Ali Bahrami wrote:
On 10/20/10 09:42, "C. Bergström" wrote:
Hi
Does anyone have time to take a look at this test case..
# Example
g++ -m64 -o test test.s
~$ ./test
terminate called after throwing an instance of 'int'
Abort
There's some problem with the unwind tables, but I can't spot it..
Something is different between sol and linux that's causing this..
Thanks
./C
Original code
------------------------------
cat test.cpp
int main() {
try {
throw (int)10;
}
catch(int i) {
return i;
}
return 0;
}
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I presume that you're hitting this:
% g++ -m64 -o test test.s
ld: fatal: file /var/tmp//ccsAaORD.o: section [8].eh_frame:
section type is SHT_PROGBITS: expected SHT_AMD64_UNWIND
collect2: ld returned 1 exit status
That error is the result of the fix I did for
6931044 ld should not allow SHT_PROGBITS .eh_frame sections on amd64
in snv_137. I can get your code to compile by changing line 171 from
.section .eh_frame, "a",@progbits
to
.section .eh_frame, "a",@unwind
giving
% g++ -m64 -o test test.s
% ./test
%
g++ on solaris does not use progbits for that, so I'm puzzled as to how
this piece of assembler was created. Was it created under Linux, where
they seem to accept PROGBITS as a valid section type for unwind sections
on amd64?
I'm beginning to think the fix for 6931044 needs to be changed from
rejecting
progbits unwind sections, to quietly accepting them and treating them as
amd64_unwind. Anything you can tell me about how this code came into
being would be helpful. Thanks...
Hi Ali,
This is awesome information and helped me get to the bottom of my
problem.. When you can't step into unwind *at all* and dbx dumps core on
a trivial example it makes things pretty difficult to debug. (gdb simply
wouldn't step into the throw and I didn't try mdb)
Test server was snv_111b
If there's no standard to dictate correct behavior then issue a warning
or reject it.. The old behavior isn't good, but can't change that now
and there's no need imho to mirror Linux just for the sake of mirroring
linux..
Thanks
./C
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