https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86239
Bug ID: 86239
Summary: Suggestion: Improve "set but not used variable"
warning
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: pattakosn at yahoo dot com
Target Milestone: ---
Created attachment 44304
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44304&action=edit
compiled with gcc -Wall -Wextra -pedantic
Hi,
I am not sure if I am right on this, but I noticed that having code like this:
useless = 0;
useless = useless;
silences the set but not used variable warning (assume that useless is a local
variable and is not used anywhere else). Now, I would agree that the second
line is useless and a terrible thing to do, but still, wouldn't it better if
the compiler still complained about the set but not used variable (perhaps
about the useless command as well, but I do not know if it would be easy to
classify identity/"useless" commands.
I attach a very small file that I used to test the compiler warnings.
