qtbase: add patch to make Qt5Config modules behave better with cmake builds

Currently if a project if using the cmake bbclass and the CMakeLists.txt file
uses find_package to find Qt5 and error like this is produced:

|   The imported target "Qt5::Core" references the file
|
|      "/qmake"
|
|   but this file does not exist.  Possible reasons include:

This is because OE_QMAKE_PATH_EXTERNAL_HOST_BINS is only set in the cmake_qt5 bblcass.

To make it work better in that case the Qt5Config files check if OE_QMAKE_PATH_EXTERNAL_HOST_BINS
is defined and bail out if not. For CMake this is the same as Qt5 wasn't found.

Signed-off-by: Pascal Bach <pascal.bach@siemens.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

2 files changed, 68 insertions, 0 deletions

diff --git a/recipes-qt/qt5/qtbase/0011-Pretend-Qt5-wasn-t-found-if-OE_QMAKE_PATH_EXTERNAL_H.patch b/recipes-qt/qt5/qtbase/0011-Pretend-Qt5-wasn-t-found-if-OE_QMAKE_PATH_EXTERNAL_H.patch
new file mode 100644
index 00000000..7a24459c
--- /dev/null
+++ b/recipes-qt/qt5/qtbase/0011-Pretend-Qt5-wasn-t-found-if-OE_QMAKE_PATH_EXTERNAL_H.patch
@@ -0,0 +1,67 @@
+From f5a949e17aa8b37491fbc414c38557c9920fa1e5 Mon Sep 17 00:00:00 2001
+From: Pascal Bach <pascal.bach@siemens.com>
+Date: Wed, 11 May 2016 15:20:41 +0200
+Subject: [PATCH] Pretend Qt5 wasn't found if OE_QMAKE_PATH_EXTERNAL_HOST_BINS
+ isn't set
+
+This prevents errors like:
+
+|   The imported target "Qt5::Core" references the file
+|
+|      "/qmake"
+|
+|   but this file does not exist.  Possible reasons include:
+
+Which happen if CMake is used without setting OE_QMAKE_PATH_EXTERNAL_HOST_BINS.
+To achieve this a check for OE_QMAKE_PATH_EXTERNAL_HOST_BINS is added to each Qt5*Config.cmake
+file. And in the case where the variable is not set we just return which is basically
+equal to telling CMake that Qt5 wasn't found.
+
+Upstream-Status: Pending
+  The patch only makes sense in connection with other patches included here.
+  Specifically this are:
+    - 0003-Add-external-hostbindir-option.patch
+    - 0010-Add-external-hostbindir-option-for-native-sdk.patch
+
+Signed-off-by: Pascal Bach <pascal.bach@siemens.com>
+
+---
+ mkspecs/features/data/cmake/Qt5BasicConfig.cmake.in | 5 +++++
+ src/corelib/Qt5Config.cmake.in                      | 5 +++++
+ 2 files changed, 10 insertions(+)
+
+diff --git a/mkspecs/features/data/cmake/Qt5BasicConfig.cmake.in b/mkspecs/features/data/cmake/Qt5BasicConfig.cmake.in
+index d2358ca..feb73c0 100644
+--- a/mkspecs/features/data/cmake/Qt5BasicConfig.cmake.in
++++ b/mkspecs/features/data/cmake/Qt5BasicConfig.cmake.in
+@@ -9,6 +9,11 @@ if (CMAKE_VERSION VERSION_LESS 3.0.0)
+ endif()
+ !!ENDIF
+ 
++if(NOT DEFINED OE_QMAKE_PATH_EXTERNAL_HOST_BINS)
++    message(WARNING "Skipping because OE_QMAKE_PATH_EXTERNAL_HOST_BINS is not defined")
++    return()
++endif()
++
+ !!IF !isEmpty(CMAKE_USR_MOVE_WORKAROUND)
+ !!IF !isEmpty(CMAKE_LIB_DIR_IS_ABSOLUTE)
+ set(_qt5$${CMAKE_MODULE_NAME}_install_prefix \"$$[QT_INSTALL_PREFIX]\")
+diff --git a/src/corelib/Qt5Config.cmake.in b/src/corelib/Qt5Config.cmake.in
+index a872d0e..233d663 100644
+--- a/src/corelib/Qt5Config.cmake.in
++++ b/src/corelib/Qt5Config.cmake.in
+@@ -3,6 +3,11 @@ if (CMAKE_VERSION VERSION_LESS 2.8.9)
+     message(FATAL_ERROR \"Qt5 requires at least CMake version 2.8.9\")
+ endif()
+ 
++if(NOT DEFINED OE_QMAKE_PATH_EXTERNAL_HOST_BINS)
++    message(WARNING "Skipping because OE_QMAKE_PATH_EXTERNAL_HOST_BINS is not defined")
++    return()
++endif()
++
+ if (NOT Qt5_FIND_COMPONENTS)
+     set(Qt5_NOT_FOUND_MESSAGE \"The Qt5 package requires at least one component\")
+     set(Qt5_FOUND False)
+-- 
+2.1.4
+
diff --git a/recipes-qt/qt5/qtbase_git.bb b/recipes-qt/qt5/qtbase_git.bb
index ee926f8f..72ef3ae7 100644
--- a/recipes-qt/qt5/qtbase_git.bb
+++ b/recipes-qt/qt5/qtbase_git.bb
@@ -21,6 +21,7 @@ SRC_URI += "\
     file://0007-linux-oe-g-Invert-conditional-for-defining-QT_SOCKLE.patch \
     file://0008-configure-paths-for-target-qmake-properly.patch \
     file://0011-Reorder-EGL-libraries-from-pkgconfig-and-defaults.patch \
+    file://0011-Pretend-Qt5-wasn-t-found-if-OE_QMAKE_PATH_EXTERNAL_H.patch \
 "
 
 DEPENDS += "qtbase-native"