https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80469
Bug ID: 80469
Summary: Undefined symbol for abstract class impl with
-fvisibility=hidden
Product: gcc
Version: 5.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: theubik at mail dot ru
Target Milestone: ---
Created attachment 41231
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41231&action=edit
example
When building with gcc 5.4 two libs (used option -fvisibility=hidden), first
has undefined symbol. With gcc 4.9 (4.9.3) not reproduced.
>> # uname -a
>> Linux vbox-ubuntu16 4.4.0-72-generic #93-Ubuntu SMP Fri Mar 31 14:07:41 UTC
>> 2017 x86_64 x86_64 x86_64 GNU/Linux
>> #gcc --version
>> gcc (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609
Example:
// main.cpp
#include "subimpl.h"
class XXX
{
IA* p;
public:
~XXX()
{
p->a();
}
};
XXX xxx;
// subimpl.h
#pragma once
struct IA
{
virtual void a() = 0;
};
class A : public IA
{
public:
void dothis();
void a()
{
dothis();
}
};
// subimpl.cpp
#include "subimpl.h"
void A::dothis() {}
>> # ldd -r libexperiments.so | grep undefined
>> undefined symbol: _ZN1A6dothisEv (./libexperiments.so)
