[Bug ld/29087] New: "non-canonical reference to canonical protected function" with protected visibility, -mno-direct-extern-access and virtual functions

[thiago at kde dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29087

            Bug ID: 29087
           Summary: "non-canonical reference to canonical protected
                    function" with protected visibility,
                    -mno-direct-extern-access and virtual functions
           Product: binutils
           Version: 2.38
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: thiago at kde dot org
  Target Milestone: ---

Created attachment 14078
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14078&action=edit
Testcase

Related to (possibly caused by the fix to) bug 28875.

$ cat lib.h
#ifdef BUILD
#  define LIB_API __attribute__((visibility("protected")))
#else
#  define LIB_API __attribute__((visibility("default")))
#endif
struct LIB_API S
{
    virtual ~S();
    virtual void f();
};

$ cat lib.cpp 
#define BUILD
#include "lib.h"

S::~S() { }
void S::f() { }
$ cat main.cpp 
#include "lib.h"

struct Local : S { };
int main()
{
    Local l;
}

$ gmake
g++ -shared -fPIC -mno-direct-extern-access -O2 -g -o lib.so lib.cpp
g++ -c -fPIE -mno-direct-extern-access -O2 -g main.cpp
g++ main.o lib.so
/usr/bin/ld: main.o: non-canonical reference to canonical protected function
`_ZN1S1fEv' in lib.so
/usr/bin/ld: failed to set dynamic section sizes: bad value
collect2: error: ld returned 1 exit status
gmake: *** [Makefile:5: a.out] Error 1

$ eu-readelf -r main.o | sed -n '/.data.rel.ro._ZTV5Local/,/^$/p'
Relocation section [18] '.rela.data.rel.ro._ZTV5Local' for section [17]
'.data.rel.ro._ZTV5Local' at offset 0xb58 contains 4 entries:
  Offset              Type            Value               Addend Name
  0x0000000000000008  X86_64_64       000000000000000000      +0 _ZTI5Local
  0x0000000000000010  X86_64_64       000000000000000000      +0 _ZN5LocalD1Ev
  0x0000000000000018  X86_64_64       000000000000000000      +0 _ZN5LocalD0Ev
  0x0000000000000020  X86_64_64       000000000000000000      +0 _ZN1S1fEv

$ eu-readelf --dyn-syms lib.so                                   

Symbol table [ 5] '.dynsym' contains 14 entries:
 1 local symbol  String table: [ 6] '.dynstr'
  Num:            Value   Size Type    Bind   Vis          Ndx Name
    0: 0000000000000000      0 NOTYPE  LOCAL  DEFAULT    UNDEF 
    1: 0000000000000000      0 FUNC    WEAK   DEFAULT    UNDEF
__cxa_finalize@GLIBC_2.2.5 (2)
    2: 0000000000000000      0 OBJECT  GLOBAL DEFAULT    UNDEF
_ZTVN10__cxxabiv117__class_type_infoE@CXXABI_1.3 (3)
    3: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF
_ZdlPvm@CXXABI_1.3.9 (4)
    4: 0000000000000000      0 NOTYPE  WEAK   DEFAULT    UNDEF
_ITM_deregisterTMCloneTable
    5: 0000000000000000      0 NOTYPE  WEAK   DEFAULT    UNDEF __gmon_start__
    6: 0000000000000000      0 NOTYPE  WEAK   DEFAULT    UNDEF
_ITM_registerTMCloneTable
    7: 0000000000001110      1 FUNC    GLOBAL PROTECTED     14 _ZN1SD1Ev
    8: 0000000000001110      1 FUNC    GLOBAL PROTECTED     14 _ZN1SD2Ev
    9: 0000000000001120      1 FUNC    GLOBAL PROTECTED     14 _ZN1S1fEv
   10: 0000000000001130     10 FUNC    GLOBAL PROTECTED     14 _ZN1SD0Ev
   11: 0000000000002000      3 OBJECT  WEAK   PROTECTED     16 _ZTS1S
   12: 0000000000003dd0     16 OBJECT  WEAK   PROTECTED     21 _ZTI1S
   13: 0000000000003da8     40 OBJECT  WEAK   PROTECTED     21 _ZTV1S

$ gcc -v |& tail -1
gcc version 12.0.1 20220420 (experimental) releases/gcc-11.2.0-1089-g691af15031
(Clear Linux OS for Intel Architecture) 
$ ld -v
GNU ld (GNU Binutils) 2.38

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