nix overlays introduced and tracked

11 files changed, 788 insertions, 0 deletions

diff --git a/nix-overlays/README b/nix-overlays/README
new file mode 100644
index 0000000..c060f58
--- /dev/null
+++ b/nix-overlays/README
@@ -0,0 +1,153 @@
+-*- mode: org -*-
+#+TITLE:       D related overlays
+#+DESCRIPTION: ldc, dub, dtools: dlang compiler build tool and tools
+#+FILETAGS:    :dlang:build:tools:
+#+AUTHOR:      Ralph Amissah
+#+EMAIL:       [[mailto:ralph.amissah@gmail.com][ralph.amissah@gmail.com]]
+#+COPYRIGHT:   Copyright (C) 2015 - 2023 Ralph Amissah
+#+LANGUAGE:    en
+#+STARTUP:     content hideblocks hidestars noindent entitiespretty
+#+OPTIONS:     H:3 num:nil toc:t \n:nil @:t ::t |:t ^:nil _:nil -:t f:t *:t <:t
+#+PROPERTY:    header-args  :exports code
+#+PROPERTY:    header-args+ :noweb yes
+#+PROPERTY:    header-args+ :eval no
+#+PROPERTY:    header-args+ :results no
+#+PROPERTY:    header-args+ :cache no
+#+PROPERTY:    header-args+ :padline no
+
+* README for D related overlays
+** dlang-nix-overlays
+
+Nix build overlays for building and testing more recent versions of the dlang
+compiler and build tools: ldc, dub and dtools, than exist in nixpkgs at the time
+of publishing, in some cases with additional fixes.
+
+nix overlays for (updates nixpkgs, more recent versions of):
+  - ldc     ( 1.30.0 -> 1.30.0 )
+  - dub     ( 1.23.0 -> 1.30.0 ) [for nix versions 1.31.0 ... 1.33.0 broken]
+  - dtools  ( 2.095.1 -> 2.103.1 )
+
+  - dmd     ( 2.100.2 -> 2.104.0 ) KO ✗
+  - gdc     [not yet available]
+
+(updates nixpkgs circa 2023-05-12)
+
+dlang-nix-flakes.org --❯
+  .
+  └── nix-overlays
+      ├── dmd
+      │   ├── binary.nix
+      │   ├── bootstrap.nix
+      │   ├── default.nix
+      │   └── generic.nix
+      ├── dtools
+      │   └── default.nix
+      ├── dub
+      │   └── default.nix
+      ├── ldc
+      │   ├── binary.nix
+      │   ├── bootstrap.nix
+      │   ├── default.nix
+      │   └── generic.nix
+      └── README
+
+search nixpkgs here:
+
+- https://search.nixos.org/packages?channel=unstable&from=0&size=100&sort=relevance&query=
+
+** compilers
+*** ldc OK ✓ ( 1.30.0 -> 1.30.0 )
+
+- https://wiki.dlang.org/LDC
+
+- https://github.com/ldc-developers/ldc
+  - https://github.com/ldc-developers/ldc/releases
+    nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.30.0.tar.gz
+  - https://github.com/ldc-developers/ldc/issues
+
+- version in nixpkgs:
+  - https://search.nixos.org/packages?channel=unstable&show=ldc&from=0&size=100&sort=relevance&type=packages&query=ldc
+
+*** dmd KO ✗ ( 2.100.2 -> 2.104.0 )
+
+- https://dlang.org/
+  - https://wiki.dlang.org/LDC
+
+- https://github.com/dlang/dmd
+  - https://github.com/dlang/dmd/tags
+    nix-prefetch-url --unpack https://github.com/dlang/dmd/archive/refs/tags/v2.104.0.tar.gz
+  - https://github.com/dlang/dmd/pulls
+
+- version in nixpkgs:
+  - https://search.nixos.org/packages?channel=unstable&show=dmd&from=0&size=100&sort=relevance&type=packages&query=dmd
+
+- dmd nixpkg modified and appears to build ok, but it appears my overlay does
+  not get things right REVIEW
+
+- dmd on nixos FAILS to build (my working projects), appears not to find parts
+  of itself
+
+*** gdc ( not provided yet with gcc12 in nixpkgs )
+
+not yet provided in nixpkgs with gcc12, no attempt made
+
+- https://wiki.dlang.org/GDC
+  - https://wiki.dlang.org/GDC_Development
+
+- https://github.com/D-Programming-GDC/gdc
+
+** build tool
+*** dub ( 1.23.0 -> 1.30.0 )
+
+- https://code.dlang.org/packages/dub
+
+- https://github.com/dlang/dub
+  - https://github.com/dlang/dub/releases
+    nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.30.0.tar.gz
+  - https://github.com/dlang/dub/issues
+
+- version in nixpkgs:
+  - https://search.nixos.org/packages?channel=unstable&show=dub&from=0&size=100&sort=relevance&type=packages&query=dub
+
+- dub nixpkg overlay is updated and runs most dub tests correctly
+
+- dub from v1.31.0 FAILS to build packages with nix tools that previous version
+  of dub built (from v1.23.0 to v1.30.0 which is currently in nixpkgs); FAILURE
+  is from v1.31.0 through v1.32.1 (which is current at the time of this commit)
+
+** tools
+*** dtools OK ✓ ( 2.095.1 -> 2.103.1 )
+
+- https://code.dlang.org/packages/dtools
+
+- https://github.com/dlang/tools
+  - https://github.com/dlang/tools/tags
+    nix-prefetch --unpack https://github.com/dlang/tools/archive/refs/tags/v2.103.1.tar.gz
+  - https://github.com/dlang/tools/issues
+
+- version in nixpkgs
+  - https://search.nixos.org/packages?channel=unstable&show=dtools&from=0&size=100&sort=relevance&type=packages&query=dtools
+
+** nixpkgs
+
+It is possible to work directly against a local copy of nixpkgs. To do so you
+would clone nixpkgs and point to the local nixpkgs as your build source.
+
+git clone --depth=1 --branch master https://github.com/nixos/nixpkgs nixpkgs
+
+- ./nixpkgs/pkgs/development/compilers/ldc
+- ./nixpkgs/pkgs/development/compilers/dmd
+- ./nixpkgs/pkgs/development/tools/build-managers/dub
+- ./nixpkgs/pkgs/development/tools/dtools
+
+- ./nixpkgs/pkgs/development/compilers/gcc
+
+Note the overlays if copied to the nixpkgs path locations should work as they do
+in the overlay, with a pointer to the cloned nixpkgs as nixpkgs repository
+source. In fact the starting point for the overlays was to take verbatim what
+was in nixpkgs and then to update and fix where necessary those packages.
+
+It is possible to compare the changes made by the overlays here directly against
+what is currently available in nixpkgs.
+
+- https://search.nixos.org/packages?channel=unstable&size=100&sort=relevance&query=
diff --git a/nix-overlays/dmd/binary.nix b/nix-overlays/dmd/binary.nix
new file mode 100644
index 0000000..6a99d42
--- /dev/null
+++ b/nix-overlays/dmd/binary.nix
@@ -0,0 +1,72 @@
+{ lib, stdenv, fetchurl, curl, tzdata, autoPatchelfHook, fixDarwinDylibNames, glibc
+, version, hashes }:
+
+let
+  inherit (stdenv) hostPlatform;
+  OS = if hostPlatform.isDarwin then "osx" else hostPlatform.parsed.kernel.name;
+  MODEL = toString hostPlatform.parsed.cpu.bits;
+in stdenv.mkDerivation {
+  pname = "dmd-bootstrap";
+  inherit version;
+
+  src = fetchurl rec {
+    name = "dmd.${version}.${OS}.tar.xz";
+    url = "http://downloads.dlang.org/releases/2.x/${version}/${name}";
+    sha256 = hashes.${OS} or (throw "missing bootstrap sha256 for OS ${OS}");
+  };
+
+  dontConfigure = true;
+  dontBuild = true;
+
+  nativeBuildInputs = lib.optionals hostPlatform.isLinux [
+    autoPatchelfHook
+  ] ++ lib.optionals hostPlatform.isDarwin [
+    fixDarwinDylibNames
+  ];
+  propagatedBuildInputs = [
+    curl
+    tzdata
+  ] ++ lib.optionals hostPlatform.isLinux [
+    glibc
+    stdenv.cc.cc.libgcc
+  ];
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out
+
+    # try to copy model-specific binaries into bin first
+    mv ${OS}/bin${MODEL} $out/bin || true
+
+    mv src license.txt ${OS}/* $out/
+
+    # move man into place
+    mkdir -p $out/share
+    mv man $out/share/
+
+    # move docs into place
+    mkdir -p $out/share/doc
+    mv html/d $out/share/doc/
+
+    # fix paths in dmd.conf (one level less)
+    substituteInPlace $out/bin/dmd.conf --replace "/../../" "/../"
+
+    runHook postInstall
+  '';
+
+  # Stripping on Darwin started to break libphobos2.a
+  # Undefined symbols for architecture x86_64:
+  #   "_rt_envvars_enabled", referenced from:
+  #       __D2rt6config16rt_envvarsOptionFNbNiAyaMDFNbNiQkZQnZQq in libphobos2.a(config_99a_6c3.o)
+  dontStrip = hostPlatform.isDarwin;
+
+  meta = with lib; {
+    description = "Digital Mars D Compiler Package";
+    # As of 2.075 all sources and binaries use the boost license
+    license = licenses.boost;
+    maintainers = [ maintainers.lionello ];
+    homepage = "https://dlang.org/";
+    platforms = [ "x86_64-darwin" "i686-linux" "x86_64-linux" ];
+  };
+}
diff --git a/nix-overlays/dmd/bootstrap.nix b/nix-overlays/dmd/bootstrap.nix
new file mode 100644
index 0000000..16aa5ed
--- /dev/null
+++ b/nix-overlays/dmd/bootstrap.nix
@@ -0,0 +1,9 @@
+{ callPackage }:
+callPackage ./binary.nix {
+  version = "2.090.1";
+  hashes = {
+    # Get these from `nix-prefetch-url http://downloads.dlang.org/releases/2.x/2.090.1/dmd.2.090.1.linux.tar.xz` etc..
+    osx = "sha256-9HwGVO/8jfZ6aTiDIUi8w4C4Ukry0uUS8ACP3Ig8dmU=";
+    linux = "sha256-ByCrIA4Nt7i9YT0L19VXIL1IqIp+iObcZux407amZu4=";
+  };
+}
diff --git a/nix-overlays/dmd/default.nix b/nix-overlays/dmd/default.nix
new file mode 100644
index 0000000..7beb9e5
--- /dev/null
+++ b/nix-overlays/dmd/default.nix
@@ -0,0 +1,6 @@
+import ./generic.nix {
+  version = "2.104.0";
+  dmdSha256 = "sha256-yv+uW6cYAId2HK/YSPxsR9Xt0o3LWa97z8KyzjFik6s=";
+  #druntimeSha256 = "";
+  phobosSha256 = "sha256-cWp36Gd/lh3gy21bf9z0/RqzlJmf6ypmx72aMeakcec=";
+}
diff --git a/nix-overlays/dmd/generic.nix b/nix-overlays/dmd/generic.nix
new file mode 100644
index 0000000..e500385
--- /dev/null
+++ b/nix-overlays/dmd/generic.nix
@@ -0,0 +1,219 @@
+{ version
+, dmdSha256
+, phobosSha256
+}:
+
+{ stdenv
+, lib
+, fetchFromGitHub
+, makeWrapper
+, which
+, writeTextFile
+, curl
+, tzdata
+, gdb
+, callPackage
+, targetPackages
+, fetchpatch
+, bash
+, installShellFiles
+, git
+, unzip
+, HOST_DMD ? "${callPackage ./bootstrap.nix { }}/bin/dmd"
+}:
+
+let
+  dmdConfFile = writeTextFile {
+    name = "dmd.conf";
+    text = (lib.generators.toINI { } {
+      Environment = {
+        DFLAGS = ''-I@out@/include/dmd -L-L@out@/lib -fPIC ${lib.optionalString (!targetPackages.stdenv.cc.isClang) "-L--export-dynamic"}'';
+      };
+    });
+  };
+
+  bits = builtins.toString stdenv.hostPlatform.parsed.cpu.bits;
+  osname =
+    if stdenv.isDarwin then
+      "osx"
+    else
+      stdenv.hostPlatform.parsed.kernel.name;
+
+  pathToDmd = "\${NIX_BUILD_TOP}/dmd/generated/${osname}/release/${bits}/dmd";
+in
+
+stdenv.mkDerivation rec {
+  pname = "dmd";
+  inherit version;
+
+  enableParallelBuilding = true;
+
+  srcs = [
+    (fetchFromGitHub {
+      owner = "dlang";
+      repo = "dmd";
+      rev = "v${version}";
+      sha256 = dmdSha256;
+      name = "dmd";
+    })
+    (fetchFromGitHub {
+      owner = "dlang";
+      repo = "phobos";
+      rev = "v${version}";
+      sha256 = phobosSha256;
+      name = "phobos";
+    })
+  ];
+
+  sourceRoot = ".";
+
+  # https://issues.dlang.org/show_bug.cgi?id=19553
+  hardeningDisable = [ "fortify" ];
+
+  #patches = lib.optionals (lib.versionOlder version "2.088.0") [
+  #  # Migrates D1-style operator overloads in DMD source, to allow building with
+  #  # a newer DMD
+  #  (fetchpatch {
+  #    url = "https://github.com/dlang/dmd/commit/c4d33e5eb46c123761ac501e8c52f33850483a8a.patch";
+  #    stripLen = 1;
+  #    extraPrefix = "dmd/";
+  #    sha256 = "sha256-N21mAPfaTo+zGCip4njejasraV5IsWVqlGR5eOdFZZE=";
+  #  })
+  #] ++ lib.optionals (lib.versionOlder version "2.092.2") [
+  #  # Fixes C++ tests that compiled on older C++ but not on the current one
+  #  (fetchpatch {
+  #    url = "https://github.com/dlang/druntime/commit/438990def7e377ca1f87b6d28246673bb38022ab.patch";
+  #    stripLen = 1;
+  #    extraPrefix = "druntime/";
+  #    sha256 = "sha256-/pPKK7ZK9E/mBrxm2MZyBNhYExE8p9jz8JqBdZSE6uY=";
+  #  })
+  #];
+
+  postPatch = ''
+    patchShebangs dmd/compiler/test/{runnable,fail_compilation,compilable,tools}{,/extra-files}/*.sh
+
+    rm dmd/compiler/test/runnable_cxx/cppa.d
+
+    # Grep'd string changed with gdb 12
+    #   https://issues.dlang.org/show_bug.cgi?id=23198
+    substituteInPlace dmd/druntime/test/exceptions/Makefile \
+      --replace 'in D main (' 'in _Dmain ('
+
+    # We're using gnused on all platforms
+    substituteInPlace dmd/druntime/test/coverage/Makefile \
+      --replace 'freebsd osx' 'none'
+  ''
+
+  + lib.optionalString (lib.versionOlder version "2.091.0") ''
+    # This one has tested against a hardcoded year, then against a current year on
+    # and off again. It just isn't worth it to patch all the historical versions
+    # of it, so just remove it until the most recent change.
+    rm dmd/compiler/test/compilable/ddocYear.d
+  '' + lib.optionalString (lib.versionAtLeast version "2.089.0" && lib.versionOlder version "2.092.2") ''
+    rm dmd/compiler/test/dshell/test6952.d
+  '' + lib.optionalString (lib.versionAtLeast version "2.092.2") ''
+    substituteInPlace dmd/compiler/test/dshell/test6952.d --replace "/usr/bin/env bash" "${bash}/bin/bash"
+  ''
+
+  + lib.optionalString stdenv.isLinux ''
+    substituteInPlace phobos/std/socket.d --replace "assert(ih.addrList[0] == 0x7F_00_00_01);" ""
+  '' + lib.optionalString stdenv.isDarwin ''
+    substituteInPlace phobos/std/socket.d --replace "foreach (name; names)" "names = []; foreach (name; names)"
+  '';
+
+  nativeBuildInputs = [
+    makeWrapper
+    which
+    installShellFiles
+  ] ++ lib.optionals (lib.versionOlder version "2.088.0") [
+    git
+  ];
+
+  buildInputs = [
+    curl
+    tzdata
+  ];
+
+  nativeCheckInputs = [
+    gdb
+  ] ++ lib.optionals (lib.versionOlder version "2.089.0") [
+    unzip
+  ];
+
+  buildFlags = [
+    "BUILD=release"
+    "ENABLE_RELEASE=1"
+    "PIC=1"
+  ];
+
+  # Build and install are based on http://wiki.dlang.org/Building_DMD
+  buildPhase = ''
+    runHook preBuild
+
+    export buildJobs=$NIX_BUILD_CORES
+    if [ -z $enableParallelBuilding ]; then
+      buildJobs=1
+    fi
+
+    make -C dmd -f posix.mak $buildFlags -j$buildJobs HOST_DMD=${HOST_DMD}
+    echo ${tzdata}/share/zoneinfo/ > TZDatabaseDirFile
+    echo ${lib.getLib curl}/lib/libcurl${stdenv.hostPlatform.extensions.sharedLibrary} > LibcurlPathFile
+    make -C phobos -f posix.mak $buildFlags -j$buildJobs DMD=${pathToDmd} DFLAGS="-version=TZDatabaseDir -version=LibcurlPath -J$PWD"
+
+    runHook postBuild
+  '';
+
+  doCheck = true;
+
+  checkFlags = buildFlags;
+
+  # many tests are disbled because they are failing
+
+  # NOTE: Purity check is disabled for checkPhase because it doesn't fare well
+  # with the DMD linker. See https://github.com/NixOS/nixpkgs/issues/97420
+  checkPhase = ''
+    runHook preCheck
+
+    export checkJobs=$NIX_BUILD_CORES
+    if [ -z $enableParallelChecking ]; then
+      checkJobs=1
+    fi
+
+    NIX_ENFORCE_PURITY= \
+      make -C dmd/compiler/test $checkFlags CC=$CXX SHELL=$SHELL -j$checkJobs N=$checkJobs
+
+    NIX_ENFORCE_PURITY= \
+      make -C phobos -f posix.mak unittest $checkFlags -j$checkJobs DFLAGS="-version=TZDatabaseDir -version=LibcurlPath -J$PWD"
+
+    runHook postCheck
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    install -Dm755 ${pathToDmd} $out/bin/dmd
+
+    installManPage dmd/docs/man/man*/*
+
+    mkdir $out/lib
+    cp phobos/generated/${osname}/release/${bits}/libphobos2.* $out/lib/
+
+    wrapProgram $out/bin/dmd \
+      --prefix PATH ":" "${targetPackages.stdenv.cc}/bin" \
+      --set-default CC "${targetPackages.stdenv.cc}/bin/cc"
+
+    substitute ${dmdConfFile} "$out/bin/dmd.conf" --subst-var out
+
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "Official reference compiler for the D language";
+    homepage = "https://dlang.org/";
+    # Everything is now Boost licensed, even the backend.
+    # https://github.com/dlang/dmd/pull/6680
+    license = licenses.boost;
+    maintainers = with maintainers; [ ThomasMader lionello dukc ];
+    platforms = [ "x86_64-linux" "i686-linux" "x86_64-darwin" ];
+  };
+}
diff --git a/nix-overlays/dtools/default.nix b/nix-overlays/dtools/default.nix
new file mode 100644
index 0000000..d605e4d
--- /dev/null
+++ b/nix-overlays/dtools/default.nix
@@ -0,0 +1,51 @@
+{ stdenv, lib, fetchFromGitHub, fetchpatch, ldc, curl, gnumake42 }:
+
+stdenv.mkDerivation rec {
+  pname = "dtools";
+  version = "2.103.1";
+
+  src = fetchFromGitHub {
+    owner = "dlang";
+    repo = "tools";
+    rev = "v${version}";
+    sha256 = "sha256-XM4gUxcarQCOBR8W/o0iWAI54PyLDkH6CsDce22Cnu4=";
+    name = "dtools";
+  };
+
+  patches = [
+    (fetchpatch {
+      # part of https://github.com/dlang/tools/pull/441
+      url = "https://github.com/dlang/tools/commit/6c6a042d1b08e3ec1790bd07a7f69424625ee866.patch"; # Fix LDC arm64 build
+      sha256 = "sha256-x6EclTYN1Y5FG57KLhbBK0BZicSYcZoWO7MTVcP4T18=";
+    })
+  ];
+
+  nativeBuildInputs = [ ldc gnumake42 ]; # fails with make 4.4
+  buildInputs = [ curl ];
+
+  makeCmd = ''
+    make -f posix.mak all DMD_DIR=dmd DMD=${ldc.out}/bin/ldmd2 CC=${stdenv.cc}/bin/cc
+  '';
+
+  buildPhase = ''
+    $makeCmd
+  '';
+
+  doCheck = true;
+
+  checkPhase = ''
+      $makeCmd test_rdmd
+    '';
+
+  installPhase = ''
+      $makeCmd INSTALL_DIR=$out install
+  '';
+
+  meta = with lib; {
+    description = "Ancillary tools for the D programming language compiler";
+    homepage = "https://github.com/dlang/tools";
+    license = lib.licenses.boost;
+    maintainers = with maintainers; [ ThomasMader ];
+    platforms = lib.platforms.unix;
+  };
+}
diff --git a/nix-overlays/dub/default.nix b/nix-overlays/dub/default.nix
new file mode 100644
index 0000000..0ebc576
--- /dev/null
+++ b/nix-overlays/dub/default.nix
@@ -0,0 +1,83 @@
+{ lib, stdenv, fetchFromGitHub, curl, libevent, rsync, ldc, dcompiler ? ldc }:
+
+assert dcompiler != null;
+
+stdenv.mkDerivation rec {
+  pname = "dub";
+  version = "1.30.0";
+
+  enableParallelBuilding = true;
+
+  src = fetchFromGitHub {
+    owner = "dlang";
+    repo = "dub";
+    rev = "v${version}";
+    sha256 = "sha256-iVl7bjblvIxvrUX7Phq6h4AIAmZjNVkGYYFA1hhsE7c=";
+  };
+
+  #postUnpack = ''
+  #  patchShebangs .
+  #'';
+
+  dubvar = "\\$DUB";
+  postPatch = ''
+    patchShebangs test
+
+    # Can be removed with https://github.com/dlang/dub/pull/1368
+    substituteInPlace test/fetchzip.sh \
+        --replace "dub remove" "\"${dubvar}\" remove"
+  '';
+
+  nativeBuildInputs = [ dcompiler libevent rsync ];
+  buildInputs = [ curl ];
+
+  buildPhase = ''
+    for DC_ in dmd ldmd2 gdmd; do
+      echo "... check for D compiler $DC_ ..."
+      export DC=$(type -P $DC_ || echo "")
+      if [ ! "$DC" == "" ]; then
+        break
+      fi
+    done
+    if [ "$DC" == "" ]; then
+      exit "Error: could not find D compiler"
+    fi
+    echo "$DC_ found and used as D compiler in buildPhase for $pname"
+    $DC ./build.d
+    ./build
+  '';
+
+  doCheck = !stdenv.isDarwin;
+
+  checkPhase = ''
+    export DUB=$NIX_BUILD_TOP/source/bin/dub
+    export PATH=$PATH:$NIX_BUILD_TOP/source/bin/
+    #export DC=${dcompiler.out}/bin/${if dcompiler.pname=="ldc" then "ldc2" else dcompiler.pname}
+    if [ "$DC" == "" ]; then
+      exit "Error: could not find D compiler"
+    fi
+    echo "DC out --> $DC"
+    export HOME=$TMP
+
+    rm -rf test/issue502-root-import
+    rm -rf test/dpath-variable
+    rm test/dpath-variable.sh
+    rm -rf test/git-dependency
+    rm -rf test/use-c-sources # added to build v1.33.0
+
+    ./test/run-unittest.sh
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp bin/dub $out/bin
+  '';
+
+  meta = with lib; {
+    description = "Package and build manager for D applications and libraries";
+    homepage = "https://code.dlang.org/";
+    license = licenses.mit;
+    maintainers = with maintainers; [ ThomasMader ];
+    platforms = [ "x86_64-linux" "i686-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+  };
+}
diff --git a/nix-overlays/ldc/binary.nix b/nix-overlays/ldc/binary.nix
new file mode 100644
index 0000000..dd4d51c
--- /dev/null
+++ b/nix-overlays/ldc/binary.nix
@@ -0,0 +1,43 @@
+{ lib, stdenv, fetchurl, curl, tzdata, autoPatchelfHook, fixDarwinDylibNames, libxml2
+, version, hashes }:
+
+let
+  inherit (stdenv) hostPlatform;
+  OS = if hostPlatform.isDarwin then "osx" else hostPlatform.parsed.kernel.name;
+  ARCH = if hostPlatform.isDarwin && hostPlatform.isAarch64 then "arm64" else hostPlatform.parsed.cpu.name;
+in stdenv.mkDerivation {
+  pname = "ldc-bootstrap";
+  inherit version;
+
+  src = fetchurl rec {
+    name = "ldc2-${version}-${OS}-${ARCH}.tar.xz";
+    url = "https://github.com/ldc-developers/ldc/releases/download/v${version}/${name}";
+    sha256 = hashes."${OS}-${ARCH}" or (throw "missing bootstrap sha256 for ${OS}-${ARCH}");
+  };
+
+  dontConfigure = true;
+  dontBuild = true;
+
+  nativeBuildInputs = lib.optionals hostPlatform.isLinux [
+    autoPatchelfHook
+  ] ++ lib.optional hostPlatform.isDarwin fixDarwinDylibNames;
+
+  buildInputs = lib.optionals stdenv.hostPlatform.isLinux [ libxml2 stdenv.cc.cc ];
+
+  propagatedBuildInputs = [ curl tzdata ];
+
+  installPhase = ''
+    mkdir -p $out
+
+    mv bin etc import lib LICENSE README $out/
+  '';
+
+  meta = with lib; {
+    description = "The LLVM-based D Compiler";
+    homepage = "https://github.com/ldc-developers/ldc";
+    # from https://github.com/ldc-developers/ldc/blob/master/LICENSE
+    license = with licenses; [ bsd3 boost mit ncsa gpl2Plus ];
+    maintainers = with maintainers; [ ThomasMader lionello ];
+    platforms = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
+  };
+}
diff --git a/nix-overlays/ldc/bootstrap.nix b/nix-overlays/ldc/bootstrap.nix
new file mode 100644
index 0000000..7724cbc
--- /dev/null
+++ b/nix-overlays/ldc/bootstrap.nix
@@ -0,0 +1,11 @@
+{ callPackage }:
+callPackage ./binary.nix {
+  version = "1.25.0";
+  hashes = {
+    # Get these from `nix-prefetch-url https://github.com/ldc-developers/ldc/releases/download/v1.19.0/ldc2-1.19.0-osx-x86_64.tar.xz` etc..
+    osx-x86_64 = "sha256-6iKnbS+oalLKmyS8qYD/wS21b7+O+VgsWG2iT4PrWPU=";
+    linux-x86_64 = "sha256-sfg47RdlsIpryc3iZvE17OtLweh3Zw6DeuNJYgpuH+o=";
+    linux-aarch64  = "sha256-UDZ43x4flSo+SfsPeE8juZO2Wtk2ZzwySk0ADHnvJBI=";
+    osx-arm64  = "sha256-O/x0vy0wwQFaDc4uWSeMhx+chJKqbQb6e5QNYf+7DCw=";
+  };
+}
diff --git a/nix-overlays/ldc/default.nix b/nix-overlays/ldc/default.nix
new file mode 100644
index 0000000..5badb07
--- /dev/null
+++ b/nix-overlays/ldc/default.nix
@@ -0,0 +1,4 @@
+import ./generic.nix {
+  version = "1.30.0";
+  sha256 = "sha256-/bs3bwgkLZF5IqaiKnc5gCF/r6MQBG/F1kWUkK8j2s0=";
+}
diff --git a/nix-overlays/ldc/generic.nix b/nix-overlays/ldc/generic.nix
new file mode 100644
index 0000000..979d78c
--- /dev/null
+++ b/nix-overlays/ldc/generic.nix
@@ -0,0 +1,137 @@
+{ version, sha256 }:
+{ lib, stdenv, fetchurl, cmake, ninja, llvm_15, curl, tzdata
+, libconfig, lit, gdb, unzip, darwin, bash
+, callPackage, makeWrapper, runCommand, targetPackages
+, ldcBootstrap ? callPackage ./bootstrap.nix { }
+}:
+
+let
+  pathConfig = runCommand "ldc-lib-paths" {} ''
+    mkdir $out
+    echo ${tzdata}/share/zoneinfo/ > $out/TZDatabaseDirFile
+    echo ${curl.out}/lib/libcurl${stdenv.hostPlatform.extensions.sharedLibrary} > $out/LibcurlPathFile
+  '';
+
+in
+
+stdenv.mkDerivation rec {
+  pname = "ldc";
+  inherit version;
+
+  src = fetchurl {
+    url = "https://github.com/ldc-developers/ldc/releases/download/v${version}/ldc-${version}-src.tar.gz";
+    inherit sha256;
+  };
+
+  # https://issues.dlang.org/show_bug.cgi?id=19553
+  hardeningDisable = [ "fortify" ];
+
+  postUnpack = ''
+    patchShebangs .
+  ''
+  + ''
+      rm ldc-${version}-src/tests/dmd/fail_compilation/mixin_gc.d
+      rm ldc-${version}-src/tests/dmd/runnable/xtest46_gc.d
+      rm ldc-${version}-src/tests/dmd/runnable/testptrref_gc.d
+
+      # test depends on current year
+      rm ldc-${version}-src/tests/dmd/compilable/ddocYear.d
+  ''
+  + lib.optionalString stdenv.hostPlatform.isDarwin ''
+      # https://github.com/NixOS/nixpkgs/issues/34817
+      rm -r ldc-${version}-src/tests/plugins/addFuncEntryCall
+  '';
+
+  postPatch = ''
+    # Setting SHELL=$SHELL when dmd testsuite is run doesn't work on Linux somehow
+    substituteInPlace tests/dmd/Makefile --replace "SHELL=/bin/bash" "SHELL=${bash}/bin/bash"
+  ''
+  + lib.optionalString stdenv.hostPlatform.isLinux ''
+      substituteInPlace runtime/phobos/std/socket.d --replace "assert(ih.addrList[0] == 0x7F_00_00_01);" ""
+  ''
+  + lib.optionalString stdenv.hostPlatform.isDarwin ''
+      substituteInPlace runtime/phobos/std/socket.d --replace "foreach (name; names)" "names = []; foreach (name; names)"
+  '';
+
+  nativeBuildInputs = [
+    cmake ldcBootstrap lit lit.python llvm_15.dev makeWrapper ninja unzip
+  ]
+  ++ lib.optionals stdenv.hostPlatform.isDarwin [
+    darwin.apple_sdk.frameworks.Foundation
+  ]
+  ++ lib.optionals (!stdenv.hostPlatform.isDarwin) [
+    # https://github.com/NixOS/nixpkgs/pull/36378#issuecomment-385034818
+    gdb
+  ];
+
+  buildInputs = [ curl tzdata ];
+
+  cmakeFlags = [
+    "-DD_FLAGS=-d-version=TZDatabaseDir;-d-version=LibcurlPath;-J${pathConfig}"
+    "-DCMAKE_BUILD_TYPE=Release"
+  ];
+
+  postConfigure = ''
+    export DMD=$PWD/bin/ldmd2
+  '';
+
+  makeFlags = [ "DMD=$DMD" ];
+
+  fixNames = lib.optionalString stdenv.hostPlatform.isDarwin  ''
+    fixDarwinDylibNames() {
+      local flags=()
+
+      for fn in "$@"; do
+        flags+=(-change "$(basename "$fn")" "$fn")
+      done
+
+      for fn in "$@"; do
+        if [ -L "$fn" ]; then continue; fi
+        echo "$fn: fixing dylib"
+        install_name_tool -id "$fn" "''${flags[@]}" "$fn"
+      done
+    }
+
+    fixDarwinDylibNames $(find "$(pwd)/lib" -name "*.dylib")
+    export DYLD_LIBRARY_PATH=$(pwd)/lib
+  '';
+
+  # https://github.com/ldc-developers/ldc/issues/2497#issuecomment-459633746
+  additionalExceptions = lib.optionalString stdenv.hostPlatform.isDarwin
+    "|druntime-test-shared";
+
+  checkPhase = ''
+    # Build default lib test runners
+    ninja -j$NIX_BUILD_CORES all-test-runners
+
+    ${fixNames}
+
+    # Run dmd testsuite
+    export DMD_TESTSUITE_MAKE_ARGS="-j$NIX_BUILD_CORES DMD=$DMD"
+    ctest -V -R "dmd-testsuite"
+
+    # Build and run LDC D unittests.
+    ctest --output-on-failure -R "ldc2-unittest"
+
+    # Run LIT testsuite.
+    ctest -V -R "lit-tests"
+
+    # Run default lib unittests
+    ctest -j$NIX_BUILD_CORES --output-on-failure -E "ldc2-unittest|lit-tests|dmd-testsuite${additionalExceptions}"
+  '';
+
+  postInstall = ''
+    wrapProgram $out/bin/ldc2 \
+        --prefix PATH ":" "${targetPackages.stdenv.cc}/bin" \
+        --set-default CC "${targetPackages.stdenv.cc}/bin/cc"
+   '';
+
+  meta = with lib; {
+    description = "The LLVM-based D compiler";
+    homepage = "https://github.com/ldc-developers/ldc";
+    # from https://github.com/ldc-developers/ldc/blob/master/LICENSE
+    license = with licenses; [ bsd3 boost mit ncsa gpl2Plus ];
+    maintainers = with maintainers; [ ThomasMader lionello ];
+    platforms = [ "x86_64-linux" "i686-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+  };
+}