Package: g++-4.3
Version: 4.3.3-10
Severity: important
When linking a shared object file from one or several object files
that use GCC's intrinsic atomic functions like
__sync_bool_compare_and_swap, __sync_sub_and_fetch,
__sync_add_and_fetch..., g++ linker driver leaves that symbols as
undefined to the library created, so later attempts to use the library
will fail. It behaves correctly when using gcc for linking,
however. Here I send a simple testcase:
debian-armel:~# cat foo.c
void doit(void **p, void *val, void *val2)
{
__sync_bool_compare_and_swap(p, val, val2);
}
debian-armel:~# gcc foo.c -c
debian-armel:~# g++ -shared foo.o -o libfoo.so
debian-armel:~# nm -D libfoo.so | grep sync
U __sync_bool_compare_and_swap_4
debian-armel:~# gcc -shared foo.o -o libfoo.so
debian-armel:~# nm -D libfoo.so | grep sync
debian-armel:~#
*Linking:
debian-armel:~# g++ -shared foo.o -o libfoo.so
debian-armel:~# cat dummymain.c
int main(){return 0;}
debian-armel:~# g++ dummymain.c libfoo.so
/usr/bin/ld: a.out: hidden symbol `__sync_bool_compare_and_swap_4' in
/usr/lib/gcc/arm-linux-gnueabi/4.3.3/libgcc.a(linux-atomic.o) is referenced by
DSO
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: ld returned 1 exit status
Thank you for your help,
Alberto
-- System Information:
Debian Release: squeeze/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: armel (armv5tejl)
Kernel: Linux 2.6.26-1-versatile
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages g++-4.3 depends on:
ii gcc-4.3 4.3.3-10 The GNU C compiler
ii gcc-4.3-base 4.3.3-10 The GNU Compiler Collection (base
ii libc6 2.9-12 GNU C Library: Shared libraries
ii libgcc1 1:4.4.0-5 GCC support library
ii libgmp3c2 2:4.2.4+dfsg-8.1 Multiprecision arithmetic library
ii libmpfr1ldbl 2.4.1-1 multiple precision floating-point
ii libstdc++6-4.3-dev 4.3.3-10 The GNU Standard C++ Library v3 (d
g++-4.3 recommends no packages.
Versions of packages g++-4.3 suggests:
pn gcc-4.3-doc <none> (no description available)
pn libstdc++6-4.3-dbg <none> (no description available)
-- no debconf information
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