[Bug libstdc++/71133] New: msp430-elf -mlarge FTBFS in libstdc++-v3

[yselkowi at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71133

            Bug ID: 71133
           Summary: msp430-elf -mlarge FTBFS in libstdc++-v3
           Product: gcc
           Version: 6.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: yselkowi at redhat dot com
  Target Milestone: ---

Building gcc 6.1.0 with newlib 2.4.0 for target msp430-elf fails during
configure-target-libstdc++-v3 in the 'large' multilib:

checking how size_t is mangled... x
configure: error: Unknown underlying type for size_t

Where the relevant information that GLIBCXX_CHECK_SIZE_T_MANGLING doesn't know
how to handle appears to be:

#define __SIZE_TYPE__ __int20 unsigned