[Pkg-tcltk-devel] Bug#446335: Bug#446335: tcl8.4: GCC unit-at-a-time optimization problem

[Sergei Golovan]

On 10/12/07, Johann Glaser <glaser at ict.tuwien.ac.at> wrote:
>
> We use OMNeT++ (http://www.omnetpp.org/) which itself uses TCL internally
> for the GUI. We build a class hierarchy above it which heavily utilizes
> coroutines, implemented by OMNeT++'s cCoroutine class, which itself uses
> Stig Kofoed's "Portable Coroutines"
> (http://www.akira.ruc.dk/~keld/research/COROUTINE/COROUTINE-1.0/DOC/COROUTINE_REPORT.pdf,
> section 4.2, pp.34). For my discussion with the OMNeT++ people please see
> http://www.omnetpp.org/listarchive/msg09441.php.

The discussion doesn't look very infotmative. It's not clear whether
it's a bug in your code or in Tcl code or in GCC optimization code.

>
> As a workaround we propose to change the compile scripts to use "-O2
> -fno-unit-at-a-time" as compiler flags.

I'm not a GCC expert, but building Tcl with -fno-unit-at-a-time
doesn't seem to cause any harm. All 'make test' results are identical
regardless of whether this option is present or no. So, If the other
pkg-tcltk-devel subscribers don't have objections against, I'll add
this option in the next upload.

Cheers!
-- 
Sergei Golovan