Support for building Android platforms

.github/workflows/ci.yml

@@ -131,6 +131,61 @@ jobs:
       - run: cargo test ${{ matrix.args }}
         shell: alpine.sh {0}
 
+  test-android:
+    name: Test on Android
+    strategy:
+      matrix:
+        include:
+          - rust-target: aarch64-linux-android
+            os-arch: amd64
+
+    runs-on: ubuntu-20.04
+
+    env:
+      CARGO_BUILD_TARGET: ${{ matrix.rust-target }}
+      CARGO_TERM_VERBOSE: 'true'
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          submodules: recursive
+
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get -y install \
+              gawk \
+              flex \
+              bison \
+              clang \
+              automake \
+              autopoint \
+              gcc-multilib \
+              build-essential
+
+      - name: Install Rust stable for ${{ matrix.rust-target }}
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ matrix.rust-target }}
+
+      - name: Install Android NDK
+        uses: nttld/setup-ndk@v1
+        id: setup-ndk
+        with:
+          ndk-version: r26d
+          # local-cache: true
+          # add-to-path: false
+
+      - name: Cargo test no run
+        run: cargo test --no-run
+        if: matrix.rust-target == 'aarch64-linux-android'
+        env:
+          RUSTFLAGS: -C linker=${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android30-clang
+          AR_aarch64_linux_android: ${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ar
+          CC_aarch64_linux_android: ${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android30-clang
+          CXX_aarch64_linux_android: ${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android30-clang++
+
   test-libbpf-rs:
     # check that libbpf-rs, one of the main consumers of the library, works with
     # this version of libbpf-sys
@@ -174,6 +229,7 @@ jobs:
     needs:
       - test-gnu
       - test-musl
+      - test-android
       - test-libbpf-rs
     runs-on: ubuntu-22.04
     steps:

android/AndroidFixup.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef ANDROID_FIXUP_H
+#define ANDROID_FIXUP_H
+static inline void *rawmemchr(const void *s, int c) {
+  const unsigned char *ptr = s;
+  while (1) {
+    if (*ptr == c)
+      return (void *)ptr;
+    ptr++;
+  }
+}
+/* workaround for canonicalize_file_name */
+#define canonicalize_file_name(path) realpath(path, NULL)
+#endif /* ANDROID_FIXUP_H */

android/android.h

@@ -0,0 +1,4 @@
+#pragma once
+#define __user
+#define __force
+typedef unsigned __poll_t;

android/argp.h

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef ELFUTILS_ARGP_H
+#define ELFUTILS_ARGP_H
+// We don't have an implementation, but elfutils unconditionally includes this,
+// and relies on its transitive includes in places.
+#include <errno.h>
+#endif /* ELFUTILS_ARGP_H */

android/libintl.h

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef ELFUTILS_LIBINTL_H
+#define ELFUTILS_LIBINTL_H
+/* no internalization */
+#define gettext(x) (x)
+#define dgettext(x, y) (y)
+#endif /* ELFUTILS_LIBINTL_H */

bindings.h

@@ -11,3 +11,8 @@
 #include "libbpf/src/btf.h"
 #include "libbpf/src/libbpf.h"
 #endif /* __LIBBPF_SYS_NOVENDOR */
+
+#if defined (__aarch64__) || defined (__arm__)
+#include <stdarg.h>
+typedef va_list __va_list_tag;
+#endif