https://sourceware.org/bugzilla/show_bug.cgi?id=27155
Bug ID: 27155
Summary: objcopy --only-keep-debug should strip .debug_info
symbols
Product: binutils
Version: 2.35.1
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: mliska at suse dot cz
CC: mark at klomp dot org
Target Milestone: ---
Let's consider the following example:
$ cat foo.c
int foo(void)
{
return 123;
}
$ gcc foo.c -O2 -g -flto -shared -o libfoo.so
Note that LTO uses artificial debug info symbols for early LTO debug info.
$ readelf -s --wide libfoo.so | grep foo.c
60: 0000000000000067 0 NOTYPE LOCAL DEFAULT 25 foo.c.cf7807ca
as seen the symbol lives in .debug_info section:
$ readelf -S --wide libfoo.so | grep 25
[25] .debug_info PROGBITS 0000000000000000 003130 0000ba 00
0 0 1
Now let's create a separated debug info and strip the original library:
$ objcopy --only-keep-debug libfoo.so debug.so
$ strip --strip-debug libfoo.so
$ readelf -s --wide debug.so | grep foo.c
60: 0000000000000067 0 NOTYPE LOCAL DEFAULT 25 foo.c.cf7807ca
and now we have problem as the original libfoo.so section index 25 points to
something different:
$ readelf -S --wide libfoo.so | grep '\[25\]'
[25] .strtab STRTAB 0000000000000000 003498 000154 00
0 0 1
My suggestion would be to strip such symbols. Perf is unhappy about such
symbols as one can easily get out of sections
in the original ELF file.
Original bug report:
https://bugzilla.suse.com/show_bug.cgi?id=1180610
@Mark: Can you please help me with that?
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