Re: " throw logic error" abort, but print no error message out

[Bernd Roesch <nospamname at web dot de>]

Hello Jonathan

On 14.11.08, you wrote:

>If exceptions are enabled
> __throw_logic_error will throw std::logic_error, otherwise it will
> call abort().

On the amigaos compiler is sjlj enabled, i see in asm debugger after
single
stepping long it call std::logic_error.but this func do nothing print.

so i simplyfy the testprogram and see std::logic_error("test\n"); does not
output anything.

I test this too on cygwin gcc 3.4 x86 compiler(on amigaos i use 4.3.2
compiler and the attached libstdc++).Its the same output(cout and assert
work ok) but std::logic_error not.

i look to find in sourcecode the place where logic_error do any action and
print out text, but i dont find a print command.
maybe you can tell me the place where logic_error do action to print, so i
can set a breakpoint on that
place and singlestep to see whats go wrong.


-----------------------the testprog ------------------------------


#include <iostream>
#include <stdexcept>

int main(int argc, char *argv[])
{

 std::cout<<"Hallo World\n";
 std::logic_error("test\n");
assert(0);

}  



 

If so assert does not work when 



> 2008/11/12 Bernd Roesch:
>> 
>> But in libstdc++v3/src/functexcept.cc
>> 
>>  void
>> __throw_logic_error(const char*)
>>  { std::abort(); }
>> 
>> this call abort and there is no string print out, because abort get no
>> Parameter as far i see.
>> 
>> How can this work ?
> 
> It works by calling abort(), as intended.
> 
> If you take another look in functexcept.cc you'll see that when
> __EXCEPTIONS is defined the following definition is used:
> 
>  void
>  __throw_logic_error(const char* __s)
>  { throw logic_error(_(__s)); }
> 
> This allows the library to call __throw_logic_error without caring
> whether the target supports exceptions, or whether they have been
> disabled with -fno-exceptions.  If exceptions are enabled
> __throw_logic_error will throw std::logic_error, otherwise it will
> call abort().
> 
> It seems that the 68k amigaos port does not support exceptions, or
> your GCC was configured without support for exceptions.
> 
> Hope that helps,
> 
> Jonathan
Regards