https://sourceware.org/bugzilla/show_bug.cgi?id=24191
Bug ID: 24191
Summary: Gold doesn't properly process relocations to
deduplicated code
Product: binutils
Version: 2.31
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: marc at groundctl dot com
CC: ian at airs dot com
Target Milestone: ---
$ cat x.cpp
class a {
virtual void c();
};
inline void a::c(){}
$ g++ -g -c x.cpp -o x.o
$ objdump --dwarf=decodedline -r -j.debug_line x.o
x.o: file format elf64-x86-64
Contents of the .debug_line section:
CU: x.cpp:
File name Line number Starting address View
x.cpp 4 0
x.cpp 4 0x8
x.cpp 4 0xb
RELOCATION RECORDS FOR [.debug_line]:
OFFSET TYPE VALUE
000000000000002b R_X86_64_64 .text._ZN1a1cEv
$ ld.gold x.o x.o -o x.gold -lstdc++
$ objdump --dwarf=decodedline x.gold
x.gold: file format elf64-x86-64
Contents of the .debug_line section:
CU: x.cpp:
File name Line number Starting address View
x.cpp 4 0x4002c0
x.cpp 4 0x4002c8
x.cpp 4 0x4002cb
CU: x.cpp:
File name Line number Starting address View
x.cpp 4 0
x.cpp 4 0x8
x.cpp 4 0xb
$ ld.bfd x.o x.o -o x.bfd -lstdc++
ld.bfd: warning: cannot find entry symbol _start; defaulting to
0000000000401000
$ objdump --dwarf=decodedline x.bfd
x.bfd: file format elf64-x86-64
Contents of the .debug_line section:
CU: x.cpp:
File name Line number Starting address View
x.cpp 4 0x401000
x.cpp 4 0x401008
x.cpp 4 0x40100b
CU: x.cpp:
File name Line number Starting address View
x.cpp 4 0x401000
x.cpp 4 0x401008
x.cpp 4 0x40100b
It appears that gold does not process the relocation in the second instance of
x.o, and so in the final binary there are 2 debug line entries; one pointing at
the correct address and one pointing at 0. This is handled correctly by
ld.bfd. This may be related to bug 16794.
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