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From 2e53dd645d5348f207cec7f8595969dc566c5a55 Mon Sep 17 00:00:00 2001
From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Mon, 17 May 2010 15:56:19 +0200
Subject: [PATCH] workaround GCC PR32219
we ended up calling 0
Fixes bug #1033
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
---
libc/misc/internals/__uClibc_main.c | 15 +++++++++++++--
1 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/libc/misc/internals/__uClibc_main.c b/libc/misc/internals/__uClibc_main.c
index f9e1244..4ee4443 100644
--- a/libc/misc/internals/__uClibc_main.c
+++ b/libc/misc/internals/__uClibc_main.c
@@ -105,6 +105,17 @@ _pthread_cleanup_pop_restore(struct _pthread_cleanup_buffer *__buffer,
#endif /* !SHARED */
+/* Defeat compiler optimization which assumes function addresses are never NULL */
+static __always_inline int not_null_ptr(const void *p)
+{
+ const void *q;
+ __asm__ (""
+ : "=r" (q) /* output */
+ : "0" (p) /* input */
+ );
+ return q != 0;
+}
+
/*
* Prototypes.
*/
@@ -254,7 +265,7 @@ void __uClibc_init(void)
#ifdef __UCLIBC_HAS_LOCALE__
/* Initialize the global locale structure. */
- if (likely(_locale_init!=NULL))
+ if (likely(not_null_ptr(_locale_init)))
_locale_init();
#endif
@@ -264,7 +275,7 @@ void __uClibc_init(void)
* Thus we get a nice size savings because the stdio functions
* won't be pulled into the final static binary unless used.
*/
- if (likely(_stdio_init != NULL))
+ if (likely(not_null_ptr(_stdio_init)))
_stdio_init();
}
--
1.7.1
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