From 629e8da3aa6da507bc360385f5f341471ef57a89 Mon Sep 17 00:00:00 2001
From: Marko Durkovic <marko@miding.de>
Date: Tue, 9 Dec 2014 12:16:27 +0100
Subject: [PATCH 1/4] Explicitly include required C headers

---
 src/download-via-ssh/download-via-ssh.cc | 1 +
 src/libmain/shared.cc                    | 1 +
 src/libstore/optimise-store.cc           | 1 +
 src/libstore/remote-store.cc             | 1 +
 src/libutil/monitor-fd.hh                | 1 +
 5 files changed, 5 insertions(+)

diff --git a/src/download-via-ssh/download-via-ssh.cc b/src/download-via-ssh/download-via-ssh.cc
index b64455eb..164c24b4 100644
--- a/src/download-via-ssh/download-via-ssh.cc
+++ b/src/download-via-ssh/download-via-ssh.cc
@@ -9,6 +9,7 @@
 #include "store-api.hh"
 
 #include <iostream>
+#include <stdlib.h>
 #include <unistd.h>
 
 using namespace nix;
diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
index ef4ea370..bf5688a1 100644
--- a/src/libmain/shared.cc
+++ b/src/libmain/shared.cc
@@ -11,6 +11,7 @@
 #include <exception>
 #include <algorithm>
 
+#include <stdlib.h>
 #include <sys/time.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/src/libstore/optimise-store.cc b/src/libstore/optimise-store.cc
index dd18d66f..fb560767 100644
--- a/src/libstore/optimise-store.cc
+++ b/src/libstore/optimise-store.cc
@@ -4,6 +4,7 @@
 #include "local-store.hh"
 #include "globals.hh"
 
+#include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index 650f1779..cabde051 100644
--- a/src/libstore/remote-store.cc
+++ b/src/libstore/remote-store.cc
@@ -10,6 +10,7 @@
 #include <sys/stat.h>
 #include <sys/socket.h>
 #include <sys/un.h>
+#include <errno.h>
 #include <fcntl.h>
 
 #include <iostream>
diff --git a/src/libutil/monitor-fd.hh b/src/libutil/monitor-fd.hh
index 72d23fb6..e99869ef 100644
--- a/src/libutil/monitor-fd.hh
+++ b/src/libutil/monitor-fd.hh
@@ -3,6 +3,7 @@
 #include <thread>
 #include <atomic>
 
+#include <stdlib.h>
 #include <poll.h>
 #include <sys/types.h>
 #include <unistd.h>

From 936f68668c191ca6f904dd868fe364aeba1d531f Mon Sep 17 00:00:00 2001
From: Marko Durkovic <marko@miding.de>
Date: Tue, 9 Dec 2014 12:20:27 +0100
Subject: [PATCH 2/4] Set custom compiler flags on Cygwin

---
 mk/lib.mk | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/mk/lib.mk b/mk/lib.mk
index 56e162d5..f7c8c6b3 100644
--- a/mk/lib.mk
+++ b/mk/lib.mk
@@ -29,8 +29,13 @@ mandir ?= $(prefix)/share/man
 BUILD_SHARED_LIBS ?= 1
 
 ifeq ($(BUILD_SHARED_LIBS), 1)
-  GLOBAL_CFLAGS += -fPIC
-  GLOBAL_CXXFLAGS += -fPIC
+  ifeq (CYGWIN,$(findstring CYGWIN,$(OS)))
+    GLOBAL_CFLAGS += -U__STRICT_ANSI__
+    GLOBAL_CXXFLAGS += -U__STRICT_ANSI__
+  else
+    GLOBAL_CFLAGS += -fPIC
+    GLOBAL_CXXFLAGS += -fPIC
+  endif
   ifneq ($(OS), Darwin)
    ifneq ($(OS), SunOS)
     GLOBAL_LDFLAGS += -Wl,--no-copy-dt-needed-entries

From 4872677ffafce60bf863583804bb5700601ad7a4 Mon Sep 17 00:00:00 2001
From: Marko Durkovic <marko@miding.de>
Date: Tue, 9 Dec 2014 12:22:12 +0100
Subject: [PATCH 3/4] Fix library handling on Cygwin

1. Shared lib extension is .dll
2. Shared libs are installed to $(prefix)/bin
3. Linker does not support -z flag
---
 mk/libraries.mk | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/mk/libraries.mk b/mk/libraries.mk
index 3b91c699..3b292e98 100644
--- a/mk/libraries.mk
+++ b/mk/libraries.mk
@@ -3,7 +3,11 @@ libs-list :=
 ifeq ($(OS), Darwin)
   SO_EXT = dylib
 else
-  SO_EXT = so
+  ifeq (CYGWIN,$(findstring CYGWIN,$(OS)))
+    SO_EXT = dll
+  else
+    SO_EXT = so
+  endif
 endif
 
 # Build a library with symbolic name $(1).  The library is defined by
@@ -50,7 +54,11 @@ define build-library
   $(1)_OBJS := $$(addsuffix .o, $$(basename $$(_srcs)))
   _libs := $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_PATH))
 
-  $(1)_INSTALL_DIR ?= $$(libdir)
+  ifeq (CYGWIN,$(findstring CYGWIN,$(OS)))
+    $(1)_INSTALL_DIR ?= $$(bindir)
+  else
+    $(1)_INSTALL_DIR ?= $$(libdir)
+  endif
 
   $(1)_LDFLAGS_USE :=
   $(1)_LDFLAGS_USE_INSTALLED :=
@@ -65,7 +73,9 @@ define build-library
       endif
     else
       ifneq ($(OS), Darwin)
-        $(1)_LDFLAGS += -Wl,-z,defs
+        ifneq (CYGWIN,$(findstring CYGWIN,$(OS)))
+          $(1)_LDFLAGS += -Wl,-z,defs
+        endif
       endif
     endif
 

From f665c5d9b368cba0ca153323a805844f179e8bee Mon Sep 17 00:00:00 2001
From: Marko Durkovic <marko@miding.de>
Date: Tue, 9 Dec 2014 12:25:25 +0100
Subject: [PATCH 4/4] Link against perl.dll on Cygwin

---
 perl/local.mk | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/perl/local.mk b/perl/local.mk
index 8ff60e9c..73d8a7c9 100644
--- a/perl/local.mk
+++ b/perl/local.mk
@@ -29,6 +29,12 @@ ifeq ($(perlbindings), yes)
     -I$(shell $(perl) -e 'use Config; print $$Config{archlibexp};')/CORE \
     -D_FILE_OFFSET_BITS=64 -Wno-unused-variable -Wno-literal-suffix -Wno-reserved-user-defined-literal
 
+  ifeq (CYGWIN,$(findstring CYGWIN,$(OS)))
+    archlib = $(shell perl -E 'use Config; print $$Config{archlib};')
+    libperl = $(shell perl -E 'use Config; print $$Config{libperl};')
+    Store_LDFLAGS = $(shell find ${archlib} -name ${libperl})
+  endif
+
   Store_ALLOW_UNDEFINED = 1
 
   Store_FORCE_INSTALL = 1