[Bug 3126] [IcedTea8] pax-mark-vm script calls "exit -1" which is invalid in dash

[bugzilla-daemon at icedtea.classpath.org]

http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=3126

--- Comment #6 from Andrew John Hughes <gnu.andrew at redhat.com> ---
(In reply to James Le Cuirot from comment #5)
> (In reply to Andrew John Hughes from comment #3)
> > I'm just saying that fixing this is just one issue in getting dash to work
> > with IcedTea and there are probably more Bash assumptions in the configure
> > script.
> 
> It otherwise seems to work as I have seen this error from Gentoo users who
> have selected dash and gone on to build it successfully.
> 

https://bugs.gentoo.org/show_bug.cgi?id=526200

Fixing it completely is more involved. That's against 2.x so the failing target
doesn't exist. I guess those who've built it have just been lucky in that any
configure failures haven't broken the build, but that doesn't imply it's
working correctly with dash.

> > Is this not itself a bug in dash? Why doesn't it support negative values?
> 
> Because negative values are not really valid, even in bash. ;)
> 
> $ bash -c 'exit -1'; echo $?
> 255
> $ bash -c 'exit -2'; echo $?
> 254

Ah, POSIX says:

"The exit utility shall cause the shell to exit with the exit status specified
by the unsigned decimal integer n.  If n is specified, but its value is not
between 0 and 255 inclusively, the  exit  status  is  undefined."

bash is wrapping the signed integer to an unsigned one (i.e. 0 - 1 wraps to
255).

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