[Bug c++/44282] New: GCC allows for function overloading with pointer to function as parameter based on calling convention but assembler complains

[Bug c++/44282] New: GCC allows for function overloading with pointer to function as parameter based on calling convention but assembler complains

[vadim dot atlygin at gmail dot com]

When you have function that gets pointer to a function as parameter, it is
possible to overload it based on calling convention of parameter function. But
apparently compiler generate the same signature anyway and assembler complains
about redefinition.

$ g++ test.cpp
/tmp/ccgIM8Ir.s: Assembler messages:
/tmp/ccgIM8Ir.s:103: Error: symbol `_Z1pIvEvPFT_vE' is already defined


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           Summary: GCC allows for function overloading with pointer to
                    function as parameter based on calling convention but
                    assembler complains
           Product: gcc
           Version: 4.4.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: vadim dot atlygin at gmail dot com
 GCC build triplet: i486-linux-gnu
  GCC host triplet: i486-linux-gnu
GCC target triplet: i486-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44282

[Bug c++/44282] GCC allows for function overloading with pointer to function as parameter based on calling convention but assembler complains

[vadim dot atlygin at gmail dot com]

------- Comment #1 from vadim dot atlygin at gmail dot com  2010-05-26 12:59 -------
Created an attachment (id=20751)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20751&action=view)
isolated test case


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44282

[Bug c++/44282] GCC allows for function overloading with pointer to function as parameter based on calling convention but assembler complains

[pluto at agmk dot net]

------- Comment #2 from pluto at agmk dot net  2010-05-26 17:30 -------
on gcc-4.5 we get this:

$ g++ -Wall test.cpp 
test.cpp:9:43: warning: 'fastcall' attribute ignored
test.cpp:18:45: warning: 'fastcall' attribute ignored
test.cpp:18:46: error: redefinition of 'template<class T> void p(T (*)())'
test.cpp:13:20: error: 'template<class T> void p(T (*)())' previously declared
here


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44282

[Bug c++/44282] GCC allows for function overloading with pointer to function as parameter based on calling convention but assembler complains

[vadim dot atlygin at gmail dot com]

------- Comment #3 from vadim dot atlygin at gmail dot com  2010-05-26 17:43 -------
Might be 32/64 bit difference as 64 bit platforms have only one calling
convention.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44282

[Bug c++/44282] fastcall is not mangled at all

[pinskia at gcc dot gnu dot org]

------- Comment #4 from pinskia at gcc dot gnu dot org  2010-07-24 23:17 -------
Confirmed.


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pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |assemble-failure
      Known to fail|                            |4.1.2 4.3.2 4.2.2 4.6.0
   Last reconfirmed|0000-00-00 00:00:00         |2010-07-24 23:17:30
               date|                            |
            Summary|GCC allows for function     |fastcall is not mangled at
                   |overloading with pointer to |all
                   |function as parameter based |
                   |on calling convention but   |
                   |assembler complains         |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44282