Bootstrap error on x86-linux, fixincl segfault + fix

[Kaveh R. Ghazi]

I'm getting a segfault from stage1 fixincl today.

 > ./fixincl -v
 > make[3]: *** [install-bin] Segmentation fault (core dumped)

Here is the backtrace from gdb:

 > (gdb) where
 > #0  0x8049a47 in run_compiles ()
 >     at ../../../egcs-CVS20000511/gcc/fixinc/fixincl.c:408
 > #1  0x80494c6 in do_version ()
 >     at ../../../egcs-CVS20000511/gcc/fixinc/fixincl.c:192
 > #2  0x8049566 in initialize (argc=2, argv=0xbfffedc4)
 >     at ../../../egcs-CVS20000511/gcc/fixinc/fixincl.c:216
 > #3  0x8049333 in main (argc=2, argv=0xbfffedc4)
 >     at ../../../egcs-CVS20000511/gcc/fixinc/fixincl.c:111
 > (gdb) p pz_machine 
 > $1 = 0x0

The following patch seemed to fix it.  But its only the correct
approach if pz_machine is allowed to be null at this point.  If not,
then the bug lies elsewhere.

		--Kaveh

diff -rup orig/egcs-CVS20000511/gcc/fixinc/fixincl.c egcs-CVS20000511/gcc/fixinc/fixincl.c
--- orig/egcs-CVS20000511/gcc/fixinc/fixincl.c	Thu May 11 10:00:57 2000
+++ egcs-CVS20000511/gcc/fixinc/fixincl.c	Thu May 11 07:59:59 2000
@@ -405,7 +405,7 @@ run_compiles ()
 
   /*  Allow machine name tests to be ignored (testing, mainly) */
 
-  if ((*pz_machine == '\0') || (*pz_machine == '*'))
+  if (pz_machine && ((*pz_machine == '\0') || (*pz_machine == '*')))
     pz_machine = (char*)NULL;
 
   /* FOR every fixup, ...  */