From d0465e3837a71afae2f1a6f42eb923350d826e27 Mon Sep 17 00:00:00 2001
From: Ralph Amissah <ralph.amissah@gmail.com>
Date: Wed, 27 Jan 2021 10:45:51 -0500
Subject: shell.nix project.nix spine.nix mkDub.nix

---
 nix/mkDub.nix | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

(limited to 'nix/mkDub.nix')

diff --git a/nix/mkDub.nix b/nix/mkDub.nix
index 8f4014b..2a6570f 100644
--- a/nix/mkDub.nix
+++ b/nix/mkDub.nix
@@ -1,8 +1,10 @@
 { pkgs ? import <nixpkgs> {},
   stdenv ? pkgs.stdenv,
-  ldc ? pkgs.ldc,
+  ldc ? null,
+  dcompiler ? pkgs.ldc,
   dub ? pkgs.dub
 }:
+assert dcompiler != null;
 with stdenv;
 let
   # Filter function to remove the .dub package folder from src
@@ -16,7 +18,7 @@ let
   fromDub = dubDep: mkDerivation rec {
     name = "${src.name}-${version}";
     version = rev-to-version dubDep.fetch.rev;
-    nativeBuildInputs = [ ldc dub ];
+    nativeBuildInputs = [ dcompiler dub ];
     src = dep2src dubDep;
     buildPhase = ''
       runHook preBuild
@@ -37,7 +39,7 @@ let
   # The target output of the Dub package
   targetOf = package: "${package.targetPath or "."}/${package.targetName or package.name}";
   # Remove reference to build tools and library sources
-  disallowedReferences = deps: [ ldc dub ] ++ builtins.map dep2src deps;
+  disallowedReferences = deps: [ dcompiler dub ] ++ builtins.map dep2src deps;
   removeExpr = refs: ''remove-references-to ${lib.concatMapStrings (ref: " -t ${ref}") refs}'';
 in {
   inherit fromDub;
@@ -52,10 +54,10 @@ in {
     ...
   } @ attrs: stdenv.mkDerivation (attrs // {
     pname = package.name;
-    nativeBuildInputs = [ ldc dub pkgs.removeReferencesTo ] ++ nativeBuildInputs;
+    nativeBuildInputs = [ dcompiler dub pkgs.removeReferencesTo ] ++ nativeBuildInputs;
     disallowedReferences = disallowedReferences deps;
     passthru = passthru // {
-      inherit dub ldc pkgs;
+      inherit dub dcompiler pkgs;
     };
     src = lib.cleanSourceWith {
       filter = filterDub;
@@ -68,7 +70,18 @@ in {
       runHook preBuild
       export HOME=$PWD
       ${lib.concatMapStringsSep "\n" dub-add-local deps}
-      dub build --compiler=ldc2 --build=release --combined --skip-registry=all
+      for dc_ in dmd ldmd2 gdmd; do
+        echo "check for D compiler $dc_"
+        dc=$(type -P $dc_ || echo "")
+        if [ ! "$dc" == "" ]; then
+          break
+        fi
+      done
+      if [ "$dc" == "" ]; then
+        exit "Error: could not find D compiler"
+      fi
+      echo "$dc_ used as D compiler to build $pname"
+      dub build --compiler=$dc --build=release --combined --skip-registry=all
       runHook postBuild
     '';
     checkPhase = ''
-- 
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