Merge pull request #56555 from matthewbauer/wasm

Initial WebAssembly/WASI cross-compilation support

lib/systems/default.nix

@@ -30,6 +30,7 @@ rec {
       libc =
         /**/ if final.isDarwin              then "libSystem"
         else if final.isMinGW               then "msvcrt"
+        else if final.isWasi                then "wasilibc"
         else if final.isMusl                then "musl"
         else if final.isUClibc              then "uclibc"
         else if final.isAndroid             then "bionic"
@@ -62,7 +63,7 @@ rec {
           "netbsd" = "NetBSD";
           "freebsd" = "FreeBSD";
           "openbsd" = "OpenBSD";
-          "wasm" = "Wasm";
+          "wasi" = "Wasi";
         }.${final.parsed.kernel.name} or null;
 
          # uname -p
@@ -114,8 +115,8 @@ rec {
         then "${wine}/bin/${wine-name}"
         else if final.isLinux && pkgs.stdenv.hostPlatform.isLinux
         then "${qemu-user}/bin/qemu-${final.qemuArch}"
-        else if final.isWasm
-        then "${pkgs.v8}/bin/d8"
+        else if final.isWasi
+        then "${pkgs.wasmtime}/bin/wasmtime"
         else throw "Don't know how to run ${final.config} executables.";
 
     } // mapAttrs (n: v: v final.parsed) inspect.predicates

lib/systems/doubles.nix

@@ -17,6 +17,8 @@ let
     "x86_64-netbsd" "x86_64-openbsd" "x86_64-solaris"
 
     "x86_64-windows" "i686-windows"
+
+    "wasm64-wasi" "wasm32-wasi"
   ];
 
   allParsed = map parse.mkSystemFromString all;
@@ -45,6 +47,7 @@ in rec {
   netbsd  = filterDoubles predicates.isNetBSD;
   openbsd = filterDoubles predicates.isOpenBSD;
   unix    = filterDoubles predicates.isUnix;
+  wasi    = filterDoubles predicates.isWasi;
   windows = filterDoubles predicates.isWindows;
 
   mesaPlatforms = ["i686-linux" "x86_64-linux" "x86_64-darwin" "armv5tel-linux" "armv6l-linux" "armv7l-linux" "armv7a-linux" "aarch64-linux" "powerpc64le-linux"];

lib/systems/examples.nix

@@ -116,7 +116,7 @@ rec {
     config = "aarch64-none-elf";
     libc = "newlib";
   };
-  
+
   aarch64be-embedded = {
     config = "aarch64_be-none-elf";
     libc = "newlib";
@@ -126,7 +126,7 @@ rec {
     config = "powerpc-none-eabi";
     libc = "newlib";
   };
-  
+
   ppcle-embedded = {
     config = "powerpcle-none-eabi";
     libc = "newlib";
@@ -211,4 +211,14 @@ rec {
     config = "x86_64-unknown-netbsd";
     libc = "nblibc";
   };
+
+  #
+  # WASM
+  #
+
+  wasi32 = {
+    config = "wasm32-unknown-wasi";
+    useLLVM = true;
+  };
+
 }

lib/systems/for-meta.nix

@@ -32,6 +32,7 @@ in rec {
   openbsd = [ patterns.isOpenBSD ];
   unix    = patterns.isUnix; # Actually a list
   windows = [ patterns.isWindows ];
+  wasi    = [ patterns.isWasi ];
 
   inherit (lib.systems.doubles) mesaPlatforms;
 }

lib/systems/inspect.nix

@@ -43,6 +43,7 @@ rec {
     isWindows      = { kernel = kernels.windows; };
     isCygwin       = { kernel = kernels.windows; abi = abis.cygnus; };
     isMinGW        = { kernel = kernels.windows; abi = abis.gnu; };
+    isWasi         = { kernel = kernels.wasi; };
 
     isAndroid      = [ { abi = abis.android; } { abi = abis.androideabi; } ];
     isMusl         = with abis; map (a: { abi = a; }) [ musl musleabi musleabihf ];

lib/systems/parse.nix

@@ -226,6 +226,7 @@ rec {
     elf = {};
     macho = {};
     pe = {};
+    wasm = {};
 
     unknown = {};
   };
@@ -268,6 +269,7 @@ rec {
     none    = { execFormat = unknown; families = { }; };
     openbsd = { execFormat = elf;     families = { inherit bsd; }; };
     solaris = { execFormat = elf;     families = { }; };
+    wasi    = { execFormat = wasm;    families = { }; };
     windows = { execFormat = pe;      families = { }; };
   } // { # aliases
     # 'darwin' is the kernel for all of them. We choose macOS by default.
@@ -376,6 +378,8 @@ rec {
         then { cpu = elemAt l 0;                      kernel = elemAt l 1; abi = elemAt l 2; }
       else if (elemAt l 2 == "mingw32") # autotools breaks on -gnu for window
         then { cpu = elemAt l 0; vendor = elemAt l 1; kernel = "windows";                    }
+      else if (elemAt l 2 == "wasi")
+        then { cpu = elemAt l 0; vendor = elemAt l 1; kernel = "wasi";                       }
       else if hasPrefix "netbsd" (elemAt l 2)
         then { cpu = elemAt l 0; vendor = elemAt l 1;    kernel = elemAt l 2;                }
       else if (elem (elemAt l 2) ["eabi" "eabihf" "elf"])

pkgs/build-support/bintools-wrapper/default.nix

@@ -191,7 +191,8 @@ stdenv.mkDerivation {
       else if targetPlatform.isAvr then "avr"
       else if targetPlatform.isAlpha then "alpha"
       else throw "unknown emulation for platform: ${targetPlatform.config}";
-    in targetPlatform.platform.bfdEmulation or (fmt + sep + arch);
+    in if targetPlatform.useLLVM or false then ""
+       else targetPlatform.platform.bfdEmulation or (fmt + sep + arch);
 
   strictDeps = true;
   depsTargetTargetPropagated = extraPackages;

pkgs/build-support/cc-wrapper/default.nix

@@ -347,6 +347,10 @@ stdenv.mkDerivation {
       hardening_unsupported_flags+=" stackprotector fortify"
     ''
 
+    + optionalString targetPlatform.isWasm ''
+      hardening_unsupported_flags+=" stackprotector fortify pie pic"
+    ''
+
     + optionalString (libc != null && targetPlatform.isAvr) ''
       for isa in avr5 avr3 avr4 avr6 avr25 avr31 avr35 avr51 avrxmega2 avrxmega4 avrxmega5 avrxmega6 avrxmega7 tiny-stack; do
         echo "-B${getLib libc}/avr/lib/$isa" >> $out/nix-support/libc-cflags

pkgs/development/compilers/llvm/8/compiler-rt.nix

@@ -19,6 +19,8 @@ stdenv.mkDerivation rec {
     "-DCOMPILER_RT_BUILD_LIBFUZZER=OFF"
     "-DCOMPILER_RT_BUILD_PROFILE=OFF"
     "-DCOMPILER_RT_BAREMETAL_BUILD=ON"
+    #https://stackoverflow.com/questions/53633705/cmake-the-c-compiler-is-not-able-to-compile-a-simple-test-program
+    "-DCMAKE_TRY_COMPILE_TARGET_TYPE=STATIC_LIBRARY"
     "-DCMAKE_SIZEOF_VOID_P=${toString (stdenv.hostPlatform.parsed.cpu.bits / 8)}"
   ] ++ stdenv.lib.optionals stdenv.hostPlatform.isMusl [
     "-DCOMPILER_RT_BUILD_SANITIZERS=OFF"
@@ -53,7 +55,7 @@ stdenv.mkDerivation rec {
   '';
 
   # Hack around weird upsream RPATH bug
-  postInstall = stdenv.lib.optionalString stdenv.isDarwin ''
+  postInstall = stdenv.lib.optionalString (stdenv.hostPlatform.isDarwin || stdenv.hostPlatform.isWasm) ''
     ln -s "$out/lib"/*/* "$out/lib"
   '' + stdenv.lib.optionalString (stdenv.hostPlatform.useLLVM or false) ''
     ln -s $out/lib/*/clang_rt.crtbegin-*.o $out/lib/crtbegin.o

pkgs/development/compilers/llvm/8/default.nix

@@ -97,13 +97,17 @@ let
         targetLlvmLibraries.libcxx
         targetLlvmLibraries.libcxxabi
         targetLlvmLibraries.compiler-rt
+      ] ++ stdenv.lib.optionals (!stdenv.targetPlatform.isWasm) [
         targetLlvmLibraries.libunwind
       ];
       extraBuildCommands = ''
         echo "-target ${stdenv.targetPlatform.config}" >> $out/nix-support/cc-cflags
         echo "-rtlib=compiler-rt -Wno-unused-command-line-argument" >> $out/nix-support/cc-cflags
         echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
+      '' + stdenv.lib.optionalString (!stdenv.targetPlatform.isWasm) ''
         echo "--unwindlib=libunwind" >> $out/nix-support/cc-cflags
+      '' + stdenv.lib.optionalString stdenv.targetPlatform.isWasm ''
+        echo "-fno-exceptions" >> $out/nix-support/cc-cflags
       '' + mkExtraBuildCommands cc;
     };
 

pkgs/development/compilers/llvm/8/libc++/default.nix

@@ -1,4 +1,5 @@
-{ lib, stdenv, fetch, cmake, python, libcxxabi, fixDarwinDylibNames, version }:
+{ lib, stdenv, fetch, cmake, python, libcxxabi, fixDarwinDylibNames, version
+, enableShared ? true }:
 
 stdenv.mkDerivation rec {
   name = "libc++-${version}";
@@ -22,7 +23,8 @@ stdenv.mkDerivation rec {
   '' + lib.optionalString stdenv.hostPlatform.isMusl ''
     patchShebangs utils/cat_files.py
   '';
-  nativeBuildInputs = [ cmake ] ++ stdenv.lib.optional stdenv.hostPlatform.isMusl python;
+  nativeBuildInputs = [ cmake ]
+    ++ stdenv.lib.optional (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) python;
 
   buildInputs = [ libcxxabi ] ++ lib.optional stdenv.isDarwin fixDarwinDylibNames;
 
@@ -30,8 +32,13 @@ stdenv.mkDerivation rec {
     "-DLIBCXX_LIBCXXABI_LIB_PATH=${libcxxabi}/lib"
     "-DLIBCXX_LIBCPPABI_VERSION=2"
     "-DLIBCXX_CXX_ABI=libcxxabi"
-  ] ++ stdenv.lib.optional stdenv.hostPlatform.isMusl "-DLIBCXX_HAS_MUSL_LIBC=1"
-    ++ stdenv.lib.optional (stdenv.hostPlatform.useLLVM or false) "-DLIBCXX_USE_COMPILER_RT=ON";
+  ] ++ stdenv.lib.optional (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) "-DLIBCXX_HAS_MUSL_LIBC=1"
+    ++ stdenv.lib.optional (stdenv.hostPlatform.useLLVM or false) "-DLIBCXX_USE_COMPILER_RT=ON"
+    ++ stdenv.lib.optional stdenv.hostPlatform.isWasm [
+      "-DLIBCXX_ENABLE_THREADS=OFF"
+      "-DLIBCXX_ENABLE_FILESYSTEM=OFF"
+      "-DLIBCXX_ENABLE_EXCEPTIONS=OFF"
+    ] ++ stdenv.lib.optional (!enableShared) "-DLIBCXX_ENABLE_SHARED=OFF";
 
   enableParallelBuilding = true;
 
@@ -46,6 +53,6 @@ stdenv.mkDerivation rec {
     homepage = http://libcxx.llvm.org/;
     description = "A new implementation of the C++ standard library, targeting C++11";
     license = with stdenv.lib.licenses; [ ncsa mit ];
-    platforms = stdenv.lib.platforms.unix;
+    platforms = stdenv.lib.platforms.all;
   };
 }

pkgs/development/compilers/llvm/8/libc++abi.nix

@@ -1,4 +1,5 @@
-{ stdenv, cmake, fetch, libcxx, libunwind, llvm, version }:
+{ stdenv, cmake, fetch, libcxx, libunwind, llvm, version
+, enableShared ? true }:
 
 stdenv.mkDerivation {
   name = "libc++abi-${version}";
@@ -6,13 +7,20 @@ stdenv.mkDerivation {
   src = fetch "libcxxabi" "1k875f977ybdkpdnr9105wa6hccy9qvpd9xd42n75h7p56bdxmn2";
 
   nativeBuildInputs = [ cmake ];
-  buildInputs = stdenv.lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD) libunwind;
+  buildInputs = stdenv.lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD && !stdenv.hostPlatform.isWasm) libunwind;
 
   cmakeFlags = stdenv.lib.optionals (stdenv.hostPlatform.useLLVM or false) [
     "-DLLVM_ENABLE_LIBCXX=ON"
     "-DLIBCXXABI_USE_LLVM_UNWINDER=ON"
+  ] ++ stdenv.lib.optionals stdenv.hostPlatform.isWasm [
+    "-DLIBCXXABI_ENABLE_THREADS=OFF"
+    "-DLIBCXXABI_ENABLE_EXCEPTIONS=OFF"
+  ] ++ stdenv.lib.optionals (!enableShared) [
+    "-DLIBCXXABI_ENABLE_SHARED=OFF"
   ];
 
+  patches = [ ./libcxxabi-no-threads.patch ];
+
   postUnpack = ''
     unpackFile ${libcxx.src}
     unpackFile ${llvm.src}
@@ -21,6 +29,8 @@ stdenv.mkDerivation {
     export TRIPLE=x86_64-apple-darwin
   '' + stdenv.lib.optionalString stdenv.hostPlatform.isMusl ''
     patch -p1 -d $(ls -d libcxx-*) -i ${../libcxx-0001-musl-hacks.patch}
+  '' + stdenv.lib.optionalString stdenv.hostPlatform.isWasm ''
+    patch -p1 -d $(ls -d llvm-*) -i ${./libcxxabi-wasm.patch}
   '';
 
   installPhase = if stdenv.isDarwin
@@ -39,8 +49,9 @@ stdenv.mkDerivation {
     else ''
       install -d -m 755 $out/include $out/lib
       install -m 644 lib/libc++abi.a $out/lib
-      install -m 644 lib/libc++abi.so.1.0 $out/lib
       install -m 644 ../include/cxxabi.h $out/include
+    '' + stdenv.lib.optionalString enableShared ''
+      install -m 644 lib/libc++abi.so.1.0 $out/lib
       ln -s libc++abi.so.1.0 $out/lib/libc++abi.so
       ln -s libc++abi.so.1.0 $out/lib/libc++abi.so.1
     '';
@@ -50,6 +61,6 @@ stdenv.mkDerivation {
     description = "A new implementation of low level support for a standard C++ library";
     license = with stdenv.lib.licenses; [ ncsa mit ];
     maintainers = with stdenv.lib.maintainers; [ vlstill ];
-    platforms = stdenv.lib.platforms.unix;
+    platforms = stdenv.lib.platforms.all;
   };
 }

pkgs/development/compilers/llvm/8/libcxxabi-no-threads.patch

@@ -0,0 +1,12 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 4138acf..41b4763 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -362,6 +362,7 @@ if (NOT LIBCXXABI_ENABLE_THREADS)
+                         " is also set to ON.")
+   endif()
+   add_definitions(-D_LIBCXXABI_HAS_NO_THREADS)
++  add_definitions(-D_LIBCPP_HAS_NO_THREADS)
+ endif()
+ 
+ if (LIBCXXABI_HAS_EXTERNAL_THREAD_API)

pkgs/development/compilers/llvm/8/libcxxabi-wasm.patch

@@ -0,0 +1,16 @@
+diff --git a/cmake/modules/HandleLLVMOptions.cmake b/cmake/modules/HandleLLVMOptions.cmake
+index 15497d405e0..33f7f18193a 100644
+--- a/cmake/modules/HandleLLVMOptions.cmake
++++ b/cmake/modules/HandleLLVMOptions.cmake
+@@ -127,7 +127,10 @@ else(WIN32)
+       set(LLVM_HAVE_LINK_VERSION_SCRIPT 1)
+     endif()
+   else(FUCHSIA OR UNIX)
+-    MESSAGE(SEND_ERROR "Unable to determine platform")
++    if(${CMAKE_SYSTEM_NAME} MATCHES "Wasi")
++    else()
++      MESSAGE(SEND_ERROR "Unable to determine platform")
++    endif()
+   endif(FUCHSIA OR UNIX)
+ endif(WIN32)
+ 

pkgs/development/interpreters/wasmtime/default.nix

@@ -0,0 +1,31 @@
+{ rustPlatform, fetchFromGitHub, lib, python, cmake, llvmPackages, clang }:
+
+rustPlatform.buildRustPackage rec {
+  name = "wasmtime-${version}";
+  version = "0.1.0";
+
+  src = fetchFromGitHub {
+    owner = "CraneStation";
+    repo = "wasmtime";
+    rev = "07a6ca8f4e1136ecd9f4af8d1f03a01aade60407";
+    sha256 = "1cq6nz90kaf023mcyblca90bpvbzhq8xjq01laa28v7r50lagcn5";
+    fetchSubmodules = true;
+  };
+
+  cargoSha256 = "17k8n5xar4pvvi4prhm6c51vlim9xqwkkhysbnss299mm3fyh36h";
+
+  cargoPatches = [ ./cargo-lock.patch ];
+
+  nativeBuildInputs = [ python cmake clang ];
+  buildInputs = [ llvmPackages.libclang ];
+
+  LIBCLANG_PATH = "${llvmPackages.libclang}/lib";
+
+  meta = with lib; {
+    description = "Standalone JIT-style runtime for WebAsssembly, using Cranelift";
+    homepage = https://github.com/CraneStation/wasmtime;
+    license = licenses.asl20;
+    maintainers = [ maintainers.matthewbauer ];
+    platforms = platforms.unix;
+  };
+}

pkgs/development/libraries/gmp/6.x.nix

@@ -1,4 +1,5 @@
-{ stdenv, fetchurl, m4, cxx ? !stdenv.hostPlatform.useAndroidPrebuilt
+{ stdenv, fetchurl, m4
+, cxx ? !stdenv.hostPlatform.useAndroidPrebuilt && !stdenv.hostPlatform.isWasm
 , buildPackages
 , withStatic ? false }:
 

pkgs/development/libraries/gnu-config/default.nix

@@ -1,21 +1,21 @@
 { stdenv, fetchurl }:
 
 let
-  rev = "b75cdc942a6172f63b34faf642b8c797239f6776";
+  rev = "a8d79c3130da83c7cacd6fee31b9acc53799c406";
 
   # Don't use fetchgit as this is needed during Aarch64 bootstrapping
   configGuess = fetchurl {
     url = "https://git.savannah.gnu.org/cgit/config.git/plain/config.guess?id=${rev}";
-    sha256 = "1bb8z1wzjs81p9qrvji4bc2a8zyxjinz90k8xq7sxxdp6zrmq1sv";
+    sha256 = "0qbq49gr2cmf4gzrjvrmpwxxgzl3vap1xm902xa8pkcqdvriq0qw";
   };
   configSub = fetchurl {
     url = "https://git.savannah.gnu.org/cgit/config.git/plain/config.sub?id=${rev}";
-    sha256 = "00dn5i2cp4iqap5vr368r5ifrgcjfq5pr97i4dkkdbha1han5hsc";
+    sha256 = "0i699axqfkxk9mgv1hlms5r44pf0s642yz75ajjjpwzhw4d5pnv4";
   };
 in
 stdenv.mkDerivation rec {
   name = "gnu-config-${version}";
-  version = "2016-12-31";
+  version = "2019-04-15";
 
   buildCommand = ''
     mkdir -p $out

pkgs/development/libraries/wasilibc/default.nix

@@ -0,0 +1,29 @@
+{ stdenv, fetchFromGitHub, lib }:
+
+stdenv.mkDerivation {
+  name = "wasilibc-20190413";
+  src = fetchFromGitHub {
+    owner = "CraneStation";
+    repo = "wasi-sysroot";
+    rev = "079d7bda78bc0ad8f69c1594444b54786545ce57";
+    sha256 = "09s906bc9485wzkgibnpfh0mii7jkldzr1a6g8k7ch0si8rshi5r";
+  };
+  makeFlags = [
+    "WASM_CC=${stdenv.cc.targetPrefix}cc"
+    "WASM_NM=${stdenv.cc.targetPrefix}nm"
+    "WASM_AR=${stdenv.cc.targetPrefix}ar"
+    "INSTALL_DIR=${placeholder "out"}"
+  ];
+
+  postInstall = ''
+    mv $out/lib/*/* $out/lib
+    ln -s $out/share/wasm32-wasi/undefined-symbols.txt $out/lib/wasi.imports
+  '';
+
+  meta = {
+    description = "WASI libc implementation for WebAssembly";
+    homepage    = "https://wasi.dev";
+    platforms   = lib.platforms.wasi;
+    maintainers = [ lib.maintainers.matthewbauer ];
+  };
+}

pkgs/stdenv/cross/default.nix

@@ -37,7 +37,8 @@ in lib.init bootStages ++ [
   # Run Packages
   (buildPackages: {
     inherit config;
-    overlays = overlays ++ crossOverlays;
+    overlays = overlays ++ crossOverlays
+      ++ (if crossSystem.isWasm then [(import ../../top-level/static.nix)] else []);
     selfBuild = false;
     stdenv = buildPackages.stdenv.override (old: rec {
       buildPlatform = localSystem;
@@ -63,7 +64,7 @@ in lib.init bootStages ++ [
              (hostPlatform.isLinux && !buildPlatform.isLinux)
              [ buildPackages.patchelf ]
         ++ lib.optional
-             (let f = p: !p.isx86 || p.libc == "musl"; in f hostPlatform && !(f buildPlatform))
+             (let f = p: !p.isx86 || p.libc == "musl" || p.libc == "wasilibc"; in f hostPlatform && !(f buildPlatform))
              buildPackages.updateAutotoolsGnuConfigScriptsHook
            # without proper `file` command, libtool sometimes fails
            # to recognize 64-bit DLLs

pkgs/stdenv/generic/default.nix

@@ -88,7 +88,7 @@ let
       # there (yet?) so it goes here until then.
       preHook = preHook+ lib.optionalString buildPlatform.isDarwin ''
         export NIX_BUILD_DONT_SET_RPATH=1
-      '' + lib.optionalString hostPlatform.isDarwin ''
+      '' + lib.optionalString (hostPlatform.isDarwin || (hostPlatform.parsed.kernel.execFormat != lib.systems.parse.execFormats.elf && hostPlatform.parsed.kernel.execFormat != lib.systems.parse.execFormats.macho)) ''
         export NIX_DONT_SET_RPATH=1
         export NIX_NO_SELF_RPATH=1
       ''

pkgs/test/cross/default.nix

@@ -93,8 +93,7 @@ let
 
   };
 
-in (lib.mapAttrs (_: mapMultiPlatformTest builtins.id) tests)
-// (lib.mapAttrs' (name: test: {
-    name = "${name}-llvm";
-    value = mapMultiPlatformTest (system: system // {useLLVM = true;}) test;
-  }) tests)
+in {
+  gcc = (lib.mapAttrs (_: mapMultiPlatformTest (system: system // {useLLVM = false;})) tests);
+  llvm = (lib.mapAttrs (_: mapMultiPlatformTest (system: system // {useLLVM = true;})) tests);
+}

pkgs/top-level/all-packages.nix

@@ -10311,10 +10311,15 @@ in
     else if stdenv.targetPlatform.useiOSPrebuilt then targetPackages.darwin.iosSdkPkgs.libraries or darwin.iosSdkPkgs.libraries
     else if name == "libSystem" then targetPackages.darwin.xcode
     else if name == "nblibc" then targetPackages.netbsdCross.libc
-    else throw "Unknown libc";
+    else if name == "wasilibc" then targetPackages.wasilibc or wasilibc
+    else throw "Unknown libc ${name}";
 
   libcCross = assert stdenv.targetPlatform != stdenv.buildPlatform; libcCrossChooser stdenv.targetPlatform.libc;
 
+  wasilibc = callPackages ../development/libraries/wasilibc {
+    stdenv = crossLibcStdenv;
+  };
+
   # Only supported on Linux, using glibc
   glibcLocales = if stdenv.hostPlatform.libc == "glibc" then callPackage ../development/libraries/glibc/locales.nix { } else null;
 
@@ -11397,7 +11402,7 @@ in
   # We also provide `libiconvReal`, which will always be a standalone libiconv,
   # just in case you want it regardless of platform.
   libiconv =
-    if (stdenv.hostPlatform.libc == "glibc" || stdenv.hostPlatform.libc == "musl")
+    if lib.elem stdenv.hostPlatform.libc ["glibc" "musl" "wasilibc"]
       then glibcIconv (if stdenv.hostPlatform != stdenv.buildPlatform
                        then libcCross
                        else stdenv.cc.libc)
@@ -23807,4 +23812,6 @@ in
     stdenv = crossLibcStdenv;
   };
 
+  wasmtime = callPackage ../development/interpreters/wasmtime {};
+
 }

pkgs/top-level/release-cross.nix

@@ -54,6 +54,13 @@ let
     windows.mingw_w64_pthreads = nativePlatforms;
   };
 
+  wasiCommon = {
+    gmp = nativePlatforms;
+    boehmgc = nativePlatforms;
+    hello = nativePlatforms;
+    zlib = nativePlatforms;
+  };
+
   darwinCommon = {
     buildPackages.binutils = darwin;
   };
@@ -140,6 +147,8 @@ in
   android64 = mapTestOnCross lib.systems.examples.aarch64-android-prebuilt (linuxCommon // {
   });
 
+  wasi32 = mapTestOnCross lib.systems.examples.wasi32 wasiCommon;
+
   msp430 = mapTestOnCross lib.systems.examples.msp430 embedded;
   avr = mapTestOnCross lib.systems.examples.avr embedded;
   arm-embedded = mapTestOnCross lib.systems.examples.arm-embedded embedded;

pkgs/top-level/static.nix

@@ -148,4 +148,16 @@ in {
     };
   };
 
+  llvmPackages_8 = super.llvmPackages_8 // {
+    libraries = super.llvmPackages_8.libraries // rec {
+      libcxxabi = super.llvmPackages_8.libraries.libcxxabi.override {
+        enableShared = false;
+      };
+      libcxx = super.llvmPackages_8.libraries.libcxx.override {
+        enableShared = false;
+        inherit libcxxabi;
+      };
+    };
+  };
+
 }