From 48048824c4c63c605d39532ff9ebeb7328a580e7 Mon Sep 17 00:00:00 2001
From: Alexandre Esteves <alexandre.fmp.esteves@gmail.com>
Date: Thu, 9 Sep 2021 02:33:43 +0100
Subject: [PATCH] ghc8.10.7: fix mingw build

(cherry picked from commit eea8e3eacec12fe4e46d3ecb8e3cbbd03a10b2f0)
---
 pkgs/development/compilers/ghc/8.10.7.nix | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/compilers/ghc/8.10.7.nix b/pkgs/development/compilers/ghc/8.10.7.nix
index f3242f3e167..e3b09ecf155 100644
--- a/pkgs/development/compilers/ghc/8.10.7.nix
+++ b/pkgs/development/compilers/ghc/8.10.7.nix
@@ -75,6 +75,12 @@ let
     GhcRtsHcOpts += -fPIC
   '' + lib.optionalString targetPlatform.useAndroidPrebuilt ''
     EXTRA_CC_OPTS += -std=gnu99
+  ''
+  # While split sections are now enabled by default in ghc 8.8 for windows,
+  # they seem to lead to `too many sections` errors when building base for
+  # profiling.
+  + lib.optionalString targetPlatform.isWindows ''
+    SplitSections = NO
   '';
 
   # Splicer will pull out correct variations
@@ -91,7 +97,7 @@ let
 
   # ld.gold is disabled for musl libc due to https://sourceware.org/bugzilla/show_bug.cgi?id=23856
   # see #84670 and #49071 for more background.
-  useLdGold = targetPlatform.isLinux && !(targetPlatform.useLLVM or false) && !targetPlatform.isMusl;
+  useLdGold = targetPlatform.isLinux && !(targetPlatform.useLLVM or false) && !targetPlatform.isMusl && !targetPlatform.isWindows;
 
   runtimeDeps = [
     targetPackages.stdenv.cc.bintools
@@ -124,6 +130,13 @@ stdenv.mkDerivation (rec {
     # upstream patch. Don't forget to check backport status of the upstream patch
     # when adding new GHC releases in nixpkgs.
     ./respect-ar-path.patch
+
+    # cabal passes incorrect --host= when cross-compiling
+    # https://github.com/haskell/cabal/issues/5887
+    (fetchpatch {
+            url = "https://raw.githubusercontent.com/input-output-hk/haskell.nix/122bd81150386867da07fdc9ad5096db6719545a/overlays/patches/ghc/cabal-host.patch";
+      sha256 = "sha256:0yd0sajgi24sc1w5m55lkg2lp6kfkgpp3lgija2c8y3cmkwfpdc1";
+    })
   ] ++ lib.optionals stdenv.isDarwin [
     # Make Block.h compile with c++ compilers. Remove with the next release
     (fetchpatch {