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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/64163] [5 Regression] r218024 causes qt5 build failure
Date: Thu, 04 Dec 2014 19:33:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64163

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-12-04
     Ever confirmed|0                           |1

--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Markus Trippelsdorf from comment #7)
> Here is another reduced testcase. This time hopefully without and ODR issues.
> 
>  % cat qmimeglobpattern.ii
> class A
> {
> public:
>   bool deref ();
> };
> class QString;
> struct B
> {
>   A ref;
> };
> template <typename> class QList
> {
>   B d;
> public:
>   ~QList ();
>   class const_iterator
>   {
>   };
>   const_iterator constBegin ();
>   void clear ();
>   void dealloc ();
> };
> template <typename T> QList<T>::~QList ()
> {
>   if (d.ref.deref ())
>     dealloc ();
> }
> template <typename T>
> void
> QList<T>::clear ()
> {
>   QList ();
> }
> class A1 : public QList<QString>
> {
> };
> class B1
> {
> public:
>   B1 (A1);
> };
> struct F
> {
>   void addMatch (const QString &&);
>   A1 m_matchingMimeTypes;
> };
> class G
> {
>   A1 matchingGlobs (const QString &) const;
> };
> void
> F::addMatch (const QString &&)
> {
>   m_matchingMimeTypes.clear ();
> }
> A1
> G::matchingGlobs (const QString &) const
> {
>   A1 a;
>   for (B1 b (a);;)
>     ;
> }
> 
>  % cat qmimeprovider.ii
> class A
> {
> public:
>   bool deref ();
> };
> class QString;
> struct B
> {
>   A ref;
> };
> template <typename> class QList
> {
>   B d;
> public:
>   ~QList ();
>   class const_iterator
>   {
>   };
>   const_iterator constBegin ();
>   void clear ();
>   void dealloc ();
> };
> 
> class C
> {
>   QList<QString> c;
>   QList<QString>::const_iterator i;
> 
> public:
>   C (QList<QString>) : i (c.constBegin ()) {}
> };
> template <typename T> QList<T>::~QList ()
> {
>   if (d.ref.deref ())
>     dealloc ();
> }
> 
> void
> fn1 ()
> {
>   QList<QString> a;
>   C b (a);
> }
> 
>  % g++ -fuse-ld=bfd -shared -fPIC -O3 -fvisibility=hidden -std=c++0x
> qmimeglobpattern.ii qmimeprovider.ii
>  % g++ -fuse-ld=gold -shared -fPIC -O3 -fvisibility=hidden -std=c++0x
> qmimeglobpattern.ii qmimeprovider.ii
> /usr/bin/ld.gold: error: /tmp/ccRfiSrB.o: requires dynamic R_X86_64_PC32
> reloc against '_ZN5QListI7QStringED1Ev' which may overflow at runtime;
> recompile with -fPIC
> /tmp/ccRfiSrB.o:qmimeprovider.ii:function fn1(): warning: relocation refers
> to discarded section
> /tmp/ccRfiSrB.o:qmimeprovider.ii:function fn1(): warning: relocation refers
> to discarded section
> /tmp/ccRfiSrB.o:qmimeprovider.ii:function fn1(): warning: relocation refers
> to discarded section
> collect2: error: ld returned 1 exit status

This is caused by r218024.