From 5e8e75a0c6ff626a3dbff3d573695fdcb92bd348 Mon Sep 17 00:00:00 2001
From: midchildan <git@midchildan.org>
Date: Tue, 8 Sep 2020 23:27:56 +0900
Subject: [PATCH] dmd: relax ld purity check for checkPhase

Fix #97420
---
 pkgs/development/compilers/dmd/default.nix | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/compilers/dmd/default.nix b/pkgs/development/compilers/dmd/default.nix
index a6d4f7e1e20a..4bfd6298c8f7 100644
--- a/pkgs/development/compilers/dmd/default.nix
+++ b/pkgs/development/compilers/dmd/default.nix
@@ -115,13 +115,21 @@ stdenv.mkDerivation rec {
 
   doCheck = true;
 
+  # 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 = ''
     cd dmd
-    make -j$NIX_BUILD_CORES -C test -f Makefile PIC=1 CC=$CXX DMD=${pathToDmd} BUILD=release SHELL=$SHELL
+    NIX_ENFORCE_PURITY= \
+      make -j$NIX_BUILD_CORES -C test -f Makefile PIC=1 CC=$CXX DMD=${pathToDmd} BUILD=release SHELL=$SHELL
+
     cd ../druntime
-    make -j$NIX_BUILD_CORES -f posix.mak unittest PIC=1 DMD=${pathToDmd} BUILD=release
+    NIX_ENFORCE_PURITY= \
+      make -j$NIX_BUILD_CORES -f posix.mak unittest PIC=1 DMD=${pathToDmd} BUILD=release
+
     cd ../phobos
-    make -j$NIX_BUILD_CORES -f posix.mak unittest BUILD=release ENABLE_RELEASE=1 PIC=1 DMD=${pathToDmd} DFLAGS="-version=TZDatabaseDir -version=LibcurlPath -J$(pwd)"
+    NIX_ENFORCE_PURITY= \
+      make -j$NIX_BUILD_CORES -f posix.mak unittest BUILD=release ENABLE_RELEASE=1 PIC=1 DMD=${pathToDmd} DFLAGS="-version=TZDatabaseDir -version=LibcurlPath -J$(pwd)"
+
     cd ..
   '';