Hello, I am trying to compile some software that uses `std::optional`, which from reading a few sites means I need a compiler that supports "C++17" or ISO C++ 2017 standard. So I installed clang-6.0 on a clean install of ubuntu/xenial using the packages from llvm.org, but no luck. I am guessing I am using clang incorrectly or there is something wrong with my setup. In general is the easiest way at the moment to get a working Clang "C++17" dev environment running on Linxu/Ubuntu? Apologies if this is an FAQ, but searching through the archive I could not find a simple answer.
http://clang.llvm.org/cxx_status.html#cxx17 "You can use Clang in C++17 mode with the -std=c++17 option (use -std=c++1z in Clang 4 and earlier)." Test program: ```test.cpp #include <optional> int main() { std::optional<int> o1; } ``` Error I am having below. I tried with a few different flags but always with the same failure. ``` $ clang++-6.0 -std=c++17 -o test.o test.cpp test.cpp:1:10: fatal error: 'optional' file not found #include <optional> ^~~~~~~~~~ 1 error generated. ``` Clang version and linkage info. ``` $ clang++-6.0 --version clang version 6.0.1-svn334776-1~exp1~20180826122732.96 (branches/release_60) Target: x86_64-pc-linux-gnu Thread model: posix InstalledDir: /usr/bin $ ldd /usr/bin/clang++-6.0 linux-vdso.so.1 => (0x00007fff2fd42000) libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007ff503e99000) libLLVM-6.0.so.1 => /usr/lib/x86_64-linux-gnu/libLLVM-6.0.so.1 (0x00007ff500365000) libjsoncpp.so.1 => /usr/lib/x86_64-linux-gnu/libjsoncpp.so.1 (0x00007ff500134000) libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007ff4ffdb2000) libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007ff4ffaa9000) libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007ff4ff893000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007ff4ff4c9000) /lib64/ld-linux-x86-64.so.2 (0x00007ff5040b6000) libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6 (0x00007ff4ff2c1000) libedit.so.2 => /usr/lib/x86_64-linux-gnu/libedit.so.2 (0x00007ff4ff089000) libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007ff4fee6f000) libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007ff4fec6b000) libtinfo.so.5 => /lib/x86_64-linux-gnu/libtinfo.so.5 (0x00007ff4fea42000) libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007ff4fe82d000) ``` Package source: ``` # install latest clang version (currently 6.0) # https://blog.kowalczyk.info/article/k/how-to-install-latest-clang-6.0-on-ubuntu-16.04-xenial-wsl.html curl -L https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add - sudo apt-add-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-6.0 main" sudo apt-get update sudo apt-get install -y clang-6.0 ``` Thank you for any hints! Milan
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