debian/changelog

+qgis (2.18.18+dfsg-2) unstable; urgency=medium
+
+  * Add patch to add dependencies to wmsprovider QT4_WRAP_CPP macro.
+    Should fix parallel build.
+
+ -- Bas Couwenberg <sebastic@debian.org>  Wed, 28 Mar 2018 08:05:07 +0200
+
 qgis (2.18.18+dfsg-1) unstable; urgency=medium
 
   * Update symbols for other architectures.

debian/patches/series

@@ -6,3 +6,4 @@ occurred-typo.patch
 number-typo.patch
 columns-typo.patch
 wmsprovider-dependencies.patch
+wmsprovider-qt4_wrap_cpp-dependencies.patch

debian/patches/wmsprovider-dependencies.patch

@@ -7,6 +7,7 @@ Description: Add dependency on ui target to wms provider.
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Author: Bas Couwenberg <sebastic@debian.org>
 Forwarded: https://github.com/qgis/QGIS/pull/6692
+Applied-Upstream: https://github.com/qgis/QGIS/commit/0eb3cd4e9cd8d83bad667e3527f87118c0922971
 
 --- a/src/providers/wms/CMakeLists.txt
 +++ b/src/providers/wms/CMakeLists.txt

debian/patches/wmsprovider-qt4_wrap_cpp-dependencies.patch

+Description: Add custom target for QT4_WRAP_CPP macro.
+ Should fix parallel build.
+Author: Bas Couwenberg <sebastic@debian.org>
+
+--- a/src/providers/wms/CMakeLists.txt
++++ b/src/providers/wms/CMakeLists.txt
+@@ -26,6 +26,10 @@ SET (WMS_MOC_HDRS
+ 
+ QT4_WRAP_CPP (WMS_MOC_SRCS ${WMS_MOC_HDRS})
+ 
++ADD_CUSTOM_TARGET(wms_cpp ALL DEPENDS ${WMS_MOC_SRCS})
++
++ADD_DEPENDENCIES(wms_cpp qgis_gui ui)
++
+ INCLUDE_DIRECTORIES(
+   .
+   ../../core
+@@ -46,8 +50,6 @@ INCLUDE_DIRECTORIES(SYSTEM
+ ADD_LIBRARY(wmsprovider_a STATIC ${WMS_SRCS} ${WMS_MOC_SRCS})
+ ADD_LIBRARY(wmsprovider MODULE ${WMS_SRCS} ${WMS_MOC_SRCS})
+ 
+-ADD_DEPENDENCIES(wmsprovider qgis_gui ui)
+-
+ TARGET_LINK_LIBRARIES(wmsprovider
+   qgis_core
+   qgis_gui