[issue4753] Faster opcode dispatch on gcc

[Marc-Andre Lemburg]

Marc-Andre Lemburg <mal at egenix.com> added the comment:

On 2009-01-01 23:59, Antoine Pitrou wrote:
> Antoine Pitrou <pitrou at free.fr> added the comment:
> 
> I've updated the comments as per Alexandre's request, added support for
> SUN CC, and fixed the generation script to use the new filename.

Since the patch heavily relies on the compiler doing the right
thing (which esp. GCC often doesn't, unfortunately), I think that the
opcode dispatch code should only be enabled via a configure option.

This is safer than enabling the support unconditionally for GCC and
the SUN Pro C compiler, since it is rather likely that some GCC versions
have bugs which could render Python unusable if compiled with the
dispatching support enabled.

A configure option also has the additional benefit that you can enable
the support for compilers which support the syntax, but are not included
in the hard-coded list of compilers included in the patch.

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