http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55041
--- Comment #12 from Tom Tromey <tromey at gcc dot gnu.org> 2012-11-16 20:46:33
UTC ---
(In reply to comment #11)
> Tom, do you have any idea what's going on in comment 6 and comment 8 of this
> bug?
Not offhand.
If you send me the failing executable(s) I can take a look at their
debuginfo. Maybe that will be useful.
I don't think gdb 7.3 really works with trunk after this patch, though:
commit 2dd133d84c8991217864523ea79d11f1885f1388
Author: mark <mark@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon Aug 20 20:27:46 2012 +0000
dwarf2out.c: For DWARF 4+, output DW_AT_high_pc as constant offset.
This required a gdb change.
Another thing to try is turning on complaints before running the program
in gdb:
(gdb) set complaints 10000
(gdb) start
For me this prints tons of junk, some of which could actually be gcc
bugs:
DW_AT_low_pc 0x0 is zero for DIE at 0xf055a [in module
/home/tromey/Space/Trunk/Git/build/x86_64-unknown-linux-gnu/./libstdc++-v3/src/.libs/libstdc++.so.6]...
debug_line address at offset 0x449b7 is 0 [in module
/home/tromey/Space/Trunk/Git/build/x86_64-unknown-linux-gnu/./libstdc++-v3/src/.libs/libstdc++.so.6]
It's hard to say without debugging further, this is just a first glance.
I'm not sure if these could cause the problems you're seeing.
FWIW, the tests mostly work for me, except:
UNSUPPORTED: libstdc++-prettyprinters/shared_ptr.cc
In my case the issue seems to be weird debuginfo emitted by gcc;
look at what the breakpoint reports:
Breakpoint 1, _GLOBAL__sub_I__Z4makem () at
/home/tromey/Space/Trunk/Git/gcc/lib
stdc++-v3/testsuite/libstdc++-prettyprinters/shared_ptr.cc:81
Setting it by hand with "gdb shared_ptr.exe" then "break 72":
(gdb) b 72
Breakpoint 1 at 0x400deb:
/home/tromey/Space/Trunk/Git/gcc/libstdc++-v3/testsuite/libstdc++-prettyprinters/shared_ptr.cc:72.
(3 locations)
(gdb) info b
Num Type Disp Enb Address What
1 breakpoint keep y <MULTIPLE>
1.1 y 0x0000000000400deb in main()
at
/home/tromey/Space/Trunk/Git/gcc/libstdc++-v3/testsuite/libstdc++-prettyprinters/shared_ptr.cc:72
1.2 y 0x0000000000400ec0 in
_GLOBAL__sub_I__Z4makem()
at
/home/tromey/Space/Trunk/Git/gcc/libstdc++-v3/testsuite/libstdc++-prettyprinters/shared_ptr.cc:72
1.3 y 0x0000000000401070 in
std::_Sp_counted_deleter<int*, deleter, std::allocator<int>,
(__gnu_cxx::_Lock_policy)2>::_M_get_deleter(std::type_info const&)
at
/home/tromey/Space/Trunk/Git/gcc/libstdc++-v3/testsuite/libstdc++-prettyprinters/shared_ptr.cc:72
... very weird, looks like a gcc bug to me.
