Add build for linux-armv6 RID (#22)

Fixes https://github.com/mono/mono.posix/issues/20

build.sh

@@ -198,6 +198,7 @@ function __build_host()
 		build_common ${HOST_BUILD_NAME}-x64 -DTARGET_PLATFORM=host-${OS_LOWER}-x64
 		build_common ${HOST_BUILD_NAME}-arm64 -DTARGET_PLATFORM=host-${OS_LOWER}-arm64
 		build_common ${HOST_BUILD_NAME}-arm -DTARGET_PLATFORM=host-${OS_LOWER}-arm
+		build_common ${HOST_BUILD_NAME}-armv6 -DTARGET_PLATFORM=host-${OS_LOWER}-armv6
 	fi
 
 	HOST_BUILT="yes"
@@ -327,6 +328,7 @@ function __build_test()
 			i686) die 32-bit x86 Linux build not supported ;;
 			x86_64) arch="-x64" ;;
 			armv7l) arch="-arm32" ;;
+			armv6l) arch="-armv6" ;;
 			arm64) arch="-arm64" ;;
 			*) die "Unknown Linux host architecture: $(arch)" ;;
 		esac

ci/azure-pipelines.yaml

@@ -47,6 +47,12 @@ stages:
         archiveName: '$(LinuxHostArm32ArchiveName)'
         displayName: 'Archive Linux host ARM32 (Hard Float) build'
 
+    - template: templates/pack-artifact.yaml
+      parameters:
+        buildDir: '$(LinuxHostArmv6BuildDir)'
+        archiveName: '$(LinuxHostArmv6ArchiveName)'
+        displayName: 'Archive Linux host ARMv6 build'
+
     - task: PublishBuildArtifacts@1
       displayName: Upload Artifacts
       inputs:
@@ -397,6 +403,13 @@ stages:
             archiveName: '$(LinuxHostArm32ArchiveName)'
             destinationFolder: '$(LinuxHostArm32BuildDir)'
 
+        - template: /ci/templates/extract-artifact.yaml
+          parameters:
+            displayName: Extract Linux host ARMv6 build
+            artifactName: 'Host'
+            archiveName: '$(LinuxHostArmv6ArchiveName)'
+            destinationFolder: '$(LinuxHostArmv6BuildDir)'
+
         - template: /ci/templates/extract-artifact.yaml
           parameters:
             displayName: Extract macOS arm64 host build

ci/common-variables.yml

@@ -58,6 +58,10 @@ variables:
     value: $(LinuxHostBuildDirBase)-arm-release/lib
   - name: LinuxHostArm32ArchiveName
     value: $(LinuxHostArchiveNameBase)-arm
+  - name: LinuxHostArmv6BuildDir
+    value: $(LinuxHostBuildDirBase)-armv6-release/lib
+  - name: LinuxHostArmv6ArchiveName
+    value: $(LinuxHostArchiveNameBase)-armv6
 
   # Android
   - name: AndroidArchiveNameBase

cmake/toolchain.linux.cmake

@@ -6,6 +6,9 @@ if(TARGET_PLATFORM MATCHES "^host-linux-.*")
   elseif(TARGET_PLATFORM STREQUAL host-linux-arm)
     set(CMAKE_SYSTEM_PROCESSOR armv7l)
     set(TRIPLE "arm-linux-gnueabihf" CACHE STRING "" FORCE)
+  elseif(TARGET_PLATFORM STREQUAL host-linux-armv6)
+    set(CMAKE_SYSTEM_PROCESSOR armv6l)
+    set(TRIPLE "arm-linux-gnueabihf" CACHE STRING "" FORCE)
   else()
     set(IS_CROSS_BUILD False)
     set(TRIPLE "" CACHE STRING "" FORCE)

src/Mono.Unix/Mono.Unix.proj

@@ -57,6 +57,16 @@
       <HasSharedLibrary>true</HasSharedLibrary>
     </_NativeLib>
 
+    <_NativeLib Include="host-linux-armv6" Condition=" '$([MSBuild]::IsOSPlatform(Linux))' == 'true' or '$(PackageAllNativeLibs)' == 'true' ">
+      <RuntimeIdentifier>linux-armv6</RuntimeIdentifier>
+      <LibraryPrefix>$(_LinuxLibraryPrefix)</LibraryPrefix>
+      <SharedSuffix>$(_LinuxSharedNativeLibrarySuffix)</SharedSuffix>
+      <StaticSuffix>$(_LinuxStaticNativeLibrarySuffix)</StaticSuffix>
+      <DebugSuffix>$(_LinuxDebugNativeLibrarySuffix)</DebugSuffix>
+      <HasDebugLibrary>$(_LinuxHasDebugNativeLibrary)</HasDebugLibrary>
+      <HasSharedLibrary>true</HasSharedLibrary>
+    </_NativeLib>
+
     <_NativeLib Include="host-darwin-x64" Condition=" '$([MSBuild]::IsOSPlatform(OSX))' == 'true' or '$(PackageAllNativeLibs)' == 'true' ">
       <RuntimeIdentifier>osx-x64</RuntimeIdentifier>
       <LibraryPrefix>$(_DarwinLibraryPrefix)</LibraryPrefix>

src/Mono.Unix/Mono.Unix.targets

@@ -29,6 +29,10 @@
       <DSOExtension>so</DSOExtension>
       <FolderName>%(Identity)</FolderName>
     </_MonoUnixRuntimeId>
+    <_MonoUnixRuntimeId Include="linux-armv6">
+      <DSOExtension>so</DSOExtension>
+      <FolderName>%(Identity)</FolderName>
+    </_MonoUnixRuntimeId>
     <_MonoUnixRuntimeId Include="osx-arm64">
       <DSOExtension>dylib</DSOExtension>
       <FolderName>%(Identity)</FolderName>