[GiNaC-list] GiNaC versus GCC 4.2 [Was: [patch] fix template template declarations...]

Sheplyakov Alexei varg at theor.jinr.ru
Thu May 11 11:20:09 CEST 2006

On Tue, May 09, 2006 at 10:57:22PM +0200, Richard B. Kreckel wrote:
> >Note that `make check' still fails with G++ 4.2.  Basically,
> >
> >ex e("-1 + 2*I", symbol());
> >
> >triggers an exception. My patch *does not* fix this error.
> > 
> This happens in check/exam_numeric.cpp (exam_numeric6), right?

Yes. There also the same error in 

Here is the simplest code which fails in the similar way (exception
due to the parser error):

#include <iostream>
#include <ginac/ginac.h>
using namespace std;
using namespace GiNaC;

int main(int argc, char** argv)
	ex e = ex("-1 + 2*I", symbol());
	cout << e << endl;
	return 0;

The error message is:
Terminate called after throwing an instance of 'std::runtime_error'
  what():  syntax error, unexpected T_EOF, expecting ']' or ',' at

> It appears like it goes away by hard-coding some similar computation
> right before the construction of base and exponent in the inner loop.  
> Heisenbugs of this sort hint at a compiler problems, in my opinion.

I'm not sure if we are talking about the same bug...

> For the record, I'm using GCC 4.2.0 20060506 (experimental).

$ dpkg -l gcc-snapshot | tail -n 1
ii  gcc-snapshot   20060508-1     A SNAPSHOT of the GNU Compiler Collection

Best regards,

All science is either physics or stamp collecting.

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