https://sourceware.org/bugzilla/show_bug.cgi?id=20876
Bug ID: 20876
Summary: objdump is not aware about the build ID method to find
detached debug info
Product: binutils
Version: 2.28 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: doko at debian dot org
Target Milestone: ---
[forwarded from https://bugs.debian.org/838875]
find_separate_debug_file is not aware of finding the detached debuginfo using
the Build-Id method. It looks like when this was introduced, it was only done
for gdb, not for bfd in opncls.c(find_separate_debug_file).
$ readelf -n /bin/ls | grep 'Build ID'
Build ID: 6774d0a9b81709df5c4dec5df14749c7b645ff7a
$ strace objdump --disassemble -S /bin/ls 2>&1 | grep debug
open("/bin/74d0a9b81709df5c4dec5df14749c7b645ff7a.debug", O_RDONLY) = -1 ENOENT
(No such file or directory)
open("/bin/.debug/74d0a9b81709df5c4dec5df14749c7b645ff7a.debug", O_RDONLY) = -1
ENOENT (No such file or directory)
open("/usr/lib/debug/bin/74d0a9b81709df5c4dec5df14749c7b645ff7a.debug",
O_RDONLY) = -1 ENOENT (No such file or directory)
$ dpkg -S 4d0a9b81709df5c4dec5df14749c7b645ff7a
coreutils-dbgsym:
/usr/lib/debug/.build-id/67/74d0a9b81709df5c4dec5df14749c7b645ff7a.debug
gdb documents this lookup as:
* For the "build ID" method, GDB looks in the '.build-id'
subdirectory of each one of the global debug directories for a file
named 'NN/NNNNNNNN.debug', where NN are the first 2 hex characters
of the build ID bit string, and NNNNNNNN are the rest of the bit
string. (Real build ID strings are 32 or more hex characters, not
10.)
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