Hans Boehm's garbage collector now also uses __APPLE__ and __MACH__ and Apple's documentation says "To define a section of code to be compiled on Mac OS X system you should define a section using __APPLE__ with __MACH__ macros.". See http://developer.apple.com/technotes/tn2002/tn2071.html#Section10 for details.
The attached patch updates the preprocessor directives in gc_os_dep.c. The patch also separates the definition of the variable result in scm_get_stack_base() from the variable initialisation. If the definition and the initialisation are not separated GCC 3.3 complains about an unused variable on Mac OS X and HP-UX.
Index: gc_os_dep.c
===================================================================
RCS file: /cvsroot/guile/guile/guile-core/libguile/gc_os_dep.c,v
retrieving revision 1.22
diff -u -r1.22 gc_os_dep.c
--- gc_os_dep.c 13 Nov 2003 18:19:02 -0000 1.22
+++ gc_os_dep.c 24 May 2004 11:59:22 -0000
@@ -266,7 +266,8 @@
# define MACOS
# define mach_type_known
# endif
-# if defined(macosx)
+# if defined(macosx) || \
+ defined(__APPLE__) && defined(__MACH__) && defined(__ppc__)
# define MACOSX
# define POWERPC
# define mach_type_known
@@ -1878,7 +1879,9 @@
void *scm_get_stack_base()
{
word dummy;
- void *result = &dummy; /* initialize to silence compiler */
+ void *result;
+
+ result = &dummy; /* initialize to silence compiler */
# define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1)
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