Re: FFI:CAST segfault with gcc 3.2.2

Sam Steingold writes:
 > > * In message <m33cki5y87.fsf@xxxxxxxxxxxxxxxx>
 > > * On the subject of "Re: [clisp-list] FFI:CAST segfault with gcc 3.2.2"
 > > * Sent on 16 Apr 2003 10:11:04 -0400
 > > * I write:
 > >
 > > > * Honorable Aurelio Bignoli <a.bignoli@xxxxxxxxxxxx> writes:
 > > >
 > > > [5]>(with-c-var (p 'c-pointer *x*) (cast p '(c-ptr (c-array character 
 > > > 4))))
 > > > Segmentation fault
 > > 
 > > I do not observe this with
 > > gcc (GCC) 3.2.1 20021207 (Red Hat Linux 8.0 3.2.1-2)
 > 
 > I _do_ observe this crash with gcc 3.2.1 when compiled with -O2.
 > I do _not_ observe it when compiled with -g -O0.

I had also to add -falign-functions=4 to CFLAGS. Without it, lisp.run
prints the following error message when it is executed by make:

./lisp.run -B . -N locale -Efile UTF-8 -Eterminal UTF-8 -norc -m 750KW -x "(and 
(load \"init.lisp\") (sys::%saveinitmem) (ext::exit))"
C_CODE_ALIGNMENT is wrong. &EVAL-WHEN = 0x806abd2.
Add -falign-functions=4 to CFLAGS in the Makefile.
make: *** [interpreted.mem] Aborted

 > this is yet another instance where -O2 vs -g makes a difference.

the problem seems to be in the code generated by gcc for foreign.c,
probably for the function C_cast. I tried to compile it without "-O2
-fexpensive-optimizations" and all the other C modules with the usual
CFLAGS, and the resulting lisp.run passed the testsuite and the CAST
test. I'm currently using it.


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