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$NetBSD: patch-src_alloc_c,v 1.1 2011/12/24 13:30:33 dholland Exp $
- add an empty asm() destroying memory that prevents gcc from
optimizing out __malloc_hook and friends (which leads to
SIGSEGV in temacs during build)
--- src/alloc.c~ 1994-10-24 11:37:41.000000000 +0000
+++ src/alloc.c
@@ -240,6 +240,9 @@ emacs_blocked_free (ptr)
{
BLOCK_INPUT;
__free_hook = old_free_hook;
+#ifdef __GNUC__
+ __asm __volatile("":::"memory");
+#endif
free (ptr);
__free_hook = emacs_blocked_free;
UNBLOCK_INPUT;
@@ -253,6 +256,9 @@ emacs_blocked_malloc (size)
BLOCK_INPUT;
__malloc_hook = old_malloc_hook;
+#ifdef __GNUC__
+ __asm __volatile("":::"memory");
+#endif
value = (void *) malloc (size);
__malloc_hook = emacs_blocked_malloc;
UNBLOCK_INPUT;
@@ -269,6 +275,9 @@ emacs_blocked_realloc (ptr, size)
BLOCK_INPUT;
__realloc_hook = old_realloc_hook;
+#ifdef __GNUC__
+ __asm __volatile("":::"memory");
+#endif
value = (void *) realloc (ptr, size);
__realloc_hook = emacs_blocked_realloc;
UNBLOCK_INPUT;
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