On Wednesday 10 December 2008 08:57:30 Tino Keitel wrote:
> Hi,
>
> as the bug tracker is down, I try it here.
>
> I discovered that all statically linked programs without stdio usage
> segfault with uclibc 0.9.29 and later. Here is the example program I
...
> I got this segfault with uclibc 0.9.29 and gcc 4.1 first. It happens on
> i386, but not on big endian ARM. Here is the procedure how I tracked
> this down with buildroot from latest git, using uclibc 0.9.30 and gcc
> 4.3.2:
I haven't seen it in 0.9.30, but then I'm using gcc 4.1 not 4.3.
The patch I used to fix it for 0.9.29 with 4.1 is attached. (The gcc
./configure step creates a "void main(void) {}" and compiles and runs it as a
sanity test for the compiler, which segfaulted with stock uClibc 0.9.29 but
works fine for me out of the box with 0.9.30.)
Rob
From [EMAIL PROTECTED] Thu Jul 17 18:36:26 2008
I noticed in your July
13th blog entry that you've hit the uClibc static segfaulting bug. I'm
really surprised no one fixed this before because it was the first thing
I did with my first uClibc toolchain. 'int main(){return 0;}' is like
the Ur-loWorld of toolchainery, especially when one is concerned with
static-binary-byte-bloat which seems to be an obsession of uClibbers.
Anyway, that was about 4 days ago so you've probably fixed it by now,
but just in case you haven't I'm passing along my patch for it. (Not to
worry, I haven't released anything yet so there's no GPL violation, and
I'm hereby putting my patch into the public domain in case you want to
submit it to uClibc)
diff -ru uClibc-0.9.29-old/libc/misc/internals/__uClibc_main.c uClibc-0.9.29/libc/misc/internals/__uClibc_main.c
--- uClibc-0.9.29-old/libc/misc/internals/__uClibc_main.c 2007-01-11 16:39:13.000000000 -0600
+++ uClibc-0.9.29/libc/misc/internals/__uClibc_main.c 2007-09-15 07:13:18.000000000 -0500
@@ -79,13 +79,17 @@
* Prototypes.
*/
extern void weak_function _stdio_init(void) attribute_hidden;
+static void __weakstub (void) { return; }
+weak_alias (__weakstub, _stdio_init)
extern int *weak_const_function __errno_location(void);
extern int *weak_const_function __h_errno_location(void);
#ifdef __UCLIBC_HAS_LOCALE__
extern void weak_function _locale_init(void) attribute_hidden;
+weak_alias (__weakstub, _locale_init)
#endif
#ifdef __UCLIBC_HAS_THREADS__
extern void weak_function __pthread_initialize_minimal(void);
+weak_alias (__weakstub, __pthread_initialize_minimal)
#endif
/* If __UCLIBC_FORMAT_SHARED_FLAT__, all array initialisation and finalisation
@@ -198,8 +202,7 @@
* __pthread_initialize_minimal so we can use pthread_locks
* whenever they are needed.
*/
- if (likely(__pthread_initialize_minimal!=NULL))
- __pthread_initialize_minimal();
+ __pthread_initialize_minimal();
#endif
#ifndef SHARED
@@ -222,8 +225,7 @@
#ifdef __UCLIBC_HAS_LOCALE__
/* Initialize the global locale structure. */
- if (likely(_locale_init!=NULL))
- _locale_init();
+ _locale_init();
#endif
/*
@@ -232,8 +234,7 @@
* 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))
- _stdio_init();
+ _stdio_init();
}
libc_hidden_def(__uClibc_init)
diff -ru uClibc-0.9.29-old/libc/stdlib/_atexit.c uClibc-0.9.29/libc/stdlib/_atexit.c
--- uClibc-0.9.29-old/libc/stdlib/_atexit.c 2007-05-04 09:13:17.000000000 -0500
+++ uClibc-0.9.29/libc/stdlib/_atexit.c 2007-09-15 07:14:47.000000000 -0500
@@ -306,6 +306,8 @@
#ifdef L_exit
extern void weak_function _stdio_term(void) attribute_hidden;
+static void __weakstub (void) { return; }
+weak_alias (__weakstub, _stdio_term)
attribute_hidden void (*__exit_cleanup) (int) = 0;
__UCLIBC_MUTEX_INIT(__atexit_lock, PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP);
@@ -330,8 +332,7 @@
* this will attempt to commit all buffered writes. It may also
* unbuffer all writable files, or close them outright.
* Check the stdio routines for details. */
- if (_stdio_term)
- _stdio_term();
+ _stdio_term();
_exit(rv);
}
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