Trying things

native/linux/build.cake

@@ -15,11 +15,17 @@ string AR = Argument("ar", EnvironmentVariable("AR"));
 
 string VARIANT = BUILD_VARIANT ?? "linux";
 
+if (BUILD_ARCH.Length == 0)
+    BUILD_ARCH = new [] { "x64" };
+
 Task("libSkiaSharp")
     .IsDependentOn("git-sync-deps")
     .WithCriteria(IsRunningOnLinux())
     .Does(() =>
 {
+    foreach (var ARCH in BUILD_ARCH) {
+        if (Skip(ARCH)) return;
+
         var COMPILERS = "";
         if (!string.IsNullOrEmpty(CC))
             COMPILERS += $"cc='{CC}' ";
@@ -28,18 +34,12 @@ Task("libSkiaSharp")
         if (!string.IsNullOrEmpty(AR))
             COMPILERS += $"ar='{AR}' ";
 
-    Build("x64", "x64", "x64");
-
-    void Build(string arch, string skiaArch, string dir)
-    {
-        if (Skip(arch)) return;
-
         var soname = GetVersion("libSkiaSharp", "soname");
         var map = MakeAbsolute((FilePath)"libSkiaSharp/libSkiaSharp.map");
 
-        GnNinja($"{VARIANT}/{arch}", "SkiaSharp",
+        GnNinja($"{VARIANT}/{ARCH}", "SkiaSharp",
             $"target_os='linux' " +
-            $"target_cpu='{arch}' " +
+            $"target_cpu='{ARCH}' " +
             $"is_official_build=true " +
             $"skia_enable_gpu={(SUPPORT_GPU ? "true" : "false")} " +
             $"skia_enable_tools=false " +
@@ -53,15 +53,16 @@ Task("libSkiaSharp")
             $"skia_use_system_libwebp=false " +
             $"skia_use_system_zlib=false " +
             $"skia_use_vulkan={SUPPORT_VULKAN} ".ToLower () +
+            $"extra_asmflags=[] " +
             $"extra_cflags=[ '-DSKIA_C_DLL', '-DHAVE_SYSCALL_GETRANDOM', '-DXML_DEV_URANDOM' ] " +
             $"extra_ldflags=[ '-static-libstdc++', '-static-libgcc', '-Wl,--version-script={map}' ] " +
             COMPILERS +
             $"linux_soname_version='{soname}' " +
             ADDITIONAL_GN_ARGS);
 
-        var outDir = OUTPUT_PATH.Combine($"{VARIANT}/{dir}");
+        var outDir = OUTPUT_PATH.Combine($"{VARIANT}/{ARCH}");
         EnsureDirectoryExists(outDir);
-        var so = SKIA_PATH.CombineWithFilePath($"out/{VARIANT}/{arch}/libSkiaSharp.so.{soname}");
+        var so = SKIA_PATH.CombineWithFilePath($"out/{VARIANT}/{ARCH}/libSkiaSharp.so.{soname}");
         CopyFileToDirectory(so, outDir);
         CopyFile(so, outDir.CombineWithFilePath("libSkiaSharp.so"));
     }
@@ -71,28 +72,25 @@ Task("libHarfBuzzSharp")
     .WithCriteria(IsRunningOnLinux())
     .Does(() =>
 {
+    foreach (var ARCH in BUILD_ARCH) {
+        if (Skip(ARCH)) return;
+
         var COMPILERS = "";
         if (!string.IsNullOrEmpty(CC))
             COMPILERS += $"CC='{CC}' ";
         if (!string.IsNullOrEmpty(CXX))
             COMPILERS += $"CXX='{CXX}' ";
 
-    Build("x64", "x64");
-
-    void Build(string arch, string dir)
-    {
-        if (Skip(arch)) return;
-
         var soname = GetVersion("HarfBuzz", "soname");
 
         RunProcess("make", new ProcessSettings {
-            Arguments = $"{COMPILERS} ARCH={arch} SONAME_VERSION={soname} VARIANT={VARIANT} LDFLAGS=-static-libstdc++",
+            Arguments = $"{COMPILERS} ARCH={ARCH} SONAME_VERSION={soname} VARIANT={VARIANT} LDFLAGS=-static-libstdc++",
             WorkingDirectory = "libHarfBuzzSharp",
         });
 
-        var outDir = OUTPUT_PATH.Combine($"{VARIANT}/{dir}");
+        var outDir = OUTPUT_PATH.Combine($"{VARIANT}/{ARCH}");
         EnsureDirectoryExists(outDir);
-        var so = $"libHarfBuzzSharp/bin/{VARIANT}/{arch}/libHarfBuzzSharp.so.{soname}";
+        var so = $"libHarfBuzzSharp/bin/{VARIANT}/{ARCH}/libHarfBuzzSharp.so.{soname}";
         CopyFileToDirectory(so, outDir);
         CopyFile(so, outDir.CombineWithFilePath("libHarfBuzzSharp.so"));
     }

native/linuxarm/build.cake

@@ -0,0 +1,51 @@
+DirectoryPath ROOT_PATH = MakeAbsolute(Directory("../.."));
+DirectoryPath OUTPUT_PATH = MakeAbsolute(ROOT_PATH.Combine("output/native"));
+
+#load "../../cake/shared.cake"
+
+var BUILD_VARIANT = Argument("variant", EnvironmentVariable("BUILD_VARIANT") ?? "linux");
+OUTPUT_PATH = OUTPUT_PATH.Combine(BUILD_VARIANT);
+
+Task("libSkiaSharp")
+    .WithCriteria(IsRunningOnLinux())
+    .Does(() =>
+{
+    var sysroot = "/usr/arm-linux-gnueabihf";
+    var target = "armv7a-linux-gnueabihf";
+
+    RunCake("../linux/build.cake", "libSkiaSharp", new Dictionary<string, string> {
+        { "variant", BUILD_VARIANT },
+        { "arch", "arm" },
+        { "gnArgs",
+            $"skia_use_fontconfig=false " + // TEMP:
+            $"extra_asmflags+=[ '--sysroot={sysroot}', '--target={target}',  '-mfloat-abi=hard', '-march=armv7-a', '-mfpu=neon', '-mthumb' ] " +
+            $"extra_cflags+=[   '--sysroot={sysroot}', '--target={target}',  '-mfloat-abi=hard', '-march=armv7-a', '-mfpu=neon', '-mthumb', '-I/usr/arm-linux-gnueabihf/include', '-I/usr/arm-linux-gnueabihf/include/c++/4.8.5', '-I/usr/arm-linux-gnueabihf/include/c++/4.8.5/arm-linux-gnueabihf' ] " +
+            $"extra_ldflags+=[  '--sysroot={sysroot}', '--target={target}' , '-mfloat-abi=hard', '-march=armv7-a', '-mfpu=neon', '-mthumb'] "
+        },
+    });
+
+    RunProcess("ldd", OUTPUT_PATH.CombineWithFilePath($"x64/libSkiaSharp.so").FullPath, out var stdout);
+
+    if (stdout.Any(o => o.Contains("fontconfig")))
+        throw new Exception("libSkiaSharp.so contained a dependency on fontconfig.");
+});
+
+Task("libHarfBuzzSharp")
+    .WithCriteria(IsRunningOnLinux())
+    .Does(() =>
+{
+    RunCake("../linux/build.cake", "libHarfBuzzSharp", new Dictionary<string, string> {
+        { "variant", BUILD_VARIANT },
+    });
+
+    RunProcess("ldd", OUTPUT_PATH.CombineWithFilePath($"x64/libHarfBuzzSharp.so").FullPath, out var stdout);
+
+    if (stdout.Any(o => o.Contains("fontconfig")))
+        throw new Exception("libHarfBuzzSharp.so contained a dependency on fontconfig.");
+});
+
+Task("Default")
+    .IsDependentOn("libSkiaSharp")
+    .IsDependentOn("libHarfBuzzSharp");
+
+RunTarget(TARGET);

scripts/Docker/ubuntu16/armhf/Dockerfile

@@ -0,0 +1,18 @@
+FROM amd64/ubuntu:16.04
+
+RUN apt-get update \
+    && apt-get install -y apt-transport-https curl wget \
+    && apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF \
+    && echo "deb https://download.mono-project.com/repo/ubuntu stable-xenial/snapshots/6.4.0 main" | tee /etc/apt/sources.list.d/mono-official-stable.list \
+    && curl -L https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add - \
+    && echo "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-10 main" | tee /etc/apt/sources.list.d/llvm.list \
+    && apt-get update \
+    && apt-get install -y mono-complete msbuild python git libfontconfig1-dev clang-10 make \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN apt-get update
+RUN apt-get install -y libstdc++-4.8-dev-armhf-cross libgcc-4.8-dev-armhf-cross binutils-arm-linux-gnueabihf
+
+ENV CC=clang-10 CXX=clang++-10
+
+WORKDIR /work