[OE-core] [PATCH] cmake.bbclass: avoid treating imports as system includes

[Andreas Müller]

CMake sets all imported headers as system headers. This causes trouble for c++
projects [1].

Thanks to Jack Mitchell for pointing to the setting [2]. Build tested upon
meta-qt5-extra-world which had lots of fallout before.

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70129
[2] http://lists.openembedded.org/pipermail/openembedded-core/2016-September/126067.html

Signed-off-by: Andreas Müller <schnitzeltony at googlemail.com>
---
 meta/classes/cmake.bbclass | 1 +
 1 file changed, 1 insertion(+)

diff --git a/meta/classes/cmake.bbclass b/meta/classes/cmake.bbclass
index 5203d8a..7091f8b 100644
--- a/meta/classes/cmake.bbclass
+++ b/meta/classes/cmake.bbclass
@@ -120,6 +120,7 @@ cmake_do_configure() {
 	  -DCMAKE_INSTALL_SO_NO_EXE=0 \
 	  -DCMAKE_TOOLCHAIN_FILE=${WORKDIR}/toolchain.cmake \
 	  -DCMAKE_VERBOSE_MAKEFILE=1 \
+	  -DCMAKE_NO_SYSTEM_FROM_IMPORTED=1 \
 	  ${EXTRA_OECMAKE} \
 	  -Wno-dev
 }
-- 
2.5.5