https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87406
Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |manu at gcc dot gnu.org
--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> We do warn about this, but only with -Wconversion which is not in -Wall or
> -Wextra
>
> c.cc:1:24: warning: conversion to ‘char’ from ‘int’ may alter its value
> [-Wconversion]
> char f(int i) { return i; }
This is not the "constant" case. A testcase would be:
char foo(void) {
return 132;
}
<source>: In function 'char square()':
<source>:3:12: warning: conversion from 'int' to 'char' changes value from
'132' to ''\37777777604'' [-Wconversion]
return 132;
^~~
I think the constant case should be safe for -Wall. It is a just a matter of
adding more specific flags.
