From: Fabrice Fontaine Date: Sat, 26 Dec 2020 10:25:00 +0000 (+0100) Subject: package/opencv3: fix build with protobuf and gcc < 6 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=bf96f4e8d327a8d7a4b1ab732486aced3d1d8da8;p=buildroot.git package/opencv3: fix build with protobuf and gcc < 6 Fix the folloing build failure with protobuf (enabled since commit 31c68a449ecd7da61ecfd909bea7ce799f9a6450) and gcc 5.3.0: [ 53%] Building CXX object modules/dnn/CMakeFiles/opencv_dnn.dir/opencv-caffe.pb.cc.o In file included from /home/peko/autobuild/instance-1/output-1/per-package/opencv3/host/opt/ext-toolchain/mips64el-buildroot-linux-uclibc/include/c++/5.5.0/atomic:38:0, from /home/peko/autobuild/instance-1/output-1/per-package/opencv3/host/mips64el-buildroot-linux-uclibc/sysroot/usr/include/google/protobuf/io/coded_stream.h:115, from /home/peko/autobuild/instance-1/output-1/build/opencv3-3.4.12/buildroot-build/modules/dnn/opencv-caffe.pb.h:23, from /home/peko/autobuild/instance-1/output-1/build/opencv3-3.4.12/buildroot-build/modules/dnn/opencv-caffe.pb.cc:4: /home/peko/autobuild/instance-1/output-1/per-package/opencv3/host/opt/ext-toolchain/mips64el-buildroot-linux-uclibc/include/c++/5.5.0/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support must be enabled with the -std=c++11 or -std=gnu++11 compiler options. #error This file requires compiler and library support \ ^ Fixes: - http://autobuild.buildroot.org/results/7caf175af039054a032b8f63b458b3940d9ec0f3 Signed-off-by: Fabrice Fontaine Signed-off-by: Peter Korsgaard --- diff --git a/package/opencv3/opencv3.mk b/package/opencv3/opencv3.mk index 231d44395e..b1b86ba71d 100644 --- a/package/opencv3/opencv3.mk +++ b/package/opencv3/opencv3.mk @@ -287,7 +287,9 @@ OPENCV3_CONF_OPTS += -DWITH_PNG=OFF endif ifeq ($(BR2_PACKAGE_OPENCV3_WITH_PROTOBUF),y) +# protobuf needs c++11 (since 3.6.0) OPENCV3_CONF_OPTS += \ + -DENABLE_CXX11=ON \ -DPROTOBUF_UPDATE_FILES=ON \ -DWITH_PROTOBUF=ON OPENCV3_DEPENDENCIES += protobuf