Re: Problems with egcs on Unixware 7 system

[Robert Lipe <robertlipe at usa dot net>]

This failure form has been present in EGCS for a while.  Your test
case fails on both of the SCO ELF targets that I have ready access to.
(OpenServer 5 and UDK, which is essentially the Unixware 7 SDK) Only
a small percentage of the testsuite fails in this way.  Something in
the .weak handling seems to have gone wrong.  I haven't yet been able
to figure out if it is an EGCS thing, an assembler thing, a linker
thing, or some interaction amongst all of them.  From the reports in the
testsuite list, I suspect that many systems populated with non-GNU tools
may be affected.

It's been on my TODO list to build a Linux .S file from one of these
test cases and start smooshing it into the SCO environment, then
replacing various SCO components with GNU equivalents to see if I can
find the exact reason we don't see this on Linux.  I just haven't made
it that far and am unlikely to do so for a few weeks.

I suspect that the thing that isn't going right is this generated assembly:

        .size    __malloc_alloc_template<0>::deallocate(void *, unsigned int),.-
__malloc_alloc_template<0>::deallocate(void *, unsigned int)                   
        .align 4
        .weak   basic_string<char, string_char_traits<char>, __default_alloc_tem
plate<false, 0> >::rep(void) const                                             
        .type    basic_string<char, string_char_traits<char>, __default_alloc_te
mplate<false, 0> >::rep(void) const,@function                                  
basic_string<char, string_char_traits<char>, __default_alloc_template<false, 0>
>::rep(void) const:
.LFB34:
        pushl %ebp


I don't at all understand this, becuase if you look at the .o, it looks
like all the template functions (nm t.o | c++filt | grep 'template') are
indeed weak.






> // test.cxx
> #include <iostream>
> #include <string>
> 
> int main(void)
> {
>      cout << "Hello\n";
> 
>      string s = "World\n";
> 
>      cout << s;
> }                 
> 
> gives the following error:
> 
> g++ test.cxx -o test
> 
> UX:ld: ERROR: /usr/local/egcs111new/lib/libstdc++.a(cstrmain.o): fatal
> error: symbol `basic_string<char, string_char_traits<char>,
> __default_alloc_template<0, 0> >::rep(void) const` multiply-defined, also in
> file /usr/tmp/ccNqGaRz.o
> collect2: ld returned 1 exit status


> I'm wondering if there is anyone out there with experience of using egcs of
> Unixware 7 who may be able to help. I've searched the egcs web site and

It works pretty well - in fact, this failure hasn't always happened.

RJL