Hello,Johannes Brunen! I can't say anything about your trouble. But I have a trouble about ginac-1.1.7. I had tyied to insatll ginac1.1.7 using MinGW(but no MSYS) on windows XP, but I failed. You said you had build ginac1.1.7 successfully on the windows XP, Would you tell me how did you do it? I read this mail:http://www.ginac.de/lists/ginac-list/msg00410.html Did you meet this trouble ever? Thank you very much! sincerely, Boqun Cheng ======= 2004-04-05 11:34:00 You say:======

Hi,

I'm not subscribed to this list, but I have detected a problem with the new release of GiNaC, which I would like to report.

After properly building GiNaC-1.2.0 on windows XP using the MinGW / MSYS platform I got a segmentation fault on starting my demo application. This didn't happen with GiNaC-1.1.7.

After looking to the source code I found a problem with the current implementation:

In file uitils.cpp the following constants are defined: _num0_p _num0 _ex0

These are initialized on behalf of constructor library_init() which is called by statement static library_init library_initialize from file ex.h (line 53).

The constructor function_options::function_options(std::string const & n, std::string const & tn) in file function.cpp (line 56) calls function initialize() (line 67 )which has a statement symtree = 0; in its implementation (line 82).

Symtree is of type ex which is initialized by ex(int) which calls basic & ex::construct_from_int(int i) in file ex.cpp (line 329). The relevant line is case 0: return const_cast<numeric &>(_num0);

Reference counting, now, forces usage of operator-> on the _num0 object. Now, here is the problem: It may happen that the construtor of function_options() is called before the call of library_init(). function_options() is called during registration of class container by statement GINAC_DECLARE_REGISTERED_CLASS(container, basic) in file container.h (line 130).

The construction order of static objects in different translation units is undefined in C++. Therefore the problem may or may not show up.

With kind regards and a lot of respect

Johannes

==== 　　　　　　　　cbq@software.ict.ac.cn 　　　　　　　　　　2004-04-05