[Bug c/56086] when compiling C code with -std=gnu99 macro __STDC_UTF_16__ is defined

[rjarrett at mathworks dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56086



--- Comment #3 from Roger Jarrett <rjarrett at mathworks dot com> 2013-01-27 
16:13:48 UTC ---

The macro __STDC_UTF_16__ is being used to guard the following typedef

typedef char16_t CHAR16_T;



compiling the program  (attached program t2.c)

typedef char16_t fred;

int main() {



}



with gcc 4.7.1 or 4.7.2 results in a compilation error: gcc -std=gnu99 t2.c

t2.c:1:1: error: unknown type name 'char16_t'





However, it succeeds as expected when compiled with g++ -std=c++11 t2.c



What am I missing here ?

--Roger