clang11 compile failed

[RainMark]

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• I searched the issues and found no similar issues.

What happened + What you expected to happen

/Users/rain/Project/async_simple/async_simple/experimental/coroutine.h:50:10: fatal error: 'version' file not found
#include <version>
         ^~~~~~~~~
In file included from /Users/rain/Project/async_simple/async_simple/uthread/internal/thread.cc:28:
In file included from /Users/rain/Project/async_simple/async_simple/uthread/internal/thread.h:30:
In file included from /Users/rain/Project/async_simple/async_simple/Future.h:19:
In file included from /Users/rain/Project/async_simple/async_simple/Executor.h:20:
/Users/rain/Project/async_simple/async_simple/experimental/coroutine.h:50:10: fatal error: 'version' file not found
#include <version>
         ^~~~~~~~~
1 error generated.
make[2]: *** [async_simple/CMakeFiles/async_simple_static.dir/build.make:78: async_simple/CMakeFiles/async_simple_static.dir/uthread/internal/thread.cc.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:144: async_simple/CMakeFiles/async_simple_static.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

Reproduction way

use clang11 build will get the error, the #include <version> file not exist in clang11?
comment the #include <version> can compile

clang version 11.0.0
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Candidate multilib: .;@m64
Selected multilib: .;@m64

Anything else

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

[ChuanqiXu9]

is introduced in C++20. It is possible that older library doesn't support it.

[RainMark]

@ChuanqiXu9 which macro we used in the header ?

[ChuanqiXu9]

@ChuanqiXu9 which macro we used in the header ?

I want to see if __GLIBCXX__ is defined or __LIBCPP_VERSION is defined. The two macros is used to specify the stdlib we use.