Re: what is defined, was for or against equality

Thomas Koenig <tkoenig@netcologne.de> schrieb:


> [I have used Fortran systems that initialized otherwise undefined
> data to a value that would trap, to help find use-before-set errors.
> -John]


That usually is still available, but optional. An short example:


$ cat a.f90
program main
    print *,a
end program main
$ gfortran -g -ffpe-trap=invalid -finit-real=snan a.f90
$ ./a.out


Program received signal SIGFPE: Floating-point exception - erroneous arithmetic operation.


with a backtrace pointing to the offending line.


It does not necessarily work on COMMON blocks, though.

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