[Bug binutils/20876] objdump is not aware about the build ID method to find detached debug info

[doko at debian dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=20876

--- Comment #2 from Matthias Klose <doko at debian dot org> ---
this doesn't seem to work yet. I now get:

$ readelf -n /bin/ls | grep 'Build ID'
    Build ID: 1b1d2d0a5c825e50e07e80595427894ef0af116b

$ strace objdump --disassemble -S /bin/ls 2>&1 | grep debug
open("/bin/.build-id/1b/1d2d0a5c825e50e07e80595427894ef0af116b.debug",
O_RDONLY) = -1 ENOENT (No such file or directory)
open("/bin/.debug/.build-id/1b/1d2d0a5c825e50e07e80595427894ef0af116b.debug",
O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/debug/bin/.build-id/1b/1d2d0a5c825e50e07e80595427894ef0af116b.debug",
O_RDONLY) = -1 ENOENT (No such file or directory)
open("/bin/1d2d0a5c825e50e07e80595427894ef0af116b.debug", O_RDONLY) = -1 ENOENT
(No such file or directory)
open("/bin/.debug/1d2d0a5c825e50e07e80595427894ef0af116b.debug", O_RDONLY) = -1
ENOENT (No such file or directory)
open("/usr/lib/debug/bin/1d2d0a5c825e50e07e80595427894ef0af116b.debug",
O_RDONLY) = -1 ENOENT (No such file or directory)

the line
open("/usr/lib/debug/bin/.build-id/1b/1d2d0a5c825e50e07e80595427894ef0af116b.debug",
O_RDONLY) = -1 ENOENT (No such file or directory)

looks fine, however the dirname needs to be stripped

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