Build libbpf on CI

.github/workflows/build.yml

@@ -35,6 +35,8 @@ jobs:
           libjansson-dev \
           libjemalloc-dev \
           libc-ares-dev \
+          libelf-dev \
+          libc6-dev-i386 \
           cmake \
           cmake-data
         echo 'CPPFLAGS=-fsanitize=address,undefined -fno-sanitize-recover=undefined -g' >> $GITHUB_ENV
@@ -75,6 +77,18 @@ jobs:
       run: |
         echo 'CC=gcc' >> $GITHUB_ENV
         echo 'CXX=g++' >> $GITHUB_ENV
+    - name: Build libbpf
+      if: matrix.http3 == 'http3' && matrix.compiler == 'clang' && runner.os == 'Linux'
+      run: |
+        git clone -b v0.4.0 https://github.com/libbpf/libbpf
+        cd libbpf
+        export PREFIX=$PWD/build
+        cd src
+        make install
+
+        EXTRA_AUTOTOOLS_OPTS="--with-libbpf"
+
+        echo 'EXTRA_AUTOTOOLS_OPTS='"$EXTRA_AUTOTOOLS_OPTS" >> $GITHUB_ENV
     - name: Build quictls/openssl
       if: matrix.http3 == 'http3'
       run: |
@@ -104,9 +118,9 @@ jobs:
     - name: Setup extra environment variables for HTTP/3
       if: matrix.http3 == 'http3'
       run: |
-        PKG_CONFIG_PATH="$PWD/openssl/build/lib/pkgconfig:$PWD/nghttp3/build/lib/pkgconfig:$PWD/ngtcp2/build/lib/pkgconfig:$PKG_CONFIG_PATH"
-        LDFLAGS="$LDFLAGS -Wl,-rpath,$PWD/openssl/build/lib"
-        EXTRA_AUTOTOOLS_OPTS="--enable-http3"
+        PKG_CONFIG_PATH="$PWD/openssl/build/lib/pkgconfig:$PWD/nghttp3/build/lib/pkgconfig:$PWD/ngtcp2/build/lib/pkgconfig:$PWD/libbpf/build/lib64/pkgconfig:$PKG_CONFIG_PATH"
+        LDFLAGS="$LDFLAGS -Wl,-rpath,$PWD/openssl/build/lib -Wl,-rpath,$PWD/libbpf/build/lib64"
+        EXTRA_AUTOTOOLS_OPTS="--enable-http3 $EXTRA_AUTOTOOLS_OPTS"
 
         echo 'PKG_CONFIG_PATH='"$PKG_CONFIG_PATH" >> $GITHUB_ENV
         echo 'LDFLAGS='"$LDFLAGS" >> $GITHUB_ENV

bpf/Makefile.am

@@ -34,4 +34,7 @@ $(builddir)/reuseport_kern.o: reuseport_kern.c
 	$(CC) @LIBBPF_CFLAGS@ @BPFCFLAGS@ @EXTRABPFCFLAGS@ \
 	  -target bpf -g -c $< -o $@
 
+clean-local:
+	-rm -f reuseport_kern.o
+
 endif # HAVE_LIBBPF