Issue
I am using instructions here and here to build OpenWRT in ubuntu but am getting:
make[4]: Entering directory '~/openwrt/build_dir/host/cmake-3.11.1/Bootstrap.cmk'
make[4]: 'cmake' is up to date.
make[4]: Leaving directory '~/openwrt/build_dir/host/cmake-3.11.1/Bootstrap.cmk'
loading initial cache file ~/openwrt/build_dir/host/cmake-3.11.1/Bootstrap.cmk/InitialCacheFlags.cmake
CMake Error at CMakeLists.txt:92 (message):
The C++ compiler does not support C++11 (e.g. std::unique_ptr).
-- Configuring incomplete, errors occurred!
There was a solution to a similar problem here, however it is not clear to me which CMakeLists.txt file is the 'root' in my case. Not seeing much on the OpenWRT forums (or search engines in general) about this fail.
The impression I get is that the CMake installation is downloaded by the OpenWRT builder itself, as I do not have CMake installed and installing cmake resolved nothing.
Tried checking out latest OpenWRT v18.06.2. When that failed to build I deleted the cloned directory and tried v18.06.0-rc2. There was no improvement.
Also tried
export CMAKE_CXX_STANDARD=11
before running 'make' ... it did not resolve the issue.
The state of my g++ install:
$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 7.3.0-27ubuntu1~18.04' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-7 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 7.3.0 (Ubuntu 7.3.0-27ubuntu1~18.04)
Well, that's 5 hours I'm out of ideas. Could this be a misconfiguration or a bug on the dev end?
If a misconfiguration, what could be set up wrong?
Solution
I paste my solution here so that someone might get my hint (or it might not because of this reason)
after search millions of pages and people just talk about why but not how, my solution is simply:
copied cmake source code to my system drive. if you make cmake on a remote hardrive it will fail and error just like above
Answered By - Nicholas Jela
