https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87585
Bug ID: 87585
Summary: Improve diagnostics message of -Woverflow
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: msebor at gcc dot gnu.org
Target Milestone: ---
As of r248431 Martin improved the warning and now I can see:
$ cat char.C
int main(int argc, char **argv)
{
char c = -160;
}
$ gcc char.C
char.C: In function ‘int main(int, char**)’:
char.C:3:13: warning: overflow in conversion from ‘int’ to ‘char’ changes value
from ‘-160’ to ‘'`'’ [-Woverflow]
char c = -160;
^~~
which is a parade of apostrophes :)
C FE does better:
gcc -x c char.C
char.C: In function ‘main’:
char.C:3:12: warning: overflow in conversion from ‘int’ to ‘char’ changes value
from ‘-160’ to ‘96’ [-Woverflow]
char c = -160;
^
And please note difference in underlined pointer. IMHO we should ideally do
what clang does:
$ clang char.C
char.C:3:12: warning: implicit conversion from 'int' to 'char' changes value
from -160 to 96 [-Wconstant-conversion]
char c = -160;
~ ^~~~
