* cppexp.c (cpp_classify_number): Accept '.' after "0x".

	* testsuite/gcc.dg/cpp/c99-hexfloat-3.c: New file.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@65091 138bc75d-0d04-0410-961f-82ee72b054a4