http://llvm.org/bugs/show_bug.cgi?id=14352
Bug #: 14352
Summary: -Wuninitialized on partially uninitialized value in
union
Product: clang
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
I was recently bitten by this code:
float f();
int foo() {
union {
float a;
int b;
} x = { f() };
return x.b;
}
On a 64-bit system, the int is 64-bits and the float is 32-bits, there's no
zero-initialization of the padding, and so 'x.b' has the top-half uninitialized
bits and the bottom-half initialized. I would like a -Wuninitialized warning on
this.
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