$ 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
