[PATCH Coroutines]Fix false warning message about missing return

Sun, 19 Jan 2020 20:08:13 -0800 

Hi,
The patch sets current_function_returns_value flag in templates for all 
co_return/co_yield/co_await cases, as well as for ramp function.  This
fixes false warning message for case like the added, or various cases in
cppcoro.

Bootstrap and test on X86_64, is it OK?

Thanks,
bin

gcc/cp
2020-01-20  Bin Cheng  <bin.li...@linux.alibaba.com>

        * coroutines.cc (finish_co_await_expr): Set return value flag.
        (finish_co_yield_expr, morph_fn_to_coro): Ditto.

gcc/testsuite
2020-01-20  Bin Cheng  <bin.li...@linux.alibaba.com>

        * g++.dg/coroutines/co-return-warning-1.C: New test.

Attachment: 0001-Fix-false-warning-messages-about-missing-return-in-c.patch
Description: Binary data

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