Added wasi-sdk flow

eng/Versions.props

@@ -8,4 +8,7 @@
   <PropertyGroup>
     <MicrosoftDotNetBuildTasksPackagingVersion>8.0.0-beta.23067.5</MicrosoftDotNetBuildTasksPackagingVersion>
   </PropertyGroup>
+  <PropertyGroup>
+    <WasiSdkVersion>16</WasiSdkVersion> 
+  </PropertyGroup>
 </Project>

eng/azure-pipelines.yml

@@ -77,6 +77,51 @@ stages:
             artifactName: Artifacts_Browser_Threading
             condition: and(succeeded(), ne(variables['System.TeamProject'], 'public'), ne(variables['Build.Reason'], 'PullRequest'))
 
+      ############ WASI BUILD ############
+      - job: Build_Wasi
+        displayName: Wasi
+        timeoutInMinutes: 360
+        pool:
+          ${{ if eq(variables['System.TeamProject'], 'public') }}:
+            vmImage: ubuntu-20.04
+          ${{ if eq(variables['System.TeamProject'], 'internal') }}:
+            name: NetCore1ESPool-Internal
+            demands: ImageOverride -equals Build.Ubuntu.1804.Amd64
+        container:
+          image: mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-20.04-webassembly
+        steps:
+        - bash: |
+            ./build.sh --ci --restore --build --configuration $(_BuildConfig) /p:TargetOS=Wasi /p:TargetArchitecture=wasm $(_InternalBuildArgs)
+          displayName: Build
+        - task: PublishPipelineArtifact@1
+          displayName: Upload artifacts
+          inputs:
+            targetPath: 'artifacts/bin'
+            artifactName: Artifacts_Wasi
+            condition: and(succeeded(), ne(variables['System.TeamProject'], 'public'), ne(variables['Build.Reason'], 'PullRequest'))
+
+      - job: Build_Wasi_Threading
+        displayName: Wasi_Threading
+        timeoutInMinutes: 360
+        pool:
+          ${{ if eq(variables['System.TeamProject'], 'public') }}:
+            vmImage: ubuntu-20.04
+          ${{ if eq(variables['System.TeamProject'], 'internal') }}:
+            name: NetCore1ESPool-Internal
+            demands: ImageOverride -equals Build.Ubuntu.1804.Amd64
+        container:
+          image: mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-20.04-webassembly
+        steps:
+        - bash: |
+            ./build.sh --ci --restore --build --configuration $(_BuildConfig) /p:TargetOS=Wasi /p:TargetArchitecture=wasm /p:WasmEnableThreads=true $(_InternalBuildArgs)
+          displayName: Build
+        - task: PublishPipelineArtifact@1
+          displayName: Upload artifacts
+          inputs:
+            targetPath: 'artifacts/bin'
+            artifactName: Artifacts_Wasi_Threading
+            condition: and(succeeded(), ne(variables['System.TeamProject'], 'public'), ne(variables['Build.Reason'], 'PullRequest'))
+
       ############ iOS BUILD ############
       - job: Build_iOS
         displayName: iOS
@@ -168,6 +213,8 @@ stages:
         dependsOn:
           - Build_Browser
           - Build_Browser_Threading
+          - Build_Wasi
+          - Build_Wasi_Threading
           - Build_iOS
           - Build_MacCatalyst
           - Build_tvOS
@@ -188,6 +235,14 @@ stages:
           inputs:
             artifact: Artifacts_Browser_Threading
             path: 'artifacts/bin/browser-threading'
+        - task: DownloadPipelineArtifact@2
+          inputs:
+            artifact: Artifacts_Wasi
+            path: 'artifacts/bin'
+        - task: DownloadPipelineArtifact@2
+          inputs:
+            artifact: Artifacts_Wasi_Threading
+            path: 'artifacts/bin/wasi-threading'
         - task: DownloadPipelineArtifact@2
           inputs:
             artifact: Artifacts_iOS

eng/icu.mk

@@ -91,8 +91,8 @@ data-$(2): $(TARGET_OBJDIR)/$(1)/.stamp-configure | $(TARGET_OBJDIR)/$(1) $(TARG
 
 endef
 
-ifeq ($(TARGET_OS),browser)
-$(eval $(call TargetBuildTemplate,icudt_browser,icudt))
+ifeq ($(TARGET_ARCHITECTURE),wasm)
+$(eval $(call TargetBuildTemplate,icudt_wasm,icudt))
 else
 $(eval $(call TargetBuildTemplate,icudt_mobile,icudt))
 endif

eng/icu.proj

@@ -1,16 +1,23 @@
 <Project>
-  <Target Name="Build" Condition="'$(PackOnly)' != 'true'" DependsOnTargets="PatchEmscripten;CopyEmscriptenVersion">
+  <Import Project="$(RepositoryEngineeringDir)Versions.props" />
+
+  <Target Name="Build" Condition="'$(PackOnly)' != 'true'" DependsOnTargets="PatchEmscripten;CopyEmscriptenVersion;DownloadWasiSdk">
     <Error Condition="'$(TargetOS)' == ''" Text="TargetOS needs to be specified!" />
     <Error Condition="'$(TargetArchitecture)' == ''" Text="TargetArchitecture needs to be specified!" />
 
     <PropertyGroup>
       <_ExtraParams Condition="'$(WasmEnableThreads)' == 'true'">WASM_ENABLE_THREADS=true</_ExtraParams>
     </PropertyGroup>
 
+    <!-- Set WASI sdk path if WASI_SDK_PATH env variable is not set -->
+    <PropertyGroup Condition="'$(TargetOS)' == 'Wasi' and '$(WASI_SDK_PATH)' == ''">
+      <WASI_SDK_PATH Condition="'$(WASI_SDK_PATH)' == ''">$(RepoRoot)artifacts/wasi-sdk</WASI_SDK_PATH>
+    </PropertyGroup>
+
     <Copy SourceFiles="$(MSBuildThisFileDirectory)\..\icu-filters\curr-root.txt" 
           DestinationFiles="$(MSBuildThisFileDirectory)\..\icu\icu4c\source\data\curr\root.txt"/> 
     <Exec WorkingDirectory="$(MSBuildThisFileDirectory)"
-          Command="make -f icu.mk all TARGET_OS=$(TargetOS.ToLower()) TARGET_ARCHITECTURE=$(TargetArchitecture) ICU_TRACING=$(IcuTracing) $(_ExtraParams) SHELL=/bin/bash"
+          Command="make -f icu.mk all TARGET_OS=$(TargetOS.ToLower()) TARGET_ARCHITECTURE=$(TargetArchitecture) ICU_TRACING=$(IcuTracing) WASI_SDK_PATH=$(WASI_SDK_PATH) $(_ExtraParams) SHELL=/bin/bash"
           IgnoreStandardErrorWarningFormat="true" />
   </Target>
   <Target Name="Restore" />
@@ -37,4 +44,19 @@
             Lines="@(_ItemsFromEmscriptenVersionFile->Replace('&quot;', ''))"
             Overwrite="true" />
   </Target>
+
+  <!-- Download WASI sdk if WASI_SDK_PATH env variable is not set -->
+  <Target Name="DownloadWasiSdk" Condition="'$(TargetOS)' == 'Wasi'  and '$(WASI_SDK_PATH)' == ''">
+    <PropertyGroup>
+      <_WasiLocalPath>$(RepoRoot)\artifacts</_WasiLocalPath>
+      <_WasiSdkUrl Condition="$([MSBuild]::IsOSPlatform('Linux'))">https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-$(WasiSdkVersion)/wasi-sdk-$(WasiSdkVersion).0-linux.tar.gz</_WasiSdkUrl>
+      <_WasiSdkUrl Condition="$([MSBuild]::IsOSPlatform('OSX'))">https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-$(WasiSdkVersion)/wasi-sdk-$(WasiSdkVersion).0-macos.tar.gz</_WasiSdkUrl>
+    </PropertyGroup>
+
+    <Error Condition="'$(_WasiSdkUrl)' == ''" Text="_WasiSdkUrl is not set!" />
+
+    <Exec Command="rm -rf wasi-sdk-*/ wasi-sdk/ &amp;&amp; curl -L -o- $(_WasiSdkUrl) --fail -S | tar -xvz &amp;&amp; mv wasi-sdk-$(WasiSdkVersion).*/ wasi-sdk/"
+          WorkingDirectory="$(_WasiLocalPath)"
+          IgnoreStandardErrorWarningFormat="true" />
+  </Target>
 </Project>

eng/icu.wasi.mk

@@ -0,0 +1,29 @@
+# TODO: add other host platform/arch combinations
+UNAME_S := $(shell uname -s)
+UNAME_M := $(shell uname -m)
+UNAME_R := $(shell uname -r)
+
+ifeq ($(UNAME_S),Linux)
+	HOST_PLATFORM=x86_64-pc-linux-gnu
+endif
+ifeq ($(UNAME_S),Darwin)
+	ifeq ($(UNAME_M),arm64)
+		HOST_PLATFORM=arm64-apple-darwin$(UNAME_R)
+	endif
+	ifeq ($(UNAME_M),x86_64)
+		HOST_PLATFORM=x86_64-apple-darwin$(UNAME_R)
+	endif
+endif
+ifeq ($(WASM_ENABLE_THREADS),true)
+	THREADS_FLAG="-pthread"
+endif
+
+CONFIGURE_COMPILER_FLAGS += \
+	CFLAGS="-Oz -fno-exceptions -Wno-sign-compare $(THREADS_FLAG) $(ICU_DEFINES)" \
+	CXXFLAGS="-Oz -fno-exceptions -Wno-sign-compare $(THREADS_FLAG) $(ICU_DEFINES)" \
+	CC="$(WASI_SDK_PATH)/bin/clang --sysroot=$(WASI_SDK_PATH)/share/wasi-sysroot" \
+	CXX="$(WASI_SDK_PATH)/bin/clang++ --sysroot=$(WASI_SDK_PATH)/share/wasi-sysroot" \
+	--host=$(HOST_PLATFORM) --build=wasm32
+
+check-env:
+	: