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    Subject[PATCH v3 bpf-next 14/14] samples: bpf: README: add preparation steps and sysroot info
    Date
    Add couple preparation steps: clean and configuration. Also add newly
    added sysroot support info to cross-compile section.
    ---
    samples/bpf/README.rst | 41 ++++++++++++++++++++++++++++++++++++-----
    1 file changed, 36 insertions(+), 5 deletions(-)

    diff --git a/samples/bpf/README.rst b/samples/bpf/README.rst
    index 5f27e4faca50..d5845d73ab7d 100644
    --- a/samples/bpf/README.rst
    +++ b/samples/bpf/README.rst
    @@ -14,6 +14,20 @@ Compiling requires having installed:
    Note that LLVM's tool 'llc' must support target 'bpf', list version
    and supported targets with command: ``llc --version``

    +Clean and configuration
    +-----------------------
    +
    +It can be needed to clean tools, samples or kernel before trying new arch or
    +after some changes (on demand)::
    +
    + make -C tools clean
    + make -C samples/bpf clean
    + make clean
    +
    +Configure kernel, defconfig for instance::
    +
    + make defconfig
    +
    Kernel headers
    --------------

    @@ -68,9 +82,26 @@ It is also possible to point make to the newly compiled 'llc' or
    Cross compiling samples
    -----------------------
    In order to cross-compile, say for arm64 targets, export CROSS_COMPILE and ARCH
    -environment variables before calling make. This will direct make to build
    -samples for the cross target.
    +environment variables before calling make. But do this before clean,
    +cofiguration and header install steps described above. This will direct make to
    +build samples for the cross target::
    +
    + export ARCH=arm64
    + export CROSS_COMPILE="aarch64-linux-gnu-"
    +
    +Headers can be also installed on RFC of target board if need to keep them in
    +sync (not necessarily and it creates a local "usr/include" directory also)::
    +
    + make INSTALL_HDR_PATH=~/some_sysroot/usr headers_install
    +
    +Pointing LLC and CLANG is not necessarily if it's installed on HOST and have
    +in its targets appropriate arm64 arch (usually it has several arches).
    +Build samples::
    +
    + make samples/bpf/
    +
    +Or build samples with SYSROOT if some header or library is absent in toolchain,
    +say libelf, providing address to file system containing headers and libs,
    +can be RFS of target board::

    -export ARCH=arm64
    -export CROSS_COMPILE="aarch64-linux-gnu-"
    -make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
    + make samples/bpf/ SYSROOT=~/some_sysroot
    --
    2.17.1
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