Does g++ really need to compile main, if c++ code is involved?

[Eric Wolf]

Am 03/24/2014 08:04 AM, schrieb Kilian, Jens:
>> From: Florian Weimer [mailto:fw@deneb.enyo.de]
>> * Jens Kilian:
>>> I remember only one compiler (HP aCC) which requires compiling main()
>>> as C++.  As far as I know GCC never needed this.
>>
>> Some systems need collect2 support for initializers:
>>
>>    <http://gcc.gnu.org/onlinedocs/gccint/Collect2.html>
>
> I interpret this page to mean that GCC will always call the required __main()
> from main(), even if compiling C code.  In this case you wouldn't need to
> compile main() using g++ (not gcc).

But that's strange. With this little example:

----- test.cpp ----------

#include <iostream>

class A {
public:
     int a;
     A() { a = 5; }
     void showA() { std::cout << a << std::endl; }
};

A a;

int main(int argc, char * argv[]) {
     a.showA();
     return 0;
}

----- test.cpp ----------

and doing

g++ -static -O0 -o test test.cpp
nm test | grep main

no __main pops up.

Could be inlined though?

But there is a
__libc_start_main
symbol, maybe __main got renamed?

Yours sincerely,

Eric Wolf