I tried explicitly xdeb-ing libcap2, and got yet another failure:
xdeb-run --only-explicit -a armel --prefer-apt --apt-source --debug
--force-rebuild libcap2
[...]
Building working tree cache ...
libcap2 -> attr (libattr1-dev)
libcap2 -> pam (libpam0g-dev)
Recursing: attr -> libcap2
Recursing: pam -> libcap2
Build sequence: attr* pam* libcap2*
[...]
===== Importing attr_1:2.4.46-3 =====
[...]
===== Importing pam_1.1.3-2ubuntu1 =====
[...]
===== Building libcap2_1:2.21-2 =====
[...]
dh_auto_build
make -j1
make[1]: Entering directory `/home/lool/xdeb-bash/libcap2'
make -C libcap all
make[2]: Entering directory `/home/lool/xdeb-bash/libcap2/libcap'
=> making cap_names.list.h from
/home/lool/xdeb-bash/libcap2/libcap/../libcap/include/linux/capability.h
perl -e 'while ($l=<>) { if ($l =~ /^\#define[ \t](CAP[_A-Z]+)[
\t]+([0-9]+)\s+$/) { $tok=$1; $val=$2; $tok =~ tr/A-Z/a-z/; print
"{\"$tok\",$val},\n"; } }'
/home/lool/xdeb-bash/libcap2/libcap/../libcap/include/linux/capability.h |
fgrep -v 0x > cap_names.list.h
gcc -O2 -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -fPIC
-I/home/lool/xdeb-bash/libcap2/libcap/../libcap/include
-I/home/lool/xdeb-bash/libcap2/libcap/../libcap/include _makenames.c -o
_makenames
[...]
dh_strip
arm-linux-gnueabi-strip --remove-section=.comment
--remove-section=.note --strip-unneeded
debian/libcap2-bin/lib/security/pam_cap.so
arm-linux-gnueabi-strip:debian/libcap2-bin/lib/security/pam_cap.so: File format
not recognized
dh_strip: arm-linux-gnueabi-strip --remove-section=.comment
--remove-section=.note --strip-unneeded
debian/libcap2-bin/lib/security/pam_cap.so returned exit code 1
make: *** [binary] Error 29
dpkg-buildpackage: error: fakeroot debian/rules binary gave error exit status 2
which is because it's not using a cross compiler; after fixing debian/rules to
set CC and BUILD_CC as in
https://launchpadlibrarian.net/37542685/libcap2_1%3A2.16-5ubuntu1_1%3A2.16-5ubuntu2%7Ecross1.diff.gz
but adapted for the new dh-based rules, it cross-built fine:
[...]
=> making cap_names.list.h from
/home/lool/xdeb-bash/libcap2/libcap/../libcap/include/linux/capability.h
perl -e 'while ($l=<>) { if ($l =~ /^\#define[ \t](CAP[_A-Z]+)[
\t]+([0-9]+)\s+$/) { $tok=$1; $val=$2; $tok =~ tr/A-Z/a-z/; print
"{\"$tok\",$val},\n"; } }'
/home/lool/xdeb-bash/libcap2/libcap/../libcap/include/linux/capability.h |
fgrep -v 0x > cap_names.list.h
gcc -O2 -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -fPIC
-I/home/lool/xdeb-bash/libcap2/libcap/../libcap/include
-I/home/lool/xdeb-bash/libcap2/libcap/../libcap/include _makenames.c -o
_makenames
./_makenames > cap_names.h
arm-linux-gnueabi-gcc -O2 -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Dlinux
-Wall -Wwrite-strings -Wpointer-arith -Wcast-qual -Wcast-align
-Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Winline -Wshadow -g
-fPIC -I/home/lool/xdeb-bash/libcap2/libcap/../libcap/include
-I/home/lool/xdeb-bash/libcap2/libcap/../libcap/include -c cap_alloc.c -o
cap_alloc.o
[...]
dpkg-deb: building package `libcap2-armel-cross' in
`./libcap2-armel-cross_2.21-2_all.deb'.
['libcap2-armel-cross_2.21-2_all.deb', 'libcap-dev-armel-cross_2.21-2_all.deb']
** Package changed: xdeb (Ubuntu) => libcap2 (Ubuntu)
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https://bugs.launchpad.net/bugs/872435
Title:
libcap2 fails to cross-build
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