Bug#977596: please error on static archive without any code sections

[Matthias Klose <doko@debian.org>]

Package: lintian

Please show an error on static archives without any code sections.  This happens
when a package ships a lib<foo>.a which is built with -flto=auto, but without
-ffat-lto-objects.  dh_strip already takes care of stripping the lto sections,
but maybe is leaving the .a file unusable.

see
https://github.com/rpm-software-management/rpmlint/blob/master/rpmlint/checks/BinariesCheck.py
(_check_no_text_in_archive function) for an implementation.

or a shell implementation:

readelf -W --section-headers lib<foo>.a \
 | sed -n '/^ *\[[ 0-9]*\]/s/ *\[[ 0-9]*\] *//p' \
 | awk 'BEGIN {rv=1} /^NULL/ {next} $1 ~
/^.(text|data|(preinit|init|fini)_array$)/ {if ($5 !~ /^0+$/) rv=0} END { exit rv}'

You can test this with e.g. xxhash, building with

  export DEB_CFLAGS_MAINT_APPEND = -flto=auto

and

  export DEB_CFLAGS_MAINT_APPEND = -flto=auto -ffat-lto-objects