Fix export of virConnectAuthPtrDefault for MinGW builds

Use the __declspec(dllexport/dllimport) stuff to export the symbol,
otherwise accessing virConnectAuthPtrDefault triggers a segfault.

configure.ac

@@ -1732,6 +1732,7 @@ CYGWIN_EXTRA_LDFLAGS=
 CYGWIN_EXTRA_LIBADD=
 CYGWIN_EXTRA_PYTHON_LIBADD=
 MINGW_EXTRA_LDFLAGS=
+WIN32_EXTRA_CFLAGS=
 case "$host" in
   *-*-cygwin*)
     CYGWIN_EXTRA_LDFLAGS="-no-undefined"
@@ -1744,10 +1745,20 @@ case "$host" in
     MINGW_EXTRA_LDFLAGS="-no-undefined"
     ;;
 esac
+case "$host" in
+  *-*-mingw* | *-*-cygwin* | *-*-msvc* )
+    # If the host is Windows, and shared libraries are disabled, we
+    # need to add -DLIBVIRT_STATIC to the CFLAGS for proper linking
+    if test "x$enable_shared" = "xno"; then
+      WIN32_EXTRA_CFLAGS="-DLIBVIRT_STATIC"
+    fi
+    ;;
+esac
 AC_SUBST([CYGWIN_EXTRA_LDFLAGS])
 AC_SUBST([CYGWIN_EXTRA_LIBADD])
 AC_SUBST([CYGWIN_EXTRA_PYTHON_LIBADD])
 AC_SUBST([MINGW_EXTRA_LDFLAGS])
+AC_SUBST([WIN32_EXTRA_CFLAGS])
 
 dnl Look for windres to build a Windows icon resource.
 AC_CHECK_TOOL([WINDRES], [windres], [no])

docs/apibuild.py

@@ -28,6 +28,7 @@ ignored_words = {
   "ATTRIBUTE_UNUSED": (0, "macro keyword"),
   "ATTRIBUTE_SENTINEL": (0, "macro keyword"),
   "VIR_DEPRECATED": (0, "macro keyword"),
+  "VIR_EXPORT_VAR": (0, "macro keyword"),
   "WINAPI": (0, "Windows keyword"),
   "__declspec": (3, "Windows keyword"),
   "__stdcall": (0, "Windows keyword"),

include/libvirt/libvirt.h.in

@@ -29,6 +29,20 @@ extern "C" {
 # endif
 #endif /* VIR_DEPRECATED */
 
+#ifdef WIN32
+# ifdef LIBVIRT_STATIC
+#  define VIR_EXPORT_VAR extern
+# else
+#  ifdef IN_LIBVIRT
+#   define VIR_EXPORT_VAR __declspec(dllexport)
+#  else
+#   define VIR_EXPORT_VAR __declspec(dllimport) extern
+#  endif
+# endif
+#else
+# define VIR_EXPORT_VAR extern
+#endif
+
 /**
  * virConnect:
  *
@@ -499,7 +513,7 @@ struct _virConnectAuth {
 typedef struct _virConnectAuth virConnectAuth;
 typedef virConnectAuth *virConnectAuthPtr;
 
-extern virConnectAuthPtr virConnectAuthPtrDefault;
+VIR_EXPORT_VAR virConnectAuthPtr virConnectAuthPtrDefault;
 
 /**
  * VIR_UUID_BUFLEN:

src/Makefile.am

@@ -20,7 +20,9 @@ INCLUDES =							\
 		-DLOCAL_STATE_DIR=\""$(localstatedir)"\"	\
 		-DGETTEXT_PACKAGE=\"$(PACKAGE)\"		\
 		$(WARN_CFLAGS)					\
-		$(LOCK_CHECKING_CFLAGS)
+		$(LOCK_CHECKING_CFLAGS)			\
+		-DIN_LIBVIRT				\
+		$(WIN32_EXTRA_CFLAGS)
 
 EXTRA_DIST = $(conf_DATA)