I’m trying to build CMake 3.15.5 on a 20.04 xubuntu machine (but I also tried 18.04 and 20.10 with the same results).
(actually I want to build host-cmake in buildroot 2020.02.1)
The error is as follows:
loading initial cache file /home/max/Lavori/nova/src/repos/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/Bootstrap.cmk/InitialCacheFlags.cmake
-- The C compiler identification is GNU 9.3.0
-- The CXX compiler identification is GNU 9.3.0
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/g++
-- Check for working CXX compiler: /usr/bin/g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Checking if compiler supports C11 _Thread_local
-- Checking if compiler supports C11 _Thread_local - yes
-- Checking if compiler supports needed C++17 constructs
-- Checking if compiler supports needed C++17 constructs - yes
-- Checking if compiler supports C++ make_unique
-- Checking if compiler supports C++ make_unique - no
-- Checking if compiler supports C++ unique_ptr
-- Checking if compiler supports C++ unique_ptr - no
CMake Error at CMakeLists.txt:92 (message):
The C++ compiler does not support C++11 (e.g. std::unique_ptr).
-- Configuring incomplete, errors occurred!
See also "/home/max/Lavori/nova/src/repos/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/CMakeFiles/CMakeOutput.log".
See also "/home/max/Lavori/nova/src/repos/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/CMakeFiles/CMakeError.log".
---------------------------------------------
Error when bootstrapping CMake:
Problem while running initial CMake
I am absolutely sure that g++ 9.3.0 supports C++11, so where could the problem be?
Here is the CMakeError.log file:
Determining if compiler supports C++ make_unique failed with the following output:
Change Dir: /home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/CMakeFiles/CMakeTmp
Run Build Command(s):/usr/bin/make cmTC_f5a77/fast && make[2]: Entering directory '/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/CMakeFiles/CMakeTmp'
make[2]: Warning: File 'Makefile' has modification time 0,27 s in the future
make -f CMakeFiles/cmTC_f5a77.dir/build.make CMakeFiles/cmTC_f5a77.dir/build
make[3]: Entering directory '/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/CMakeFiles/CMakeTmp'
make[3]: Warning: File 'CMakeFiles/cmTC_f5a77.dir/flags.make' has modification time 0,26 s in the future
Building CXX object CMakeFiles/cmTC_f5a77.dir/cm_cxx_make_unique.cxx.o
/usr/bin/g++ -O2 -std=gnu++17 -o CMakeFiles/cmTC_f5a77.dir/cm_cxx_make_unique.cxx.o -c /home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/Source/Checks/cm_cxx_make_unique.cxx
Linking CXX executable cmTC_f5a77
/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/Bootstrap.cmk/cmake -E cmake_link_script CMakeFiles/cmTC_f5a77.dir/link.txt --verbose=1
/usr/bin/g++ -O2 -L/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/host/lib -Wl,-rpath,/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/host/lib CMakeFiles/cmTC_f5a77.dir/cm_cxx_make_unique.cxx.o -o cmTC_f5a77
make[3]: warning: Clock skew detected. Your build may be incomplete.
make[3]: Leaving directory '/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/CMakeFiles/CMakeTmp'
make[2]: warning: Clock skew detected. Your build may be incomplete.
make[2]: Leaving directory '/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/CMakeFiles/CMakeTmp'
Determining if compiler supports C++ unique_ptr failed with the following output:
Change Dir: /home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/CMakeFiles/CMakeTmp
Run Build Command(s):/usr/bin/make cmTC_02c6e/fast && make[2]: Entering directory '/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/CMakeFiles/CMakeTmp'
make[2]: Warning: File 'Makefile' has modification time 0,27 s in the future
make -f CMakeFiles/cmTC_02c6e.dir/build.make CMakeFiles/cmTC_02c6e.dir/build
make[3]: Entering directory '/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/CMakeFiles/CMakeTmp'
make[3]: Warning: File 'CMakeFiles/cmTC_02c6e.dir/flags.make' has modification time 0,26 s in the future
Building CXX object CMakeFiles/cmTC_02c6e.dir/cm_cxx_unique_ptr.cxx.o
/usr/bin/g++ -O2 -std=gnu++17 -o CMakeFiles/cmTC_02c6e.dir/cm_cxx_unique_ptr.cxx.o -c /home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/Source/Checks/cm_cxx_unique_ptr.cxx
Linking CXX executable cmTC_02c6e
/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/Bootstrap.cmk/cmake -E cmake_link_script CMakeFiles/cmTC_02c6e.dir/link.txt --verbose=1
/usr/bin/g++ -O2 -L/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/host/lib -Wl,-rpath,/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/host/lib CMakeFiles/cmTC_02c6e.dir/cm_cxx_unique_ptr.cxx.o -o cmTC_02c6e
make[3]: warning: Clock skew detected. Your build may be incomplete.
make[3]: Leaving directory '/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/CMakeFiles/CMakeTmp'
make[2]: warning: Clock skew detected. Your build may be incomplete.
make[2]: Leaving directory '/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/CMakeFiles/CMakeTmp'
I cannot figure out wath is wrong.
I thought it could be a clock skew problem but I tried also outside a virtual machine with identical results.
I also tried to compile and link by hand (using the command lines above) without any errors or warnings.
/usr/bin/g++ -O2 -std=gnu++17 -o cm_cxx_make_unique.cxx.o -c /home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/build/host-cmake-3.15.5/Source/Checks/cm_cxx_make_unique.cxx
/usr/bin/g++ -O2 -L/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/host/lib -Wl,-rpath,/home/max/Lavori/nova/srcs/repo/dep-startup/buildroot-output/buildroot-2020.02.1/output/host/lib cm_cxx_make_unique.cxx.o -o cmTC_f5a77
I also tried to run the binary without errors.
So even more 'I can not figure out what is wrong
best regards
Max