http://llvm.org/bugs/show_bug.cgi?id=11742
Bug #: 11742
Summary: c++11: constant emitter needs to zero-initialize
padding for trivially-copyable types
Product: clang
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++0x
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Padding for objects with static storage duration is currently emitted as undef.
This is non-conforming in C++11, because:
1) zero initialization is performed prior to constant initialization (unlike C)
2) zero initialization initializes padding to 0 bits (unlike C++98)
3) for trivially-copyable types, it is permissible to inspect the effective
array of unsigned char (of size sizeof(T)) comprising the object
Hence a conforming program can tell whether the padding has been
zero-initialized.
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