From c745afadf4f7870fb398cf94ddf51652d6fed2d8 Mon Sep 17 00:00:00 2001
From: amesgen <amesgen@amesgen.de>
Date: Thu, 5 May 2022 18:47:37 +0200
Subject: [PATCH] lmdb: fix cross compilation to mingwW64

---
 pkgs/development/libraries/lmdb/bin-ext.patch | 21 +++++++++++++++++++
 pkgs/development/libraries/lmdb/default.nix   |  9 +++++---
 2 files changed, 27 insertions(+), 3 deletions(-)
 create mode 100644 pkgs/development/libraries/lmdb/bin-ext.patch

diff --git a/pkgs/development/libraries/lmdb/bin-ext.patch b/pkgs/development/libraries/lmdb/bin-ext.patch
new file mode 100644
index 00000000000..2d5af99772c
--- /dev/null
+++ b/pkgs/development/libraries/lmdb/bin-ext.patch
@@ -0,0 +1,21 @@
+diff --git a/libraries/liblmdb/Makefile b/libraries/liblmdb/Makefile
+index 612484e..2e6b562 100644
+--- a/libraries/liblmdb/Makefile
++++ b/libraries/liblmdb/Makefile
+@@ -27,6 +27,7 @@ CFLAGS	= $(THREADS) $(OPT) $(W) $(XCFLAGS)
+ LDLIBS	=
+ SOLIBS	=
+ SOEXT	= .so
++BINEXT  =
+ prefix	= /usr/local
+ exec_prefix = $(prefix)
+ bindir = $(exec_prefix)/bin
+@@ -49,7 +50,7 @@ install: $(ILIBS) $(IPROGS) $(IHDRS)
+ 	mkdir -p $(DESTDIR)$(libdir)
+ 	mkdir -p $(DESTDIR)$(includedir)
+ 	mkdir -p $(DESTDIR)$(mandir)/man1
+-	for f in $(IPROGS); do cp $$f $(DESTDIR)$(bindir); done
++	for f in $(IPROGS); do cp $$f$(BINEXT) $(DESTDIR)$(bindir); done
+ 	for f in $(ILIBS); do cp $$f $(DESTDIR)$(libdir); done
+ 	for f in $(IHDRS); do cp $$f $(DESTDIR)$(includedir); done
+ 	for f in $(IDOCS); do cp $$f $(DESTDIR)$(mandir)/man1; done
diff --git a/pkgs/development/libraries/lmdb/default.nix b/pkgs/development/libraries/lmdb/default.nix
index 0a3515db262..a8b5da5b56d 100644
--- a/pkgs/development/libraries/lmdb/default.nix
+++ b/pkgs/development/libraries/lmdb/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitLab }:
+{ lib, stdenv, fetchFromGitLab, windows }:
 
 stdenv.mkDerivation rec {
   pname = "lmdb";
@@ -14,17 +14,20 @@ stdenv.mkDerivation rec {
 
   postUnpack = "sourceRoot=\${sourceRoot}/libraries/liblmdb";
 
-  patches = [ ./hardcoded-compiler.patch ];
+  patches = [ ./hardcoded-compiler.patch ./bin-ext.patch ];
   patchFlags = [ "-p3" ];
 
   outputs = [ "bin" "out" "dev" ];
 
+  buildInputs = lib.optional stdenv.hostPlatform.isWindows windows.pthreads;
+
   makeFlags = [
     "prefix=$(out)"
     "CC=${stdenv.cc.targetPrefix}cc"
     "AR=${stdenv.cc.targetPrefix}ar"
   ]
-    ++ lib.optional stdenv.isDarwin "LDFLAGS=-Wl,-install_name,$(out)/lib/liblmdb.so";
+    ++ lib.optional stdenv.isDarwin "LDFLAGS=-Wl,-install_name,$(out)/lib/liblmdb.so"
+    ++ lib.optionals stdenv.hostPlatform.isWindows [ "SOEXT=.dll" "BINEXT=.exe" ];
 
   doCheck = true;
   checkTarget = "test";