novaBBS - comp.compilers - Re: what is defined, was for or against equality

Re: what is defined, was for or against equality

<22-01-051@comp.compilers>

https://www.novabbs.com/devel/article-flat.php?id=210&group=comp.compilers#210

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From: tkoe...@netcologne.de (Thomas Koenig)
Newsgroups: comp.compilers
Subject: Re: what is defined, was for or against equality
Date: Thu, 13 Jan 2022 11:17:13 -0000 (UTC)
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by: Thomas Koenig - Thu, 13 Jan 2022 11:17 UTC

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.

Subject	Author
Re: for or against equality, was Why are ambiguous grammars usually a bad idea?	Martin Ward
Re: for or against equality, was Why are ambiguous grammars usually a bad idea?	David Brown
Re: what is defined, was for or against equality	Thomas Koenig
Re: what is defined, was for or against equality	David Brown
Re: what is defined, was for or against equality	Spiros Bousbouras
Re: what is defined, was for or against equality	Thomas Koenig
Re: what is defined, was for or against equality	Spiros Bousbouras
Re: what is defined, was for or against equality	Thomas Koenig
Re: what is defined, was for or against equality	Spiros Bousbouras
Re: what is defined, was for or against equality	David Brown
Re: what is defined, was for or against equality	Thomas Koenig
Re: what is defined, was for or against equality	David Brown
Re: what is defined, was for or against equality	Kaz Kylheku
Re: what is defined, was for or against equality	gah4
Re: what is defined, was for or against equality	Thomas Koenig
Re: what is defined, was for or against equality	David Brown
Re: what is defined, was for or against equality	Thomas Koenig
Re: what is defined, was for or against equality	gah4
Re: for or against equality, was Why are ambiguous grammars usually a bad idea?	Robert Prins
Undefined behaviour, was: for or against equality	Martin Ward
Re: Undefined behaviour, was: for or against equality	Spiros Bousbouras
Re: Undefined behaviour, was: for or against equality	David Brown
Re: Undefined behaviour, was: for or against equality	Anton Ertl
Re: Undefined behaviour, was: for or against equality	David Brown
Re: Undefined behaviour, was: for or against equality	Kaz Kylheku
Re: Undefined behaviour, was: for or against equality	George Neuner

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devel / comp.compilers / Re: what is defined, was for or against equality