* gc_os_dep.c: fix various preprocessor usages of new public

symbols to expect 0 or 1 values rather than 1 or undefined.
i.e. change #ifdef to #if, etc.
(STACK_GROWS_DOWN): define to 0 or 1 rather than 1 or undef.

diff --git a/libguile/gc_os_dep.c b/libguile/gc_os_dep.c
index 4cf1f07..ec746ee 100644 (file)
--- a/libguile/gc_os_dep.c
+++ b/libguile/gc_os_dep.c
@@ -1078,7 +1078,7 @@ typedef int GC_bool;
 #       define STACKBOTTOM ((ptr_t)environ)
 #   endif
 #   ifndef SCM_STACK_GROWS_UP /* don't fight with scmconfig.h */
-#     define SCM_STACK_GROWS_UP
+#     define SCM_STACK_GROWS_UP 1
 #   endif
 #   define DYNAMIC_LOADING
 #   ifndef HPUX_THREADS
@@ -1265,9 +1265,11 @@ typedef int GC_bool;
 #   define DATASTART ((ptr_t)(&__data_start != 0? &__data_start : &data_start))
 #endif
 
-# ifndef SCM_STACK_GROWS_UP
-#   define STACK_GROWS_DOWN
-# endif
+# if SCM_STACK_GROWS_UP
+#   define STACK_GROWS_DOWN 0
+# else
+#   define STACK_GROWS_DOWN 1
+#endif
 
 # ifndef CPP_WORDSZ
 #   define CPP_WORDSZ 32
@@ -1864,7 +1866,7 @@ void *scm_get_stack_base()
        return(STACKBOTTOM);
 #   else
 #      ifdef HEURISTIC1
-#         ifdef STACK_GROWS_DOWN
+#         if STACK_GROWS_DOWN
             result = (ptr_t)((((word)(&dummy))
                               + STACKBOTTOM_ALIGNMENT_M1)
                              & ~STACKBOTTOM_ALIGNMENT_M1);
@@ -1877,7 +1879,7 @@ void *scm_get_stack_base()
           result = GC_linux_stack_base();
 #      endif
 #      ifdef HEURISTIC2
-#          ifdef STACK_GROWS_DOWN
+#          if STACK_GROWS_DOWN
                result = GC_find_limit((ptr_t)(&dummy), TRUE);
 #              ifdef HEURISTIC2_LIMIT
                    if (result > HEURISTIC2_LIMIT
@@ -1896,7 +1898,7 @@ void *scm_get_stack_base()
 #          endif
 
 #      endif /* HEURISTIC2 */
-#      ifdef STACK_GROWS_DOWN
+#      if STACK_GROWS_DOWN
            if (result == 0) result = (ptr_t)(signed_word)(-sizeof(ptr_t));
 #      endif
        return(result);