From d3f8d98df7e2afb5f264a46f526cf21db0b22b58 Mon Sep 17 00:00:00 2001
From: Etienne Laurin <etienne@atnnn.com>
Date: Tue, 21 Feb 2023 01:35:54 -0700
Subject: [PATCH] 7zz: cross-compile for mingw

---
 pkgs/tools/archivers/7zz/default.nix | 44 ++++++++++++++++++++++++++--
 1 file changed, 41 insertions(+), 3 deletions(-)

diff --git a/pkgs/tools/archivers/7zz/default.nix b/pkgs/tools/archivers/7zz/default.nix
index 150230f775a4..841d2acc2017 100644
--- a/pkgs/tools/archivers/7zz/default.nix
+++ b/pkgs/tools/archivers/7zz/default.nix
@@ -56,8 +56,45 @@ stdenv.mkDerivation rec {
   patches = [ ./fix-build-on-darwin.patch ];
   patchFlags = [ "-p0" ];
 
+  postPatch = lib.optionalString stdenv.hostPlatform.isMinGW ''
+    find . \( -iname '*.cpp' -o -iname '*.h' -o -iname '*.c' -o -iname '*.rc' \) -print0 \
+      | xargs -0 sed -i '
+        s/<Windows.h>/<windows.h>/
+        s/<WinIoCtl.h>/<winioctl.h>/
+        s/<ShlObj.h>/<shlobj.h>/
+        s/<CommCtrl.h>/<commctrl.h>/
+        s/<Shlwapi.h>/<shlwapi.h>/
+        s/<ShObjIdl.h>/<shobjidl.h>/
+        s/<Psapi.h>/<psapi.h>/
+        s/<WindowsX.h>/<windowsx.h>/
+        s/<WinBase.h>/<winbase.h>/
+        s/<TlHelp32.h>/<tlhelp32.h>/
+        s/<PrSht.h>/<prsht.h>/
+        s/<OleCtl.h>/<olectl.h>/
+        s/<NTSecAPI.h>/<ntsecapi.h>/
+        s/<MAPI.h>/<mapi.h>/
+        s/<InitGuid.h>/<initguid.h>/
+        s/<HtmlHelp.h>/<htmlhelp.h>/
+        s/<WinVer.h>/<winver.h>/
+        /#include/ s|\\|/|g
+      '
+    find . -iname '*mak*' -print0 \
+      | xargs -0 sed -i '
+        s/-lUser32/-luser32/g
+        s/-lOle32/-lole32/g
+        s/-lGdi32/-lgdi32/g
+        s/-lComctl32/-lcomctl32/g
+        s/-lComdlg32/-lcomdlg32/g
+      '
+    substituteInPlace CPP/7zip/7zip_gcc.mak C/7zip_gcc_c.mak \
+      --replace windres.exe ${stdenv.cc.targetPrefix}windres
+  '';
+
   NIX_CFLAGS_COMPILE = lib.optionals stdenv.isDarwin [
     "-Wno-deprecated-copy-dtor"
+  ] ++ lib.optionals stdenv.hostPlatform.isMinGW [
+    "-Wno-conversion"
+    "-Wno-unused-macros"
   ];
 
   inherit makefile;
@@ -73,7 +110,8 @@ stdenv.mkDerivation rec {
     # aarch64-darwin so we don't need additional changes for it
     ++ lib.optionals stdenv.isDarwin [ "MACOSX_DEPLOYMENT_TARGET=10.16" ]
     # it's the compression code with the restriction, see DOC/License.txt
-    ++ lib.optionals (!enableUnfree) [ "DISABLE_RAR_COMPRESS=true" ];
+    ++ lib.optionals (!enableUnfree) [ "DISABLE_RAR_COMPRESS=true" ]
+    ++ lib.optionals (stdenv.hostPlatform.isMinGW) [ "IS_MINGW=1" "MSYSTEM=1" ];
 
   nativeBuildInputs = lib.optionals useUasm [ uasm ];
 
@@ -84,7 +122,7 @@ stdenv.mkDerivation rec {
   installPhase = ''
     runHook preInstall
 
-    install -Dm555 -t $out/bin b/*/7zz
+    install -Dm555 -t $out/bin b/*/7zz${stdenv.hostPlatform.extensions.executable}
     install -Dm444 -t $out/share/doc/${pname} ../../../../DOC/*.txt
 
     runHook postInstall
@@ -109,7 +147,7 @@ stdenv.mkDerivation rec {
       # the unRAR compression code is disabled by default
       lib.optionals enableUnfree [ unfree ];
     maintainers = with maintainers; [ anna328p peterhoeg jk ];
-    platforms = platforms.unix;
+    platforms = platforms.unix ++ platforms.windows;
     mainProgram = "7zz";
   };
 }