_TRIPLE="wasm64${vendor}-unknown"
+    if [ "$TARGETOS" = "wasi" ]; then
+      XX_TRIPLE="wasm64${vendor}-wasi"
+    fi
+    ;;
 esac
 
 XX_PKG_ARCH=$TARGETARCH
@@ -395,7 +429,7 @@ case "$1" in
     echo "$XX_VENDOR"
     ;;
   "libc") # this is not abi, just the prefix
-    echo $XX_LIBC
+    echo "$XX_LIBC"
     ;;
   "env")
     echo "XX_OS=${TARGETOS}"

base/xx-verify

@@ -112,6 +112,9 @@ for f in "$@"; do
     "windows")
       expOS="MS Windows"
       ;;
+    "wasi")
+      expOS="WebAssembly"
+      ;;
   esac
 
   if [ -z "$expOS" ]; then
@@ -226,6 +229,9 @@ for f in "$@"; do
         expArch2="32-bit LSB"
       fi
       ;;
+    "wasm" | "wasm64")
+      expArch="WebAssembly"
+      ;;
   esac
 
   if [ -z "$expArch" ]; then