macports-libcxx: error: no member named 'max_align_t' in the global namespace

[ryandesign (Ryan Carsten Schmidt)]

Building spice-server failed on OS X 10.9 and earlier because of this error in macports-libcxx:

​https://build.macports.org/builders/ports-10.9_x86_64-builder/builds/261472/steps/install-port/logs/stdio

In file included from char-device.cpp:24:
In file included from /opt/local/include/libcxx/v1/list:185:
In file included from /opt/local/include/libcxx/v1/memory:667:
In file included from /opt/local/include/libcxx/v1/type_traits:417:
/opt/local/include/libcxx/v1/cstddef:53:9: error: no member named 'max_align_t' in the global namespace
using ::max_align_t;
      ~~^

As Josh said in #68444:

Explicitly specifying the std namespace here would be more correct anyway, as max_align_t in the global namespace is really a C thing not C++.

[ryandesign (Ryan Carsten Schmidt)]

I'm assuming it is a problem in macports-libcxx but it could also be a problem in spice-server.

[jmroot (Joshua Root)]

Probably just assuming the libc headers are C11 because that's how it is on the developer's machine. C++ does not guarantee max_align_t to be defined in the global namespace.