Add cargo-build-bpf

sdk/bpf/env.sh

@@ -0,0 +1,39 @@
+#
+# Configures the BPF SDK environment
+#
+
+if [ -z "$bpf_sdk" ]; then
+  bpf_sdk=.
+fi
+
+# Ensure the sdk is installed
+"$bpf_sdk"/scripts/install.sh
+
+# Use the SDK's version of llvm to build the compiler-builtins for BPF
+export CC="$bpf_sdk/dependencies/llvm-native/bin/clang"
+export AR="$bpf_sdk/dependencies/llvm-native/bin/llvm-ar"
+export OBJDUMP="$bpf_sdk/dependencies/llvm-native/bin/llvm-objdump"
+export OBJCOPY="$bpf_sdk/dependencies/llvm-native/bin/llvm-objcopy"
+
+# Use the SDK's version of Rust to build for BPF
+export RUSTUP_TOOLCHAIN=bpf
+export RUSTFLAGS="
+    -C lto=no \
+    -C opt-level=2 \
+    -C link-arg=-z -C link-arg=notext \
+    -C link-arg=-T$bpf_sdk/rust/bpf.ld \
+    -C link-arg=--Bdynamic \
+    -C link-arg=-shared \
+    -C link-arg=--entry=entrypoint \
+    -C link-arg=-no-threads \
+    -C linker=$bpf_sdk/dependencies/llvm-native/bin/ld.lld"
+
+# CARGO may be set if run from within cargo, causing
+# incompatibilities between cargo and xargo versions
+unset CARGO
+
+export XARGO="$bpf_sdk"/dependencies/bin/xargo
+export XARGO_TARGET=bpfel-unknown-unknown
+export XARGO_HOME="$bpf_sdk/dependencies/xargo"
+export XARGO_RUST_SRC="$bpf_sdk/dependencies/rust-bpf-sysroot/src"
+export RUST_COMPILER_RT_ROOT="$bpf_sdk/dependencies/rust-bpf-sysroot/src/compiler-rt"