Re: Serious compatibility breakage in -current.

On Dec 2, 2007 6:30 AM, Kostik Belousov <kostikbel_at_gmail.com> wrote:
> Yes, I have the similar program to. I asked somewhat different question.
> sbcl has the following code in the src/runtime/bsd-os.c:
>
>     /* Memory fault signal on FreeBSD was changed from SIGBUS to
>      * SIGSEGV. */
>     if (getosreldate() < 700004)
>         sig_memory_fault = SIGBUS;
>     else
>         sig_memory_fault = SIGSEGV;
>
> It shall broke in the way similar to the CMUCL, after I commit the patch
> to CURRENT/RELENG_7, regardless of whether I MFC crtbrand.c fix to RELENG_6.
> This is why the machdep sysctls for i386/amd64 are introduced.
>
> Are you satisfied with this ? I, even after help from Kris Kennaway,
> still unable to provide the solution that does not broke something, at
> least without manual intervention (aka sysctl).

Yes, I am still satisfied with your previous patch.  Workarounds such
as the one above solve the problem of making source code that one is
at liberty to change compatible with both FreeBSD <=6 and FreeBSD 7.
The problem I am trying to solve is how to keep binaries compatible.

Since FreeBSD 7 has not been formally released, I believe the impact
of your patch will not be significant.  There is still plenty time to
change applications that implemented a workaround for an unreleased
version of FreeBSD.  Changing old binaries is impossible.