[llvm-bugs] [Bug 48172] New: clang-11's invocation of <coroutine> headers via -fcoroutines flag

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48172

            Bug ID: 48172
           Summary: clang-11's invocation of <coroutine> headers via
                    -fcoroutines flag
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jerryajay01 at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Compiling a .cpp file that uses the coroutine library with the command.

clang-11 -std=c++20 -stdlib=libstdc++ main.cpp 

The error is as follows:

/usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/coroutine:295:2:
error: "the coroutine header requires -fcoroutines"
#error "the coroutine header requires -fcoroutines"


Adding the -fcoroutine flag doesn't help:

clang-11 -std=c++20 -stdlib=libstdc++ main.cpp -fcoroutines

which generates the error:

clang-11: error: unknown argument: '-fcoroutines'

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