[Bug c/59939] No warning on signedness changes caused by implicit conversion

pinskia at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Sat Jan 25 03:21:00 GMT 2014


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59939

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Chengnian Sun from comment #3)
> (In reply to Andrew Pinski from comment #1)
> > IIRC this was done so that code which uses macros and have conditional code
> > like:
> > 
> > MACRO1 || fn1(a, b)
> 
> Sorry, I do not understand. Can you elaborate more? Why it is related to
> macros
> and what is the rational behind this design.

Lets say 1 was really MACRO1 defined by:
#define MACRO1 0
or
#define MACRO1 1

and you have some typedefs which 

And then you use that macro below and you get the warning.



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