[Bug lto/43377] New: lto decreases stacktrace readability (debuginfo pubnames).

["pluto at agmk dot net" <gcc-bugzilla at gcc dot gnu dot org>]

$ make clean all
rm -f *.o *.s *.ii m
g++45 -Wall -g2 -O1  a.cpp -c
g++45 -Wall -g2 -O1  m.cpp -c
g++45 -Wall -g2 -O1  a.o m.o -o m --save-temps -fverbose-asm

$ readelf --debug-dump=pubnames ./m
(...)

    Offset      Name
    8e7         Y::foo                 <==
    913         X::foo                 <==
    968         X::~X
    98f         Y::~Y
    9b6         Y::~Y
    9fe         X::~X
    a3a         X::X
    a61         X::bar

(gdb) break Y::foo()
Breakpoint 1 at 0x400768: file a.cpp, line 25.

(gdb) bt
#0  Y::foo (this=0x7fffffffe1c0) at a.cpp:26
    ^^^^^^ readable location with namespace/class prefix.


now the same with -flto.

$ make clean all LTOFLAGS=-flto
rm -f *.o *.s *.ii m
g++45 -Wall -g2 -O1 -flto a.cpp -c
g++45 -Wall -g2 -O1 -flto m.cpp -c
g++45 -Wall -g2 -O1 -flto a.o m.o -o m --save-temps -fverbose-asm

    Offset      Name
    87          foo                  <==
    ca          foo                  <==
    10d         __base_dtor
    12c         __base_dtor
    14b         __deleting_dtor
    183         __deleting_dtor
    1a2         __base_ctor
    1c1         bar
    1f5         main

(gdb) b Y::foo()
Breakpoint 1 at 0x400768: file a.cpp, line 24.

(gdb) bt
#0  foo (this=0x7fffffffe1c0) at a.cpp:26
    ^^^ some cryptic foo.


-- 
           Summary: lto decreases stacktrace readability (debuginfo
                    pubnames).
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pluto at agmk dot net
 GCC build triplet: x86_64-gnu-linux
  GCC host triplet: x86_64-gnu-linux
GCC target triplet: x86_64-gnu-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43377