Reference Number :  U66234


Version :  11.0


Operating System : 

Linux

Problem Description :
 
The Intel C++ compiler does not seem to work for no inline attribute. We get undefined symbol error during linking. The following is test case:

$ cat foo.hpp

template<class T>
class foo
{
public:
void mem();
};


$ cat foo.cpp
#include "foo.hpp"


template<class T> __attribute__((noinline))
void foo<T>::mem()
{

}

__attribute__((noinline))
void instantiatehelper()
{
foo<int> f;
f.mem();
}

]$ cat main.cpp
#include <iostream>
#include "foo.hpp"

int main()
{
foo<int> f;
f.mem();
std::cout << "main" << std::endl;
return 0;
}

$ icc main.cpp foo.cpp
/tmp/iccc84zBg.o: In function `main':
main.cpp:(.text+0x2e): undefined reference to `foo<int>::mem()'


Resolution Status : 

The problem appears to be that the Intel compiler is ignoring the attribute if it is only on the definition.

If you put the attribute on the declaration then the example links as expected ,i.e.:
template<class T>
class foo
{
public:
__attribute__((noinline)) void mem();
};







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