Workaround 'Uninitialized variable' cppcheck errors

* extra/AmigaOS.c [GC_AMIGA_DS] (GC_register_data_segments): Initialize
myseglist outside conditional statement.
* mach_dep.c [GETCONTEXT_FPU_EXCMASK_BUG && X86_64]
(GC_with_callee_saves_pushed): Call GC_noop1(&old_fcw) (before asm
fstcw) if CPPCHECK.
* mach_dep.c [!HAVE_BUILTIN_UNWIND_INIT] (GC_with_callee_saves_pushed):
Replace regs with &regs.
* os_dep.c [!MSWIN32 && !GC_OPENBSD_THREADS && ...]
(GC_get_main_stack_base): Set result to NULL if CPPCHECK but none of
HEURISTIC* and *STACKBOTTOM defined.

1 files changed, 5 insertions, 2 deletions

diff --git a/mach_dep.c b/mach_dep.c
index 6a9bc0f0..61b5ed26 100644
--- a/mach_dep.c
+++ b/mach_dep.c
@@ -243,6 +243,9 @@ GC_INNER void GC_with_callee_saves_pushed(void (*fn)(ptr_t, void *),
           /* client application to use -lm linker option.               */
           unsigned short old_fcw;
 
+#         if defined(CPPCHECK)
+            GC_noop1((word)&old_fcw);
+#         endif
           __asm__ __volatile__ ("fstcw %0" : "=m" (*&old_fcw));
 #       else
           int except_mask = fegetexcept();
@@ -292,8 +295,8 @@ GC_INNER void GC_with_callee_saves_pushed(void (*fn)(ptr_t, void *),
         /* We're not sure whether he would like  */
         /* to be acknowledged for it or not.     */
         jmp_buf regs;
-        register word * i = (word *) regs;
-        register ptr_t lim = (ptr_t)(regs) + (sizeof regs);
+        register word * i = (word *) &regs;
+        register ptr_t lim = (ptr_t)(&regs) + (sizeof regs);
 
         /* Setjmp doesn't always clear all of the buffer.               */
         /* That tends to preserve garbage.  Clear it.                   */