Re: [PATCH 00/15] kbuild: refactor headers_install and support compile-test of UAPI headers

[Masahiro Yamada <yamada.masahiro@socionext.com>]

On Tue, Jun 4, 2019 at 7:15 PM Masahiro Yamada
<yamada.masahiro@socionext.com> wrote:
>
>
> Multiple people have suggested to compile-test UAPI headers.
>
> Currently, Kbuild provides simple sanity checks by headers_check
> but they are not enough to catch bugs.
>
> The most recent patch I know is David Howells' work:
> https://patchwork.kernel.org/patch/10590203/
>
> I agree that we need better tests for UAPI headers,
> but I want to integrate it in a clean way.
>
> The idea that has been in my mind is to compile each header
> to make sure the selfcontainedness.
>
> Recently, Jani Nikula proposed a new syntax 'header-test-y'.
> https://patchwork.kernel.org/patch/10947005/
>
> So, I implemented UAPI compile-testing on top of that.
>
> When adding a new feature, cleaning the code first is a
> good practice.
>
> [1] Remove headers_install_all
>
> This target installs UAPI headers of all architectures
> in a single tree.
> It does not make sense to compile test of headers from
> multiple arches at the same time. Hence, removed.
>
> [2] Split header installation into 'make headers' and 'make headers_install'
>
> To compile-test UAPI headers, we need a work-directory somewhere
> to save objects and .*.cmd files.
>
> usr/include/ will be the work-directory.
>
> Since we cannot pollute the final destination of headers_install,
>
> I split the header installation into two stages.
>
> 'make headers' will build up
> the ready-to-install headers in usr/include,
> which will be also used as a work-directory for the compile-test.
>
> 'make headers_install' will copy headers
> from usr/include to $(INSTALL_HDR_PATH)/include.
>
> [3] Support compile-test of UAPI headers
>
> This is implemented in usr/include/Makefile
>
>
> Jani Nikula (1):
>   kbuild: add support for ensuring headers are self-contained
>
> Masahiro Yamada (14):
>   kbuild: remove headers_{install,check}_all
>   kbuild: remove stale dependency between Documentation/ and
>     headers_install
>   kbuild: make gdb_script depend on prepare0 instead of prepare
>   kbuild: fix Kconfig prompt of CONFIG_HEADERS_CHECK
>   kbuild: add CONFIG_HEADERS_INSTALL and loosen the dependency of
>     samples
>   kbuild: remove build_unifdef target in scripts/Makefile
>   kbuild: build all prerequisite of headers_install simultaneously
>   kbuild: add 'headers' target to build up ready-to-install uapi headers
>   kbuild: re-implement Makefile.headersinst without directory descending
>   kbuild: move hdr-inst shorthand to top Makefile
>   kbuild: simplify scripts/headers_install.sh
>   kbuild: deb-pkg: do not run headers_check
>   fixup: kbuild: add support for ensuring headers are self-contained
>   kbuild: compile test UAPI headers to ensure they are self-contained

Series, applied to linux-kbuild.


>  Documentation/kbuild/headers_install.txt |   7 --
>  Documentation/kbuild/makefiles.txt       |  13 ++-
>  Makefile                                 |  56 +++++-----
>  arch/arc/configs/tb10x_defconfig         |   1 +
>  arch/nds32/configs/defconfig             |   1 +
>  arch/parisc/configs/a500_defconfig       |   1 +
>  arch/parisc/configs/b180_defconfig       |   1 +
>  arch/parisc/configs/c3000_defconfig      |   1 +
>  arch/parisc/configs/default_defconfig    |   1 +
>  arch/powerpc/configs/ppc6xx_defconfig    |   1 +
>  arch/s390/configs/debug_defconfig        |   1 +
>  include/uapi/{linux => }/Kbuild          |   6 +-
>  init/Kconfig                             |  20 ++++
>  lib/Kconfig.debug                        |  25 +++--
>  samples/Kconfig                          |  14 ++-
>  samples/Makefile                         |   4 +-
>  scripts/Kbuild.include                   |   6 --
>  scripts/Makefile                         |   5 -
>  scripts/Makefile.build                   |   9 ++
>  scripts/Makefile.headersinst             | 132 ++++++++++-------------
>  scripts/Makefile.lib                     |   3 +
>  scripts/cc-system-headers.sh             |   8 ++
>  scripts/headers.sh                       |  29 -----
>  scripts/headers_install.sh               |  48 ++++-----
>  scripts/package/builddeb                 |   2 +-
>  usr/.gitignore                           |   1 -
>  usr/Makefile                             |   2 +
>  usr/include/.gitignore                   |   3 +
>  usr/include/Makefile                     | 132 +++++++++++++++++++++++
>  29 files changed, 329 insertions(+), 204 deletions(-)
>  rename include/uapi/{linux => }/Kbuild (77%)
>  create mode 100755 scripts/cc-system-headers.sh
>  delete mode 100755 scripts/headers.sh
>  create mode 100644 usr/include/.gitignore
>  create mode 100644 usr/include/Makefile
>
> --
> 2.17.1
>
>
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-- 
Best Regards
Masahiro Yamada