nix overlays introduced and tracked

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+-*- 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=