From 355b55d00b2a7850305d37b58c58b87adafee192 Mon Sep 17 00:00:00 2001
From: sternenseemann <0rpkxez4ksa01gb3typccl0i@systemli.org>
Date: Fri, 7 May 2021 15:09:08 +0200
Subject: [PATCH 1/2] ghc8102Binary, ghc865Binary: don't build aarch64 on hydra

Unfortunately these compiler's normal binary versions exceed the maximum
output size on hydra and thus can't be built on there.

See also https://gitlab.haskell.org/ghc/ghc/-/issues/17051
---
 pkgs/development/compilers/ghc/8.10.2-binary.nix | 3 ++-
 pkgs/development/compilers/ghc/8.6.5-binary.nix  | 7 +++++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/compilers/ghc/8.10.2-binary.nix b/pkgs/development/compilers/ghc/8.10.2-binary.nix
index 02373d00b10..6119353174b 100644
--- a/pkgs/development/compilers/ghc/8.10.2-binary.nix
+++ b/pkgs/development/compilers/ghc/8.10.2-binary.nix
@@ -212,11 +212,12 @@ stdenv.mkDerivation rec {
     enableShared = true;
   };
 
-  meta = {
+  meta = rec {
     homepage = "http://haskell.org/ghc";
     description = "The Glasgow Haskell Compiler";
     license = lib.licenses.bsd3;
     platforms = ["x86_64-linux" "armv7l-linux" "aarch64-linux" "i686-linux" "x86_64-darwin"];
+    hydraPlatforms = builtins.filter (p: minimal || p != "aarch64-linux") platforms;
     maintainers = with lib.maintainers; [ lostnet ];
   };
 }
diff --git a/pkgs/development/compilers/ghc/8.6.5-binary.nix b/pkgs/development/compilers/ghc/8.6.5-binary.nix
index ca984c36957..a73731029f1 100644
--- a/pkgs/development/compilers/ghc/8.6.5-binary.nix
+++ b/pkgs/development/compilers/ghc/8.6.5-binary.nix
@@ -171,6 +171,9 @@ stdenv.mkDerivation rec {
     enableShared = true;
   };
 
-  meta.license = lib.licenses.bsd3;
-  meta.platforms = ["x86_64-linux" "aarch64-linux" "i686-linux" "x86_64-darwin"];
+  meta = rec {
+    license = lib.licenses.bsd3;
+    platforms = ["x86_64-linux" "aarch64-linux" "i686-linux" "x86_64-darwin"];
+    hydraPlatforms = builtins.filter (p: p != "aarch64-linux") platforms;
+  };
 }

From 8f070821412fa683ac80cbfc522954dac4e68c2e Mon Sep 17 00:00:00 2001
From: sternenseemann <0rpkxez4ksa01gb3typccl0i@systemli.org>
Date: Fri, 7 May 2021 15:13:37 +0200
Subject: [PATCH 2/2] haskell.compiler.ghc901: build using ghc8102BinaryMinimal
 on arm

ghc8102Binary doesn't build on hydra on arm since it exceeds the maximum
output size. This change works around this issue by using the minimal
version of that compiler instead.
---
 pkgs/top-level/haskell-packages.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index da70103ad6b..571fe677300 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -76,7 +76,11 @@ in {
       llvmPackages = pkgs.llvmPackages_9;
     };
     ghc901 = callPackage ../development/compilers/ghc/9.0.1.nix {
-      bootPkgs = packages.ghc8102Binary;
+      # aarch64 ghc8102Binary exceeds max output size on hydra
+      bootPkgs = if stdenv.isAarch64 || stdenv.isAarch32 then
+          packages.ghc8102BinaryMinimal
+        else
+          packages.ghc8102Binary;
       inherit (buildPackages.python3Packages) sphinx;
       buildLlvmPackages = buildPackages.llvmPackages_10;
       llvmPackages = pkgs.llvmPackages_10;