c++ - macOS Clang C++17 filesystem header not found -


i need write program using (experimental) c++17 filesystem library clang on mac (macos 10.12.03) doesn't seem have filesystem header included.

since i'm required use c++17, cannot use alternatives boost library.

when try compile sample program includes filesystem , iostream (and writes cout)

#include <filesystem> #include <iostream> using namespace std;  int main(){     cout << "test" << endl; }

i following error message:

>clang test.cpp -std=c++1z  test.cpp:2:10: fatal error: 'filesystem' file not found #include <filesystem>          ^ 1 error generated.

when try same using gcc 6.3 (installed via homebrew) get:

>gcc-6 test.cpp  -std=c++17  test.cpp:2:22: fatal error: filesystem: no such file or directory  #include <filesystem>                       ^ compilation terminated.

i tried using experimental/filesystem instead compiles using gcc seems try compile ios leading error seems related iostream

undefined symbols architecture x86_64:   "std::ios_base::init::init()", referenced from:       __static_initialization_and_destruction_0(int, int) in ccd5qivt.o   "std::ios_base::init::~init()", referenced from:       __static_initialization_and_destruction_0(int, int) in ccd5qivt.o ld: symbol(s) not found architecture x86_64 collect2: error: ld returned 1 exit status

the version of clang is:

>clang --version apple llvm version 8.0.0 (clang-800.0.42.1) target: x86_64-apple-darwin16.4.0 thread model: posix installeddir: /applications/xcode.app/contents/developer/toolchains/xcodedefault.xctoolchain/usr/bin

i'm grateful helpful input since couldn't find solved problem far (although might have been searching wrong terms).

if need more information i'll gladly provide hope have included everything.

libc++, c++ standard library on os x, has not moved <experimental/filesystem> <filesystem> yet because specification not stable.

hopefully <filesystem> part of clang 6.0 release. (edit: missed 5.0)


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