[v3] constexpr time_point additions

[Paolo Carlini]

Hi again,
> Out of curiosity, did you also try building with 
> --enable-libstdcxx-time=rt (the most complete option)? I tried now and 
> the build breaks for me while building the pch, like the below. I'm 
> not 101% sure some of those issues aren't pre-existing, but I would 
> really appreciate your help!
If I deal with the below with attached, then I get:

FAIL: 30_threads/condition_variable/members/2.cc (test for excess errors)
WARNING: 30_threads/condition_variable/members/2.cc compilation failed 
to produce executable
FAIL: 30_threads/condition_variable_any/members/2.cc (test for excess 
errors)
WARNING: 30_threads/condition_variable_any/members/2.cc compilation 
failed to produce executable

because:

.../libstdc++-v3/testsuite/30_threads/condition_variable_any/members/2.cc:66: 
undefined reference to `std::chrono::steady_clock::now()'
/tmp/ccOE1426.o: In function `wait_until<std::chrono::steady_clock, 
std::chrono::duration<long int, std::ratio<1l, 1000000000l> > >':

Paolo.


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