http://llvm.org/bugs/show_bug.cgi?id=12758
Bug #: 12758
Summary: miscompilation of calls to __attribute__((pure))
virtual functions
Product: clang
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Consider this code:
struct B { virtual void f() __attribute__((pure)); };
struct D : B { void f(); };
void f(B *p) { p->f(); }
void g() { D b; f(&b); }
Here, B::f() is __attribute__((pure)), but D::f() is not. g++ emits a virtual
call within ::f(), but Clang does not. Likewise, g++ emits a call to D::f()
within ::g(), but Clang does not.
The GCC docs don't explicitly state what should happen here, but they do say
that 'pure' is a property of the function itself, which suggests that g++ is
right and clang is wrong.
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