[Pkg-tcltk-devel] Bug#617628: tcl8.5: Tcl/Tk applications on powerpc crash on startup with out of stack space message

[miguel sofer]

I do not see a previous Tcl tracker item for this, so opening #3205320 
at 
https://sourceforge.net/tracker/index.php?func=detail&aid=3205320&group_id=10894&atid=110894#

On 03/09/2011 11:47 PM, Paul Mackerras wrote:
> Subject: tcl8.5: Tcl/Tk applications on powerpc crash on startup with out of stack space message
> Package: tcl8.5
> Version: 8.5.9-2
> Justification: renders package unusable
> Severity: grave
> Tags: upstream
>
> *** Please type your report below this line ***
>
> The tcl libraries now end up being built with -DTCL_STACK_GROWS_UP=1
> on the cc command line, which causes the check for stack overflow to
> have the wrong polarity.  Consequently, every Tcl and Tcl/Tk application
> exits immediately on startup with a message about being out of stack
> space.
>
> The configure test that causes this flag to be set works by running
> a small program that looks like this:
>
>          int StackGrowsUp(int *parent) {
>              int here;
>              return (&here<  parent);
>          }
>          int main (int argc, char *argv[]) {
>              int foo;
>              return StackGrowsUp(&foo);
>          }
>
> What happens is that gcc now inlines the StackGrowsUp function, meaning
> that the result of the program depends only on how gcc's algorithm for
> assigning stack slots for local variables happens to lay out the stack.
> On powerpc with gcc-4.5.2 (Debian version 4:4.5.2-1), gcc allocates
> `here' above `foo', which makes it look like the stack grows up when
> in fact it grows down.
>
> This could happen on any architecture where gcc automatically inlines
> functions.  It so happens that it doesn't on x86 at the moment and does
> on powerpc.
>
> -- System Information:
> Debian Release: wheezy/sid
>    APT prefers unstable
>    APT policy: (990, 'unstable')
> Architecture: powerpc (ppc64)
>
> Kernel: Linux 2.6.36-rc4+ (SMP w/4 CPU cores)
> Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/bash
>
> Versions of packages tcl8.5 depends on:
> ii  libc6                         2.11.2-11  Embedded GNU C Library: Shared lib
>
> tcl8.5 recommends no packages.
>
> Versions of packages tcl8.5 suggests:
> ii  tclreadline                   2.1.0-10   GNU Readline Extension for Tcl/Tk
>
> -- no debconf information
>
>
>
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