2013-11-19  Joshua J Cogliati  <jrincayc@yahoo.com>

	PR c/53001
	Splitting out a -Wfloat-conversion from -Wconversion for
	conversions that lower floating point number precision
	or conversion from floating point numbers to integers.

gcc/c-family/

	* c-common.c (unsafe_conversion_p): Make this function
	return an enumeration with more detail.
	(conversion_warning): Use the new return type of
	unsafe_conversion_p to separately warn either about conversions
	that lower floating point number precision or about the other
	kinds of conversions.
 	* c-common.h (enum conversion_safety): New enumeration.
 	(unsafe_conversion_p): switching return type to
 	conversion_safety enumeration.
	* c.opt: Adding new warning -Wfloat-conversion and
	enabling it with -Wconversion.

gcc/

	* doc/invoke.texi: Adding documentation about
	-Wfloat-conversion.

gcc/testsuite/

	* c-c++-common/Wfloat-conversion.c: Copies relevant
	tests from c-c++-common/Wconversion-real.c,
	gcc.dg/Wconversion-real-integer.c and gcc.dg/pr35635.c into
	new testcase for conversions that are warned about by
	-Wfloat-conversion.

From-SVN: r205090