Package: libc6-dev
Version: 2.11.2-2
Severity: normal
Tags: upstream
Hi, I think this is an upstream bug, but in the glibc page says I should
report the bug to the distribution first, so here it is. See this small
test case:
$ cat test.cpp
#include <mqueue.h>
int main()
{
mq_open("/tmp/test", O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR, 0);
return 0;
}
$ g++ -D_FORTIFY_SOURCE=1 -c test.cpp # OK
$ g++ -O -D_FORTIFY_SOURCE=1 -c test.cpp # OK
$ g++ -pedantic -D_FORTIFY_SOURCE=1 -c test.cpp # OK
$ g++ -O -pedantic -D_FORTIFY_SOURCE=1 -c test.cpp # FAIL
In file included from /usr/include/mqueue.h:97,
from test.cpp:2:
/usr/include/bits/mqueue2.h: In function ‘mqd_t mq_open(const char*, int, ...)’:
/usr/include/bits/mqueue2.h:37: error: declaration of ‘mqd_t mq_open(const
char*, int, ...)’ throws different exceptions
/usr/include/bits/mqueue2.h:26: error: from previous declaration ‘mqd_t
mq_open(const char*, int, ...) throw ()’
$ g++ -O -pedantic -D_FORTIFY_SOURCE=0 -c test.cpp # OK
The problem seems to be that -O defines the macro __OPTIMIZE__=1 and I'm
using GCC >= 4.1 (Debian 4.4.4-8), then the macro __USE_FORTIFY_LEVEL is
defined to 1 in features.h (around line 301:
#if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0 \
&& __GNUC_PREREQ (4, 1) && defined __OPTIMIZE__ && __OPTIMIZE__ > 0
# if _FORTIFY_SOURCE > 1
# define __USE_FORTIFY_LEVEL 2
# else
# define __USE_FORTIFY_LEVEL 1
# endif
#else
# define __USE_FORTIFY_LEVEL 0
#endif
Finally, mqueue.h (around line 95):
/* Define some inlines helping to catch common problems. */
#if __USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline \
&& defined __va_arg_pack_len
# include <bits/mqueue2.h>
#endif
This includes bits/mqueue2.h which seems to be broken in C++, look how it's
expanded:
$ g++ -O -pedantic -D_FORTIFY_SOURCE=1 -o- -E -xc++ test.cpp | tail -n43 | cat
-n
1 # 1 "/usr/include/bits/mqueue2.h" 1 3 4
2 # 26 "/usr/include/bits/mqueue2.h" 3 4
3 extern mqd_t mq_open (__const char *__name, int __oflag, ...)
4 throw () __attribute__ ((__nonnull__ (1)));
5 extern mqd_t __mq_open_2 (__const char *__name, int __oflag)
__attribute__ ((__nonnull__ (1)));
6 extern mqd_t __mq_open_alias (__const char *__name, int __oflag, ...)
__asm__ ("" "mq_open") __attribute__ ((__nonnull__ (1)));
7
8 extern void __mq_open_wrong_number_of_args (void)
__attribute__((__error__ ("mq_open can be called either with 2 or 4
arguments")));
9
10 extern void __mq_open_missing_mode_and_attr (void)
__attribute__((__error__ ("mq_open with O_CREAT in second argument needs 4
arguments")));
11
12
13 extern __inline __attribute__ ((__always_inline__)) __attribute__
((__gnu_inline__, __artificial__)) mqd_t
14 mq_open (__const char *__name, int __oflag, ...)
15 {
16 if (__builtin_va_arg_pack_len () != 0 && __builtin_va_arg_pack_len ()
!= 2)
17 __mq_open_wrong_number_of_args ();
18
19 if (__builtin_constant_p (__oflag))
20 {
21 if ((__oflag & 0100) != 0 && __builtin_va_arg_pack_len () == 0)
22 {
23 __mq_open_missing_mode_and_attr ();
24 return __mq_open_2 (__name, __oflag);
25 }
26 return __mq_open_alias (__name, __oflag, __builtin_va_arg_pack
());
27 }
28
29 if (__builtin_va_arg_pack_len () == 0)
30 return __mq_open_2 (__name, __oflag);
31
32 return __mq_open_alias (__name, __oflag, __builtin_va_arg_pack ());
33 }
34 # 97 "/usr/include/mqueue.h" 2 3 4
35
36
37 }
38 # 2 "test.cpp" 2
39 int main()
40 {
41 mq_open("/tmp/test", 0100 | 01, 0400 | 0200, 0);
42 return 0;
43 }
In line 3 mq_open() is declared with throw(), but in the definition in
line 13/14 throw() is not specified.
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (990, 'testing'), (100, 'unstable'), (50, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.35.2 (SMP w/4 CPU cores)
Locale: LANG=es_AR.UTF-8, LC_CTYPE=es_AR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages libc6-dev depends on:
ii libc-dev-bin 2.11.2-2 Embedded GNU C Library: Developmen
ii libc6 2.11.2-2 Embedded GNU C Library: Shared lib
ii linux-libc-dev 2.6.32-20 Linux support headers for userspac
Versions of packages libc6-dev recommends:
ii gcc [c-compiler] 4:4.4.4-2 The GNU C compiler
ii gcc-4.1 [c-compiler] 4.1.2-29 The GNU C compiler
ii gcc-4.3 [c-compiler] 4.3.5-2 The GNU C compiler
ii gcc-4.4 [c-compiler] 4.4.4-8 The GNU C compiler
ii gcc-4.5 [c-compiler] 4.5.1-3 The GNU C compiler
Versions of packages libc6-dev suggests:
pn glibc-doc <none> (no description available)
ii manpages-dev 3.25-1 Manual pages about using GNU/Linux
-- no debconf information
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