cross-toolchain-base ftbfs with linux-4.18

that's how the "cross" build fails:

  WRAP arch/arm64/include/generated/asm/xor.h
  UPD include/generated/uapi/linux/version.h
  UPD include/generated/utsrelease.h
  HOSTCC scripts/basic/fixdep
  CC kernel/bounds.s
gcc: error: unrecognized command line option '-mlittle-endian'; did you mean '-fconvert=little-endian'?
make[5]: *** [Kbuild:21: kernel/bounds.s] Error 1
make[4]: *** [Makefile:1112: prepare0] Error 2
make[3]: *** [debian/rules:4: build] Error 2
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2
make[2]: *** [scripts/package/Makefile:72: deb-pkg] Error 2
make[1]: *** [Makefile:1370: deb-pkg] Error 2

the "native" build fails like:

  CC scripts/mod/empty.o
  HOSTCC scripts/mod/mk_elfconfig
  MKELF scripts/mod/elfconfig.h
  HOSTCC scripts/mod/modpost.o
  CC scripts/mod/devicetable-offsets.s
  UPD scripts/mod/devicetable-offsets.h
  HOSTCC scripts/mod/file2alias.o
  HOSTCC scripts/mod/sumversion.o
  HOSTLD scripts/mod/modpost
  HOSTCC scripts/selinux/genheaders/genheaders
  HOSTCC scripts/selinux/mdp/mdp
  HOSTCC scripts/kallsyms
  HOSTCC scripts/pnmtologo
  HOSTCC scripts/conmakehash
  HOSTCC scripts/sortextable
  HOSTCC scripts/asn1_compiler
  HOSTCC scripts/extract-cert
scripts/extract-cert.c:21:10: fatal error: openssl/bio.h: No such file or directory
 #include <openssl/bio.h>
          ^~~~~~~~~~~~~~~
compilation terminated.
make[5]: *** [scripts/Makefile.host:90: scripts/extract-cert] Error 1
make[4]: *** [Makefile:1076: scripts] Error 2
make[3]: *** [debian/rules:4: build] Error 2
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2
make[2]: *** [scripts/package/Makefile:72: deb-pkg] Error 2
make[1]: *** [Makefile:1370: deb-pkg] Error 2

I assume we can make that one an additional b-d, but these things shouldn't build

The better solution for this would be a build profile in the linux source that just builds the linux-libc-dev package. That way the cross-toolchain-base packaging would be independent from the linux build system.

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1792600

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

It looks like building the binary-arch-headers target should limit the build to the linux-libc-dev package.

right, now using that and checking in an autopkg test, so migration of kernels with a changed build system will block.