samples/bpf: Add documentation on cross compilation
Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Joel Fernandes <joelaf@google.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -64,3 +64,13 @@ It is also possible to point make to the newly compiled 'llc' or
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'clang' command via redefining LLC or CLANG on the make command line::
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make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
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Cross compiling samples
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-----------------------
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In order to cross-compile, say for arm64 targets, export CROSS_COMPILE and ARCH
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environment variables before calling make. This will direct make to build
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samples for the cross target.
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export ARCH=arm64
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export CROSS_COMPILE="aarch64-linux-gnu-"
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make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
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