linuxx8664icc: Problem with rootcint when generating dictionary files for a template class which Streamer function is user-defined

From: Pierre-Luc Drouin <pldrouin_at_physics.carleton.ca>
Date: Fri, 3 Oct 2008 18:31:28 -0400

Hi,

I am trying to compile a template class with user-defined Streamer function with ROOT linuxx8664icc and it seems that rootcint is generating the wrong code.

Here is a dummy template class that allows to reproduce the problem:

#include <cstdio>
#include "Rtypes.h"

template <typename U> class Test: public TObject {
  public:
    Test(){printf("Hello World!\n");}
  private:

    ClassDef(Test,1)
};

template <typename U> void Test<U>::Streamer(TBuffer &R__b) {
}

The LinkDef file is the following:
#ifdef __CINT__

#pragma link C++ class Test<Int_t>-;

#endif

I generate the dictionary file using the following command: rootcint Test_Dict.cxx -c -I./ Test.h Test_LinkDef.h

Here is the command I use to generate the object file and the error from icc:
icc -c -o Test_Dict.o -xT -O3 -ipo -fPIC -wd1476 -I/data/data023/pldrouin/softwares/x86_64_icc/root/include -wd1572 -fPIC Test_Dict.cxx
Test_Dict.cxx(51): error: namespace "ROOT::Shadow" has no member "Test"

        R__ASSERT(sizeof(::Test<int>) == sizeof(::ROOT::Shadow::Test<int>));
        ^

Test_Dict.cxx(51): error: type name is not allowed
        R__ASSERT(sizeof(::Test<int>) == sizeof(::ROOT::Shadow::Test<int>));
        ^

Test_Dict.cxx(51): error: expected an expression
        R__ASSERT(sizeof(::Test<int>) == sizeof(::ROOT::Shadow::Test<int>));
        ^

Test_Dict.cxx(119): error: qualified name is not allowed
        typedef ::ROOT::Shadow::Test<int> ShadowClass;
                ^

Test_Dict.cxx(119): error: expected a ";"
        typedef ::ROOT::Shadow::Test<int> ShadowClass;
                                    ^

Test_Dict.cxx(120): error: identifier "ShadowClass" is undefined
        ShadowClass *sobj = (ShadowClass*)obj;
        ^

Test_Dict.cxx(120): error: identifier "sobj" is undefined
        ShadowClass *sobj = (ShadowClass*)obj;
                     ^

Test_Dict.cxx(120): error: expected an expression
        ShadowClass *sobj = (ShadowClass*)obj;
                                         ^

Test_Dict.cxx(120): error: expected a ";"
        ShadowClass *sobj = (ShadowClass*)obj;
                                          ^

compilation aborted for Test_Dict.cxx (code 2) gmake: *** [Test_Dict.o] Error 2

I am using icc 10.0 20070426. Please note that this problem does not occur with linuxx86gcc, with a non-template class or with a template class with an auto-generated Streamer function. The problem seems to be related to name mangling for the class. Here is a diff of the generated dictionary files with and without user-defined Streamer functions (removing the diff due to the implementation of the Streamer function in the dictionary file in the case where it is not user-defined): 33a34,44

 >       #if !(defined(R__ACCESS_IN_SYMBOL) || defined(R__USE_SHADOW_CLASS))
 >       typedef ::Test< int > TestlEintgR;
 >       #else
 >       class TestlEintgR  :  public ::TObject {
 >          public:
 >          //friend XX;
 >          // To force the creation of a virtual table, throw just in case.
 >          virtual ~TestlEintgR() throw() {};
 >       };
 >       #endif
 >
51c62
<       R__ASSERT(sizeof(::Test<int>) == sizeof(::ROOT::Shadow::Test<int>));
---
 >       R__ASSERT(sizeof(::Test<int>) == 

sizeof(::ROOT::Shadow::TestlEintgR));
57c68

<                   &TestlEintgR_Dictionary, isa_proxy, 1,
---
 >                   &TestlEintgR_Dictionary, isa_proxy, 0,

119c147
<       typedef ::ROOT::Shadow::Test<int> ShadowClass;
---
 >       typedef ::ROOT::Shadow::TestlEintgR ShadowClass;

527c555
<
G__tagtable_setup(G__get_linked_tagnum(&G__Test_DictLN_TestlEintgR),sizeof(Test<int>),-1,94464,(char*)NULL,G__setup_memvarTestlEintgR,G__setup_memfuncTestlEintgR);

---
 >    
G__tagtable_setup(G__get_linked_tagnum(&G__Test_DictLN_TestlEintgR),sizeof(Test<int>),-1,28928,(char*)NULL,G__setup_memvarTestlEintgR,G__setup_memfuncTestlEintgR);

Thank you!
Pierre-Luc Drouin

Received on Sat Oct 04 2008 - 00:31:37 CEST