cmake.bbclass: avoid treating imports as system includes

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

(From OE-Core rev: a5bf690e27a32c5470a4e110ab58ed0a92b9d039)

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/meta/classes/cmake.bbclass b/meta/classes/cmake.bbclass
index 5203d8aca1..7091f8ba81 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
 }