GCC: Explicitly set the language to C
This will solve typical case such as:
$ cat foo.C int bar() { return 42; }
$ gcc -o foo.o -c foo.C $ nm foo.o 0000000000000000 T _Z3barv U __gxx_personality_v0
Compared to:
$ gcc -x c -o foo.o -c foo.C $ nm foo.o 0000000000000000 T bar
Fixes: #14516 (closed)