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08fda42141
C++11 supports some C99 features. However OS/2 kLIBC headers do not
support them well.
To workaround, define some feature test macros as built-in. They are
__STDC_CONSTANT_MACROS
__STDC_LIMIT_MACROS
__LONG_LONG_SUPPORTED
Especially, __LONG_LONG_SUPPORTED enables _GLIBCXX_USE_C99 feature in
libstdc++-v3, which use -std=c++98 to test C99 features in C++.
modified: gcc/config/i386/emx.h
modified: libstdc++-v3/config/os/os2/os_defines.h
(cherry picked from commit fef1630c35955e6352f9734b43d20758ce7508be)
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