171 lines
5 KiB
Nix
171 lines
5 KiB
Nix
{ cmake
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, fetchFromGitHub
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, fetchgit
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, git
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, lib
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, libffi
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, llvmPackages_9
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, makeWrapper
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, ncurses
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, python3
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, runCommand
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, zlib
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# *NOT* from LLVM 9!
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# The compiler used to compile Cling may affect the runtime include and lib
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# directories it expects to be run with. Cling builds against (a fork of) Clang,
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# so we prefer to use Clang as the compiler as well for consistency.
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# It would be cleanest to use LLVM 9's clang, but it errors. So, we use a later
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# version of Clang to compile, but we check out the Cling fork of Clang 9 to
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# build Cling against.
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, clangStdenv
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# For runtime C++ standard library
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, gcc-unwrapped
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# Build with debug symbols
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, debug ? false
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# Build with libc++ (LLVM) rather than stdlibc++ (GCC).
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# This is experimental and not all features work.
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, useLLVMLibcxx ? false
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}:
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let
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stdenv = clangStdenv;
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# The LLVM 9 headers have a couple bugs we need to patch
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fixedLlvmDev = runCommand "llvm-dev-${llvmPackages_9.llvm.version}" { buildInputs = [git]; } ''
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mkdir $out
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cp -r ${llvmPackages_9.llvm.dev}/include $out
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cd $out
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chmod -R u+w include
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git apply ${./fix-llvm-include.patch}
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'';
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unwrapped = stdenv.mkDerivation rec {
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pname = "cling-unwrapped";
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version = "0.9";
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src = fetchgit {
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url = "http://root.cern/git/clang.git";
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rev = "cling-v0.9";
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sha256 = "sha256-ft1NUIclSiZ9lN3Z3DJCWA0U9q/K1M0TKkZr+PjsFYk=";
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};
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clingSrc = fetchFromGitHub {
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owner = "root-project";
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repo = "cling";
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rev = "v0.9";
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sha256 = "0wx3fi19wfjcph5kclf8108i436y79ddwakrcf0lgxnnxhdjyd29";
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};
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prePatch = ''
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echo "add_llvm_external_project(cling)" >> tools/CMakeLists.txt
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cp -r $clingSrc ./tools/cling
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chmod -R a+w ./tools/cling
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'';
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patches = [
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./no-clang-cpp.patch
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# https://github.com/root-project/root/commit/286d96b12aad8688b9d8e4b3b5df843dcfb716a8
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./fix-llvm-dylib-usage.patch
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./force-install-cling-targets.patch
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];
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nativeBuildInputs = [ python3 git cmake ];
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buildInputs = [ libffi ncurses zlib ];
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strictDeps = true;
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cmakeFlags = [
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"-DLLVM_BINARY_DIR=${llvmPackages_9.llvm.out}"
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"-DLLVM_CONFIG=${llvmPackages_9.llvm.dev}/bin/llvm-config"
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"-DLLVM_LIBRARY_DIR=${llvmPackages_9.llvm.lib}/lib"
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"-DLLVM_MAIN_INCLUDE_DIR=${fixedLlvmDev}/include"
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"-DLLVM_TABLEGEN_EXE=${llvmPackages_9.llvm.out}/bin/llvm-tblgen"
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"-DLLVM_TOOLS_BINARY_DIR=${llvmPackages_9.llvm.out}/bin"
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"-DLLVM_BUILD_TOOLS=Off"
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"-DLLVM_TOOL_CLING_BUILD=ON"
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"-DLLVM_TARGETS_TO_BUILD=host;NVPTX"
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"-DLLVM_ENABLE_RTTI=ON"
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# Setting -DCLING_INCLUDE_TESTS=ON causes the cling/tools targets to be built;
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# see cling/tools/CMakeLists.txt
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"-DCLING_INCLUDE_TESTS=ON"
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"-DCLANG-TOOLS=OFF"
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] ++ lib.optionals debug [
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"-DCMAKE_BUILD_TYPE=Debug"
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] ++ lib.optionals useLLVMLibcxx [
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"-DLLVM_ENABLE_LIBCXX=ON"
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"-DLLVM_ENABLE_LIBCXXABI=ON"
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];
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CPPFLAGS = if useLLVMLibcxx then [ "-stdlib=libc++" ] else [];
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postInstall = lib.optionalString (!stdenv.isDarwin) ''
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mkdir -p $out/share/Jupyter
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cp -r /build/clang/tools/cling/tools/Jupyter/kernel $out/share/Jupyter
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'';
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dontStrip = debug;
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meta = with lib; {
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description = "The Interactive C++ Interpreter";
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homepage = "https://root.cern/cling/";
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license = with licenses; [ lgpl21 ncsa ];
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maintainers = with maintainers; [ thomasjm ];
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platforms = platforms.unix;
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};
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};
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# Runtime flags for the C++ standard library
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cxxFlags = if useLLVMLibcxx then [
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"-I" "${lib.getDev llvmPackages_9.libcxx}/include/c++/v1"
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"-L" "${llvmPackages_9.libcxx}/lib"
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"-l" "${llvmPackages_9.libcxx}/lib/libc++.so"
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] else [
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"-I" "${gcc-unwrapped}/include/c++/${gcc-unwrapped.version}"
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"-I" "${gcc-unwrapped}/include/c++/${gcc-unwrapped.version}/x86_64-unknown-linux-gnu"
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];
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# The flags passed to the wrapped cling should
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# a) prevent it from searching for system include files and libs, and
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# b) provide it with the include files and libs it needs (C and C++ standard library plus
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# its own stuff)
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# These are also exposed as cling.flags because it's handy to be able to pass them to tools
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# that wrap Cling, particularly Jupyter kernels such as xeus-cling and the built-in
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# jupyter-cling-kernel, which use Cling as a library.
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# Thus, if you're packaging a Jupyter kernel, you either need to pass these flags as extra
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# args to xcpp (for xeus-cling) or put them in the environment variable CLING_OPTS
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# (for jupyter-cling-kernel).
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flags = [
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"-nostdinc"
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"-nostdinc++"
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"-isystem" "${lib.getLib unwrapped}/lib/clang/9.0.1/include"
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]
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++ cxxFlags
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++ [
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# System libc
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"-isystem" "${lib.getDev stdenv.cc.libc}/include"
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# cling includes
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"-isystem" "${lib.getDev unwrapped}/include"
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];
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in
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runCommand "cling-${unwrapped.version}" {
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nativeBuildInputs = [ makeWrapper ];
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inherit unwrapped flags;
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inherit (unwrapped) meta;
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} ''
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makeWrapper $unwrapped/bin/cling $out/bin/cling \
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--add-flags "$flags"
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''
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