diff --git a/Makefile.am b/Makefile.am
index 3dd39101..25fa3289 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -44,3 +44,50 @@ libvkd3d.pc: $(srcdir)/libs/vkd3d/libvkd3d.pc.in
 		-e 's![@]libdir[@]!$(libdir)!g' \
 		-e 's![@]PACKAGE_VERSION[@]!$(PACKAGE_VERSION)!g' \
 		$< > $@
+
+## Cross-compile tests
+cross_implibs = crosslibs/d3d12
+CROSS_CPPFLAGS = -I$(srcdir)/include -I$(srcdir)/include/private -I$(builddir)/include
+
+if HAS_CROSSTARGET32
+CROSS32_CC = @CROSSCC32@
+CROSS32_DLLTOOL = @CROSSTARGET32@-dlltool
+CROSS32_IMPLIBS = $(cross_implibs:=.cross32.a)
+CROSS32_EXEFILES = $(vkd3d_tests:=.cross32.exe)
+CROSS32_FILES = $(CROSS32_IMPLIBS) $(CROSS32_EXEFILES)
+
+CLEANFILES += $(CROSS32_FILES)
+crosstest32: $(widl_headers) $(CROSS32_FILES)
+
+$(CROSS32_IMPLIBS): %.cross32.a: %.cross32.def
+	${MKDIR_P} crosslibs
+	$(CROSS32_DLLTOOL) -k -m i386 --as-flags=-32 -d $< -l $@
+
+$(CROSS32_EXEFILES): %.cross32.exe: %.c $(CROSS32_IMPLIBS)
+	$(CROSS32_CC) $(CROSS_CPPFLAGS) -o $@ $< $(CROSS32_IMPLIBS)
+else
+crosstest32:
+endif
+
+if HAS_CROSSTARGET64
+CROSS64_CC = @CROSSCC64@
+CROSS64_DLLTOOL = @CROSSTARGET64@-dlltool
+CROSS64_IMPLIBS = $(cross_implibs:=.cross64.a)
+CROSS64_EXEFILES = $(vkd3d_tests:=.cross64.exe)
+CROSS64_FILES = $(CROSS64_IMPLIBS) $(CROSS64_EXEFILES)
+
+CLEANFILES += $(CROSS64_FILES)
+crosstest64: $(widl_headers) $(CROSS64_FILES)
+
+$(CROSS64_IMPLIBS): %.cross64.a: %.cross64.def
+	${MKDIR_P} crosslibs
+	$(CROSS64_DLLTOOL) -k -m i386:x86-64 --as-flags=-64 -d $< -l $@
+
+$(CROSS64_EXEFILES): %.cross64.exe: %.c $(CROSS64_IMPLIBS)
+	$(CROSS64_CC) $(CROSS_CPPFLAGS) -o $@ $< $(CROSS64_IMPLIBS)
+else
+crosstest64:
+endif
+
+.PHONY: crosstest crosstest32 crosstest64
+crosstest: crosstest32 crosstest64
diff --git a/configure.ac b/configure.ac
index e9285663..6dd107ed 100644
--- a/configure.ac
+++ b/configure.ac
@@ -58,6 +58,13 @@ AC_LINK_IFELSE(
     AC_DEFINE([HAVE_SYNC_SUB_AND_FETCH], [1], [Define to 1 if you have __sync_sub_and_fetch.])],
     [AC_MSG_RESULT([no])])
 
+dnl Check for cross compilers
+VKD3D_CHECK_MINGW32_PROG(CROSSCC32, CROSSTARGET32, false)
+VKD3D_CHECK_MINGW64_PROG(CROSSCC64, CROSSTARGET64, false)
+
+AM_CONDITIONAL([HAS_CROSSTARGET32], [test "x$CROSSTARGET32" != xfalse])
+AM_CONDITIONAL([HAS_CROSSTARGET64], [test "x$CROSSTARGET64" != xfalse])
+
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT
 
diff --git a/crosslibs/d3d12.cross32.def b/crosslibs/d3d12.cross32.def
new file mode 100644
index 00000000..d3d62b8f
--- /dev/null
+++ b/crosslibs/d3d12.cross32.def
@@ -0,0 +1,7 @@
+LIBRARY D3D12.dll
+
+EXPORTS
+    D3D12CreateDevice@16 @101
+    D3D12GetDebugInterface@8 @102
+    D3D12CreateRootSignatureDeserializer@16 @106
+    D3D12SerializeRootSignature@16 @107
diff --git a/crosslibs/d3d12.cross64.def b/crosslibs/d3d12.cross64.def
new file mode 100644
index 00000000..c61b3145
--- /dev/null
+++ b/crosslibs/d3d12.cross64.def
@@ -0,0 +1,7 @@
+LIBRARY D3D12.dll
+
+EXPORTS
+    D3D12CreateDevice @101
+    D3D12GetDebugInterface @102
+    D3D12CreateRootSignatureDeserializer @106
+    D3D12SerializeRootSignature @107
diff --git a/include/vkd3d_windows.h b/include/vkd3d_windows.h
index 55da7c0f..c1f9c7ff 100644
--- a/include/vkd3d_windows.h
+++ b/include/vkd3d_windows.h
@@ -182,7 +182,15 @@ typedef struct SECURITY_ATTRIBUTES SECURITY_ATTRIBUTES;
 # define IsEqualGUID(guid1, guid2) (!memcmp(guid1, guid2, sizeof(GUID)))
 #endif
 
+#elif !defined(__WIDL__)
+
+# include <windows.h>
+
+# ifndef __C89_NAMELESS
+#  define __C89_NAMELESS
+#  define __C89_NAMELESSUNIONNAME
+# endif  /* __C89_NAMELESS */
+
 #endif  /* _WIN32 */
 
-
 #endif  /* __VKD3D_WINDOWS_H */
diff --git a/m4/check-mingw-prog.m4 b/m4/check-mingw-prog.m4
new file mode 100644
index 00000000..a5f0af26
--- /dev/null
+++ b/m4/check-mingw-prog.m4
@@ -0,0 +1,56 @@
+dnl VKD3D_CHECK_MINGW32_PROG(variable, crosstarget-variable, [value-if-not-found], [path])
+AC_DEFUN([VKD3D_CHECK_MINGW32_PROG],
+[
+AC_SUBST([$2], [$3])dnl
+ac_prefix_list="m4_foreach([ac_vkd3d_prefix], [w64-mingw32, pc-mingw32, mingw32msvc, mingw32],
+    m4_foreach([ac_vkd3d_cpu], [i686, i586, i486, i386], [ac_vkd3d_cpu-ac_vkd3d_prefix-gcc ]))
+    mingw32-gcc"
+AC_CHECK_PROGS([$1], [$ac_prefix_list], [$3], [$4])
+if test "x[$]$1" != x$3
+then
+    ac_vkd3d_save_CC="$CC"
+    CC="[$]$1"
+    AC_MSG_CHECKING([whether $CC works])
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
+                      [AC_MSG_RESULT([yes])
+                      set x [$]$1
+                      shift
+                      while test "[$]#" -ge 1
+                      do
+                            case "[$]1" in
+                                *-gcc) $2=`expr "[$]1" : '\(.*\)-gcc'` ;;
+                            esac
+                            shift
+                      done],
+                      [AC_MSG_RESULT([no])])
+    CC="$ac_vkd3d_save_CC"
+fi
+])
+
+dnl VKD3D_CHECK_MINGW64_PROG(variable, crosstarget-variable, [value-if-not-found], [path])
+AC_DEFUN([VKD3D_CHECK_MINGW64_PROG],
+[
+AC_SUBST([$2], [$3])dnl
+ac_prefix_list="m4_foreach([ac_vkd3d_prefix], [pc-mingw32, w64-mingw32, mingw32msvc],
+    m4_foreach([ac_vkd3d_cpu], [x86_64, amd64], [ac_vkd3d_cpu-ac_vkd3d_prefix-gcc ]))"
+AC_CHECK_PROGS([$1], [$ac_prefix_list], [$3], [$4])
+if test "x[$]$1" != x$3
+then
+    ac_vkd3d_save_CC="$CC"
+    CC="[$]$1"
+    AC_MSG_CHECKING([whether $CC works])
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
+                      [AC_MSG_RESULT([yes])
+                      set x [$]$1
+                      shift
+                      while test "[$]#" -ge 1
+                      do
+                            case "[$]1" in
+                                *-gcc) $2=`expr "[$]1" : '\(.*\)-gcc'` ;;
+                            esac
+                            shift
+                      done],
+                      [AC_MSG_RESULT([no])])
+    CC="$ac_vkd3d_save_CC"
+fi
+])
diff --git a/tests/d3d12.c b/tests/d3d12.c
index 3e00a1ab..14cdc7bd 100644
--- a/tests/d3d12.c
+++ b/tests/d3d12.c
@@ -20,9 +20,6 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
-#define INITGUID
-#include "vkd3d_test.h"
-#include "vkd3d_windows.h"
 
 /* Hack for MinGW-w64 headers.
  *
@@ -34,14 +31,21 @@
  * specifiers" compiler error.
  */
 #ifdef __MINGW32__
-#include <_mingw.h>
+# include <_mingw.h>
 # ifdef __MINGW64_VERSION_MAJOR
 #  undef __forceinline
 #  define __forceinline __inline__ __attribute__((__always_inline__,__gnu_inline__))
 # endif
+
+# define _HRESULT_DEFINED
+typedef int HRESULT;
 #endif
 
+#define INITGUID
 #define COBJMACROS
+#include "vkd3d_test.h"
+#include "vkd3d_windows.h"
+
 #define WIDL_C_INLINE_WRAPPERS
 #include "d3d12.h"
 
@@ -88,7 +92,7 @@ static void test_create_device(void)
     check_interface(device, &IID_ID3D12Device, TRUE);
 
     refcount = ID3D12Device_Release(device);
-    ok(!refcount, "ID3D12Device has %u references left.\n", refcount);
+    ok(!refcount, "ID3D12Device has %u references left.\n", (unsigned int)refcount);
 
     hr = D3D12CreateDevice(NULL, D3D_FEATURE_LEVEL_11_0, &IID_ID3D12Device, (void **)&device);
     ok(hr == S_OK, "D3D12CreateDevice failed, hr %#x.\n", hr);