From: nobu.nokada@...
Date: 2002-09-13T11:07:54+09:00
Subject: Re: Frame-pointer omission and ruby (was Bug in Ruby Ext to C or it is me ?)

Hi,

At Thu, 12 Sep 2002 22:14:25 +0900,
Lorien Dunn wrote:
> 	Everytime i've tried to build ruby with "-O3 -mcpu=i586
> -march=k6 -ffast-math -fomit-frame-pointer" with gcc-2.95.2,
> gcc-2.95.3, gcc-3.01, and gcc-3.1, miniruby has crashed
> during the building of the default extensions. All I have to
> do to make it work is take out the "-fomit-frame-pointer".

Some versions of gcc have a bug that wrong code is emitted for
__builtin_frame_address() with -fomit-frame-pointer.

And, sorry that I forgot that I've applied this patch.

Or a patch in [ruby-dev:17947] may help.


Index: configure.in
===================================================================
RCS file: /cvs/ruby/src/ruby/configure.in,v
retrieving revision 1.139
diff -u -2 -p -r1.139 configure.in
--- configure.in	8 Sep 2002 09:04:15 -0000	1.139
+++ configure.in	8 Sep 2002 12:56:58 -0000
@@ -306,4 +306,16 @@ AC_STRUCT_ST_BLOCKS
 AC_STRUCT_ST_RDEV
 
+AC_CACHE_CHECK(for stack end address, rb_cv_stack_end_address,
+[rb_cv_stack_end_address=no
+for addr in __libc_stack_end _SEND; do
+  AC_TRY_LINK(
+    [extern void *$addr;],
+    [if (!$addr) return 1;],
+    [rb_cv_stack_end_address="$addr"; break])
+done])
+if test $rb_cv_stack_end_address != no; then
+  AC_DEFINE_UNQUOTED(STACK_END_ADDRESS, $rb_cv_stack_end_address)
+fi
+
 dnl Checks for library functions.
 AC_TYPE_GETGROUPS
Index: gc.c
===================================================================
RCS file: /cvs/ruby/src/ruby/gc.c,v
retrieving revision 1.103
diff -u -2 -p -r1.103 gc.c
--- gc.c	6 Sep 2002 08:59:38 -0000	1.103
+++ gc.c	6 Sep 2002 15:42:59 -0000
@@ -31,4 +31,8 @@
 #endif
 
+#if defined _WIN32 || defined __CYGWIN__
+#include <windows.h>
+#endif
+
 void re_free_registers _((struct re_registers*));
 void rb_io_fptr_finalize _((struct OpenFile*));
@@ -1195,7 +1199,13 @@ Init_stack(addr)
     VALUE *addr;
 {
-#if defined(__human68k__)
-    extern void *_SEND;
-    rb_gc_stack_start = _SEND;
+#if defined(_WIN32) || defined(__CYGWIN__)
+    MEMORY_BASIC_INFORMATION m;
+    memset(&m, 0, sizeof(m));
+    VirtualQuery(&m, &m, sizeof(m));
+    /* assume stack growing downward */
+    rb_gc_stack_start = (VALUE *)((char *)m.BaseAddress + m.RegionSize) - 1;
+#elif defined(STACK_END_ADDRESS)
+    extern void *STACK_END_ADDRESS;
+    rb_gc_stack_start = STACK_END_ADDRESS;
 #else
     VALUE start;


-- 
Nobu Nakada