https://llvm.org/bugs/show_bug.cgi?id=29085
Bug ID: 29085
Summary: -O2: __always_inline__ does not have effect with
visibility attribute hidden.
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: bluechristl...@163.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Consider the following test case:
[code]
class __attribute__ ((__visibility__("default"))) facet1
{
protected:
__attribute__ ((__visibility__("hidden"), __always_inline__))
explicit facet1(int __refs = 0){}
virtual ~facet1();
};
template <class _CharT >
class __attribute__ ((__visibility__("default"))) money_put
: public facet1
{
public:
__attribute__ ((__visibility__("hidden"), __always_inline__))
explicit money_put(int __refs = 0){}
protected:
__attribute__ ((__visibility__("hidden"), __always_inline__))
~money_put() {}
};
extern template class __attribute__ ((__visibility__("default")))
money_put<char>;
struct Mymon_ : public money_put<char> {
Mymon_(int refs)
: money_put<char>(refs) {}
};
struct Myimon_ : public money_put<char> {
Myimon_(int refs)
: money_put<char>(refs) {}
};
int main(int argc, char *argv[])
{
Mymon_ fac(1);
Myimon_ faci(1);
}
[/code]
when we use clang with O2, clang++ t.cpp -O2 -c
then we grep money_put destructor on the t.o
nm t.o | grep _ZN9money_putIcED2Ev
we will find it:
U _ZN9money_putIcED2Ev
However, because we have __always_inline__, it should be inlined.
If we compile it with O0, it will fine. And if we g++ with O0 / O2, it is fine
too.
One more thing, it we use Clang 3.6 with O2, everything is ok, but Clang 3.8 /
Clang 3.9 / Main trunk fails.
This case can be reproduces on Linux on Power / x86
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