https://bugs.llvm.org/show_bug.cgi?id=42292
Bug ID: 42292
Summary: -Wnull-dereference warns about pointers with
address_space attribute
Product: clang
Version: 8.0
Hardware: PC
OS: FreeBSD
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
% cat test.c
int f(void) {
return *(int __attribute__((address_space(256))) *) 0;
}
% clang80 -S test.c
test.c:2:12: warning: indirection of non-volatile null pointer will be deleted,
not trap [-Wnull-dereference]
return *(int __attribute__((address_space(256))) *) 0;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test.c:2:12: note: consider using __builtin_trap() or qualifying pointer with
'volatile'
1 warning generated.
This warning seems incorrect for pointers with address_space attribute. Clang
also doesn't delete the dereference. It correctly produces "movl %gs:0, %eax".
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