Package: debhelper
Version: 12.2.3
Severity: normal
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Hash: SHA256
Hi,
After setting "debhelper-compat (= 12)" on golang-golang-x-tools,
I encountered the following error which aborted the package build:
dwz: Too few files for multifile optimization
objcopy:
'debian/golang-golang-x-tools/usr/lib/debug/.dwz/x86_64-linux-gnu/golang-golang-x-tools.debug':
No such file
dh_dwz: objcopy --compress-debug-sections
debian/golang-golang-x-tools/usr/lib/debug/.dwz/x86_64-linux-gnu/golang-golang-x-tools.debug
returned exit code 1
Perplexed by this error, I removed the '-q' option from the dwz
in my local /usr/bin/dh_dwz, and saw warning messages like this:
dwz: debian/golang-golang-x-tools/usr/bin/authtest: .debug_info section not
present
dwz: debian/golang-golang-x-tools/usr/bin/benchcmp: .debug_info section not
present
dwz: debian/golang-golang-x-tools/usr/bin/callgraph: .debug_info section
not present
...
dwz: debian/golang-golang-x-tools/usr/bin/vet: .debug_info section not
present
It turns out that these Go compiled ELF executables have .zdebug_info
rather than .debug_info section, i.e., "DWARF sections are now compressed
by default" as stated in the Go 1.11 Release Notes at
https://golang.org/doc/go1.11#debugging .
And then, since dwz (0.12.20190711-1), "If .debug_info section not present,
exit with 0. See also #931792 https://bugs.debian.org/931792,
https://sourceware.org/bugzilla/show_bug.cgi?id=24766 and
https://sourceware.org/git/?p=dwz.git;a=commit;h=51a7fba9895c0256888fe8996f37c598ca56749a
So, I recommend that dh_dwz should have a check added to ensure
the multifile actually exists before running objcopy, and if not,
dh_dwz probably should print some warnings, then exit gracefully with 0.
Anyhow, for golang-golang-x-tools, initially not wanting to disable
dh_dwz altogether, I tried the following workaround:
override_dh_dwz:
dh_dwz || :
But then I encountered a second problem: An empty
golang-golang-x-tools-dbgsym package
containing only /usr/lib/debug/.dwz/x86_64-linux-gnu/
got generated.
I realized this was previously fixed in debhelper (11.4.1):
* dh_strip: Remove empty /usr/lib/debug directories left over
by dh_dwz. Thanks to Ferenc Wágner for reporting the issue.
(Closes: #909303)
But perhaps these warning messages give a clue:
dh_strip: Could not find the BuildID in
debian/golang-golang-x-tools/usr/bin/findcall
dh_strip: Could not find the BuildID in
debian/golang-golang-x-tools/usr/bin/vet
...
Looking at
https://salsa.debian.org/debian/debhelper/commit/423cfce04719f41d7224d75155c4e7f9a97a10e9,
it appears to me that the fix for #909303:
doit('rmdir', '-p', '--ignore-fail-on-non-empty', "$tmp/usr/lib/debug");
currently gets to run only if BuildID was found.
Sorry, I probably should have filed a second bug report for dh_strip,
but these two issues seem related, and I am lazy. :-)
Many thanks!
Anthony Fok
- -- System Information:
Debian Release: bullseye/sid
APT prefers unstable
APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 4.19.0-5-amd64 (SMP w/4 CPU cores)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8),
LANGUAGE=en_CA.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages debhelper depends on:
ii autotools-dev 20180224.1
ii dh-autoreconf 19
ii dh-strip-nondeterminism 1.3.0-1
ii dpkg 1.19.7
ii dpkg-dev 1.19.7
ii dwz 0.12.20190723-1
ii file 1:5.37-5
ii libdpkg-perl 1.19.7
ii man-db 2.8.5-2
ii perl 5.28.1-6
ii po-debconf 1.0.21
debhelper recommends no packages.
Versions of packages debhelper suggests:
ii dh-make 2.201802
- -- no debconf information
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