162 lines
6 KiB
Nix
162 lines
6 KiB
Nix
{ lib, stdenv, makeWrapper
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, runCommand, wrapBintoolsWith, wrapCCWith, autoPatchelfHook
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, buildAndroidndk, androidndk, targetAndroidndkPkgs
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}:
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let
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# Mapping from a platform to information needed to unpack NDK stuff for that
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# platform.
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#
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# N.B. The Android NDK uses slightly different LLVM-style platform triples
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# than we do. We don't just use theirs because ours are less ambiguous and
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# some builds need that clarity.
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#
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# FIXME:
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# There's some dragons here. Build host and target concepts are being mixed up.
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ndkInfoFun = { config, ... }: {
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x86_64-apple-darwin = {
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double = "darwin-x86_64";
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};
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x86_64-unknown-linux-gnu = {
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double = "linux-x86_64";
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};
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i686-unknown-linux-android = {
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triple = "i686-linux-android";
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arch = "x86";
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};
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x86_64-unknown-linux-android = {
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triple = "x86_64-linux-android";
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arch = "x86_64";
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};
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armv7a-unknown-linux-androideabi = {
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arch = "arm";
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triple = "arm-linux-androideabi";
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};
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aarch64-unknown-linux-android = {
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arch = "arm64";
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triple = "aarch64-linux-android";
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};
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}.${config} or
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(throw "Android NDK doesn't support ${config}, as far as we know");
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buildInfo = ndkInfoFun stdenv.buildPlatform;
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hostInfo = ndkInfoFun stdenv.hostPlatform;
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targetInfo = ndkInfoFun stdenv.targetPlatform;
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inherit (stdenv.targetPlatform) sdkVer;
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suffixSalt = lib.replaceStrings ["-" "."] ["_" "_"] stdenv.targetPlatform.config;
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# targetInfo.triple is what Google thinks the toolchain should be, this is a little
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# different from what we use. We make it four parts to conform with the existing
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# standard more properly.
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targetPrefix = lib.optionalString (stdenv.targetPlatform != stdenv.hostPlatform) (stdenv.targetPlatform.config + "-");
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in
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rec {
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# Misc tools
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binaries = stdenv.mkDerivation {
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pname = "${targetPrefix}ndk-toolchain";
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inherit (androidndk) version;
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nativeBuildInputs = [ makeWrapper autoPatchelfHook ];
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propagatedBuildInputs = [ androidndk ];
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passthru = {
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inherit targetPrefix;
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isClang = true; # clang based cc, but bintools ld
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};
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dontUnpack = true;
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dontBuild = true;
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dontStrip = true;
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dontConfigure = true;
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dontPatch = true;
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autoPatchelfIgnoreMissingDeps = true;
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installPhase = ''
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# https://developer.android.com/ndk/guides/other_build_systems
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mkdir -p $out
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cp -r ${androidndk}/libexec/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/${buildInfo.double} $out/toolchain
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find $out/toolchain -type d -exec chmod 777 {} \;
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if [ ! -d $out/toolchain/sysroot/usr/lib/${targetInfo.triple}/${sdkVer} ]; then
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echo "NDK does not contain libraries for SDK version ${sdkVer}";
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exit 1
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fi
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ln -vfs $out/toolchain/sysroot/usr/lib $out/lib
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ln -s $out/toolchain/sysroot/usr/lib/${targetInfo.triple}/*.so $out/lib/
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ln -s $out/toolchain/sysroot/usr/lib/${targetInfo.triple}/*.a $out/lib/
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chmod +w $out/lib/*
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ln -s $out/toolchain/sysroot/usr/lib/${targetInfo.triple}/${sdkVer}/*.so $out/lib/
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ln -s $out/toolchain/sysroot/usr/lib/${targetInfo.triple}/${sdkVer}/*.o $out/lib/
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echo "INPUT(-lc++_static)" > $out/lib/libc++.a
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ln -s $out/toolchain/bin $out/bin
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ln -s $out/toolchain/${targetInfo.triple}/bin/* $out/bin/
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for f in $out/bin/${targetInfo.triple}-*; do
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ln -s $f ''${f/${targetInfo.triple}-/${targetPrefix}}
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done
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for f in $(find $out/toolchain -type d -name ${targetInfo.triple}); do
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ln -s $f ''${f/${targetInfo.triple}/${targetPrefix}}
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done
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rm -f $out/bin/${targetPrefix}ld
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ln -s $out/bin/lld $out/bin/${targetPrefix}ld
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(cd $out/bin;
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for tool in llvm-*; do
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ln -sf $tool ${targetPrefix}$(echo $tool | sed 's/llvm-//')
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ln -sf $tool $(echo $tool | sed 's/llvm-//')
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done)
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# handle last, as llvm-as is for llvm bytecode
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ln -sf $out/bin/${targetInfo.triple}-as $out/bin/${targetPrefix}as
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ln -sf $out/bin/${targetInfo.triple}-as $out/bin/as
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patchShebangs $out/bin
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'';
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};
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binutils = wrapBintoolsWith {
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bintools = binaries;
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libc = targetAndroidndkPkgs.libraries;
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};
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clang = wrapCCWith {
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cc = binaries // {
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# for packages expecting libcompiler-rt, etc. to come from here (stdenv.cc.cc.lib)
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lib = targetAndroidndkPkgs.libraries;
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};
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bintools = binutils;
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libc = targetAndroidndkPkgs.libraries;
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extraBuildCommands = ''
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echo "-D__ANDROID_API__=${stdenv.targetPlatform.sdkVer}" >> $out/nix-support/cc-cflags
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# Android needs executables linked with -pie since version 5.0
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# Use -fPIC for compilation, and link with -pie if no -shared flag used in ldflags
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echo "-target ${targetInfo.triple} -fPIC" >> $out/nix-support/cc-cflags
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echo "-z,noexecstack -z,relro -z,now -z,muldefs" >> $out/nix-support/cc-ldflags
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echo 'expandResponseParams "$@"' >> $out/nix-support/add-flags.sh
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echo 'if [[ ! (" ''${params[@]} " =~ " -shared ") && ! (" ''${params[@]} " =~ " -no-pie ") ]]; then NIX_LDFLAGS_${suffixSalt}+=" -pie"; fi' >> $out/nix-support/add-flags.sh
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echo "-Xclang -mnoexecstack" >> $out/nix-support/cc-cxxflags
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if [ ${targetInfo.triple} == arm-linux-androideabi ]; then
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# https://android.googlesource.com/platform/external/android-cmake/+/refs/heads/cmake-master-dev/android.toolchain.cmake
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echo "--fix-cortex-a8" >> $out/nix-support/cc-ldflags
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fi
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'';
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};
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# Bionic lib C and other libraries.
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#
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# We use androidndk from the previous stage, else we waste time or get cycles
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# cross-compiling packages to wrap incorrectly wrap binaries we don't include
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# anyways.
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libraries = runCommand "bionic-prebuilt" {} ''
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lpath=${buildAndroidndk}/libexec/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/${buildInfo.double}/sysroot/usr/lib/${targetInfo.triple}/${sdkVer}
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if [ ! -d $lpath ]; then
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echo "NDK does not contain libraries for SDK version ${sdkVer} <$lpath>"
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exit 1
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fi
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mkdir -p $out/lib
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cp $lpath/*.so $lpath/*.a $out/lib
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chmod +w $out/lib/*
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cp $lpath/* $out/lib
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'';
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}
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