tree 2efd99cf37598044b8b3034314bc33c7c7111f1e
parent d5f1d40f2ddf9234099b331e1d90c54ece0ee88b
author William A. Kennington III <wak@google.com> 1539291308 -0700
committer William A. Kennington III <wak@google.com> 1539331427 -0700

configure: Update from c++14 to c++17

This uses the AX_CXX_COMPILE_STDCXX() instead of
AX_CXX_COMPILE_STDCXX_1{4,7}() so that the error messages we generate
make slightly more sense.

We get errors like:
configure.ac:24: error: invalid first argument `20' to AX_CXX_COMPILE_STDCXX

Instead of:
./configure: line 5132: syntax error near unexpected token `noext'
./configure: line 5132: `AX_CXX_COMPILE_STDCXX_20(noext)'

Tested:
    Builds and passes unit tests.

Change-Id: I22f71b4f83fec0507de1175ac656ce63e9acecea
Signed-off-by: William A. Kennington III <wak@google.com>