-Werror,-Wundef (clang-cl)

Change-Id: Ie63408ddd3216b9012530f65f93c98cf04f0deca
Reviewed-on: https://gerrit.libreoffice.org/46197Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

external/libgpg-error/UnpackedTarball_libgpg-error.mk

@@ -20,6 +20,7 @@ $(eval $(call gb_UnpackedTarball_add_patches,libgpg-error, \
 	$(if $(filter MSC,$(COM)),external/libgpg-error/w32-build-fixes-3.patch.1) \
 	$(if $(filter MSC,$(COM)),external/libgpg-error/w32-disable-dllinit.patch.1) \
 	external/libgpg-error/w32-build-fixes-4.patch \
+	external/libgpg-error/clang-cl.patch \
 ))
 
 # vim: set noet sw=4 ts=4:

external/libgpg-error/clang-cl.patch

+--- src/gpg-error.h.in
++++ src/gpg-error.h.in
+@@ -141,7 +141,7 @@
+ 
+ 
+ /* GCC feature test.  */
+-#if __GNUC__
++#if defined __GNUC__
+ # define _GPG_ERR_GCC_VERSION (__GNUC__ * 10000 \
+                                + __GNUC_MINOR__ * 100 \
+                                + __GNUC_PATCHLEVEL__)