https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110761
Bug ID: 110761
Summary: No warning for an uninitialized variable when used
within its own initialization
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: jwzeng at nuaa dot edu.cn
Target Milestone: ---
Link to the Compiler Explorer: https://godbolt.org/z/ra7P3EcMn
There is no warning for a variable is uninitialized when used within its own
initialization.
$ cat test.c
int main(void)
{
int a = 1, b = 2;
int g = (a % ((~0) && b)) && g;
}
$ gcc-trunk -Wall -Wextra -pedantic -c test.c
$
$ clang-16.0.0 -Weverything -pedantic -c test.c
test.c:4:34: warning: variable 'g' is uninitialized when used within its own
initialization [-Wuninitialized]
int g = (a % ((~0) && b)) && g;
~ ^
1 warning generated.
$
$ gcc-trunk -v
gcc (GCC) 14.0.0 20230619 (experimental) [master r14-1917-gf8e0270272]
$ clang-16.0.0 -v
clang version 16.0.0
Target: x86_64-unknown-linux-gnu
Would it be better to output warning information like clang? In gcc-11.4 and
earlier versions, there will be corresponding warnings.
