gcc/

	* c-cppbuiltin.c (builtin_define_float_constants): Add
	fp_cast parameter, pass to builtin_define_with_hex_fp_value.
	Define __FLT_HAS_DENORM__, __DBL_HAS_DENORM__, __LDBL_HAS_DENORM__.
	(builtin_define_with_hex_fp_value): Use fp_cast when building macro.
	(c_cpp_builtins): If flag_single_precision_constant then set fp_cast
	to "((double)%sL)" otherwise "%s".

gcc/testsuite/

	* gcc.dg/single-precision-constant.c: New test.

libstdc++-v3/

	* include/std/std_limits.h (struct numeric_limits):
	Use __DBL_HAS_DENORM__, __FLT_HAS_DENORM__, __LDBL_HAS_DENORM__.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@108458 138bc75d-0d04-0410-961f-82ee72b054a4