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    Subject[RFC] UAPI: Check headers by compiling all together as C++
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    Here's a set of patches that inserts a step into the build process to make
    sure that the UAPI headers can all be built together with C++ (if the
    compiler being used supports C++). All but the final patch perform fixups,
    including:

    (1) Fix member names that conflict with C++ reserved words by providing
    alternates that can be used anywhere. An anonymous union is used so
    that that the conflicting name is still available outside of C++.

    (2) Fix the use of flexible arrays in structs that get embedded (which is
    illegal in C++).

    (3) Remove the use of internal kernel structs in UAPI structures.

    (4) Fix symbol collisions.

    (5) Replace usage of u32 and co. with __u32 and co.

    (6) Fix use of sparsely initialised arrays (which g++ doesn't implement).

    (7) Remove some use of PAGE_SIZE since this isn't valid outside of the
    kernel.

    And lastly:

    (8) Compile all of the UAPI headers (with a few exceptions) together as
    C++ to catch new errors occurring as part of the regular build
    process.

    The patches can also be found here:

    http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=uapi-check

    Thanks,
    David
    ---
    David Howells (11):
    UAPI: drm: Fix use of C++ keywords as structural members
    UAPI: keys: Fix use of C++ keywords as structural members
    UAPI: virtio_net: Fix use of C++ keywords as structural members
    UAPI: bcache: Fix use of embedded flexible array
    UAPI: coda: Don't use internal kernel structs in UAPI
    UAPI: netfilter: Fix symbol collision issues
    UAPI: nilfs2: Fix use of undefined byteswapping functions
    UAPI: sound: Fix use of u32 and co. in UAPI headers
    UAPI: ndctl: Fix g++-unsupported initialisation in headers
    UAPI: ndctl: Remove use of PAGE_SIZE
    UAPI: Check headers build for C++


    Makefile | 1
    include/linux/ndctl.h | 22 ++++
    include/uapi/drm/i810_drm.h | 7 +
    include/uapi/drm/msm_drm.h | 7 +
    include/uapi/linux/bcache.h | 2
    include/uapi/linux/coda_psdev.h | 4 +
    include/uapi/linux/keyctl.h | 7 +
    include/uapi/linux/ndctl.h | 20 ++-
    include/uapi/linux/netfilter/nfnetlink_cthelper.h | 2
    include/uapi/linux/netfilter_ipv4/ipt_ECN.h | 9 --
    include/uapi/linux/nilfs2_ondisk.h | 21 ++--
    include/uapi/linux/virtio_net.h | 7 +
    include/uapi/sound/skl-tplg-interface.h | 106 +++++++++---------
    scripts/headers-c++.sh | 124 +++++++++++++++++++++
    14 files changed, 255 insertions(+), 84 deletions(-)
    create mode 100644 include/linux/ndctl.h
    create mode 100755 scripts/headers-c++.sh

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