Package: g++-4.4
Version: 4.4.5-10
Severity: normal
Hi,
I ran into this porting some existing code to armel, but a minimal example
follows. Shown here using a cross compiler, but I've confirmed that it can
be reproduced on native armel with both gcc-4.4 from squeeze and gcc-4.5
from experimental (4.5.2-1).
$ cat Makefile
out: b.o c.o
$(CXX) $^ -o d
$ cat a.h
template <typename T> struct A { T a; virtual ~A() {} };
template struct A<int>;
$ cat b.cpp
#include "a.h"
void use_A() { A<int> b; }
$ cat c.cpp
#include "a.h"
int main() { A<int> c; return 0; }
$ make CXX=arm-linux-gnueabi-g++
arm-linux-gnueabi-g++ -c -o b.o b.cpp
arm-linux-gnueabi-g++ -c -o c.o c.cpp
arm-linux-gnueabi-g++ b.o c.o -o d
c.o:(.rodata+0x0): multiple definition of `typeinfo for A<int>'
b.o:(.rodata+0x0): first defined here
c.o:(.rodata+0x8): multiple definition of `typeinfo name for A<int>'
b.o:(.rodata+0x8): first defined here
collect2: ld returned 1 exit status
This works fine on amd64 though. The interesting difference seems to be
that amd64 produces:
0000000000000000 V _ZTI1AIiE
0000000000000000 V _ZTS1AIiE
0000000000000000 V _ZTV1AIiE
While armel gives us:
00000000 R _ZTI1AIiE
00000008 R _ZTS1AIiE
00000000 V _ZTV1AIiE
If the template is left to be implicitly instantiated, then armel also
produces weak symbols for the typeinfo (but that causes other trouble
in the original example).
I found some hints of an earlier report upstream here:
http://gcc.gnu.org/ml/gcc-help/2010-02/msg00361.html
http://gcc.gnu.org/ml/gcc-help/2010-03/msg00007.html
But that didn't seem to end with any real conclusion as to what the
original problem was, which I think this example does demonstrate now.
Cheers,
Ron
-- System Information:
Debian Release: squeeze/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages g++-4.4 depends on:
ii gcc-4.4 4.4.5-10 The GNU C compiler
ii gcc-4.4-base 4.4.5-10 The GNU Compiler Collection (base
ii libc6 2.11.2-7 Embedded GNU C Library: Shared lib
ii libgmp3c2 2:4.3.2+dfsg-1 Multiprecision arithmetic library
ii libmpfr4 3.0.0-2 multiple precision floating-point
ii libstdc++6-4.4-dev 4.4.5-10 The GNU Standard C++ Library v3 (d
g++-4.4 recommends no packages.
Versions of packages g++-4.4 suggests:
pn g++-4.4-multilib <none> (no description available)
ii gcc-4.4-doc 4.4.4.nf1-1 documentation for the GNU compiler
pn libstdc++6-4.4-dbg <none> (no description available)
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