[Bug c/53001] -Wfloat-conversion should be available to warn about floating point errors

[jjcogliati-r1 at yahoo dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53001

--- Comment #11 from Joshua Cogliati <jjcogliati-r1 at yahoo dot com> ---
Created attachment 30873
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30873&action=edit
Patch to add -Wfloat-conversion option

This version also is enabled with -Wextra.  

$ gcc -o float_test float_test.c
$ gcc -Wfloat-conversion -o float_test float_test.c
float_test.c: In function ‘main’:
float_test.c:2:3: warning: conversion to ‘int’ alters ‘double’ constant value
[-Wfloat-conversion]
   int i = 3.14;
   ^
float_test.c: In function ‘foo’:
float_test.c:8:3: warning: conversion to ‘int’ from ‘double’ may alter its
value [-Wfloat-conversion]
   return x;
   ^
float_test.c: In function ‘foo2’:
float_test.c:12:3: warning: conversion to ‘float’ from ‘double’ may alter its
value [-Wfloat-conversion]
   return x;
   ^
$ gcc -Wconversion -o float_test float_test.c
float_test.c: In function ‘main’:
float_test.c:2:3: warning: conversion to ‘int’ alters ‘double’ constant value
[-Wfloat-conversion]
   int i = 3.14;
   ^
float_test.c: In function ‘foo’:
float_test.c:8:3: warning: conversion to ‘int’ from ‘double’ may alter its
value [-Wfloat-conversion]
   return x;
   ^
float_test.c: In function ‘foo2’:
float_test.c:12:3: warning: conversion to ‘float’ from ‘double’ may alter its
value [-Wfloat-conversion]
   return x;
   ^
$ gcc -Wextra -o float_test float_test.c
float_test.c: In function ‘main’:
float_test.c:2:3: warning: conversion to ‘int’ alters ‘double’ constant value
[-Wfloat-conversion]
   int i = 3.14;
   ^
float_test.c: In function ‘foo’:
float_test.c:8:3: warning: conversion to ‘int’ from ‘double’ may alter its
value [-Wfloat-conversion]
   return x;
   ^
float_test.c: In function ‘foo2’:
float_test.c:12:3: warning: conversion to ‘float’ from ‘double’ may alter its
value [-Wfloat-conversion]
   return x;
   ^