https://bugs.llvm.org/show_bug.cgi?id=43647
Bug ID: 43647
Summary: no warnings with -Waddress
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
clang-10 falls to emit the warning for the following:
$ cat s.c
int main()
{
int *a = (void *) 0;
int b = (&a) == ((void *) 0);
return b;
}
$ clang-10 -Weverything -pedantic s.c
clang version 10.0.0 (https://github.com/llvm/llvm-project.git
49c4e58b75ecec8dce75dd13c61aaeb30e14b531)
Target: x86_64-unknown-linux-gnu
Thread model: posix
[-Waddress] is enabled by default in Clang, but do not issue the warning. When
compiled with GCC, warnings such as:
$ gcc -Wall s.c
s.c: In function ‘main’:
s.c:4:16: warning：the comparison will always evaluate as ‘false’ for the
address of ‘a’ will never be NULL [-Waddress]
4 | int b = (&a) == ((void *) 0);
| ^~
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