vdpa: add .gitignore

[mirror_iproute2.git] / configure

diff --git a/configure b/configure
index 307912aa9185f893d80cd7097e662f759cc125ba..2c363d3bbdd634d38f7ab40e060b43be9e5d9a6e 100755 (executable)
--- a/configure
+++ b/configure
@@ -2,6 +2,11 @@
 # SPDX-License-Identifier: GPL-2.0
 # This is not an autoconf generated configure
 #
+# Influential LIBBPF environment variables:
+#   LIBBPF_FORCE={on,off}   on: require link against libbpf;
+#                           off: disable libbpf probing
+#   LIBBPF_DIR              Path to libbpf DESTDIR to use
+
 INCLUDE=${1:-"$PWD/include"}
 
 # Output file which is input to Makefile
@@ -240,6 +245,111 @@ check_elf()
     fi
 }
 
+have_libbpf_basic()
+{
+    cat >$TMPDIR/libbpf_test.c <<EOF
+#include <bpf/libbpf.h>
+int main(int argc, char **argv) {
+    bpf_program__set_autoload(NULL, false);
+    bpf_map__ifindex(NULL);
+    bpf_map__set_pin_path(NULL, NULL);
+    bpf_object__open_file(NULL, NULL);
+    return 0;
+}
+EOF
+
+    $CC -o $TMPDIR/libbpf_test $TMPDIR/libbpf_test.c $LIBBPF_CFLAGS $LIBBPF_LDLIBS >/dev/null 2>&1
+    local ret=$?
+
+    rm -f $TMPDIR/libbpf_test.c $TMPDIR/libbpf_test
+    return $ret
+}
+
+have_libbpf_sec_name()
+{
+    cat >$TMPDIR/libbpf_sec_test.c <<EOF
+#include <bpf/libbpf.h>
+int main(int argc, char **argv) {
+    void *ptr;
+    bpf_program__section_name(NULL);
+    return 0;
+}
+EOF
+
+    $CC -o $TMPDIR/libbpf_sec_test $TMPDIR/libbpf_sec_test.c $LIBBPF_CFLAGS $LIBBPF_LDLIBS >/dev/null 2>&1
+    local ret=$?
+
+    rm -f $TMPDIR/libbpf_sec_test.c $TMPDIR/libbpf_sec_test
+    return $ret
+}
+
+check_force_libbpf_on()
+{
+    # if set LIBBPF_FORCE=on but no libbpf support, just exist the config
+    # process to make sure we don't build without libbpf.
+    if [ "$LIBBPF_FORCE" = on ]; then
+        echo " LIBBPF_FORCE=on set, but couldn't find a usable libbpf"
+        exit 1
+    fi
+}
+
+check_libbpf()
+{
+    # if set LIBBPF_FORCE=off, disable libbpf entirely
+    if [ "$LIBBPF_FORCE" = off ]; then
+        echo "no"
+        return
+    fi
+
+    if ! ${PKG_CONFIG} libbpf --exists && [ -z "$LIBBPF_DIR" ] ; then
+        echo "no"
+        check_force_libbpf_on
+        return
+    fi
+
+    if [ $(uname -m) = x86_64 ]; then
+        local LIBBPF_LIBDIR="${LIBBPF_DIR}/usr/lib64"
+    else
+        local LIBBPF_LIBDIR="${LIBBPF_DIR}/usr/lib"
+    fi
+
+    if [ -n "$LIBBPF_DIR" ]; then
+        LIBBPF_CFLAGS="-I${LIBBPF_DIR}/usr/include"
+        LIBBPF_LDLIBS="${LIBBPF_LIBDIR}/libbpf.a -lz -lelf"
+        LIBBPF_VERSION=$(PKG_CONFIG_LIBDIR=${LIBBPF_LIBDIR}/pkgconfig ${PKG_CONFIG} libbpf --modversion)
+    else
+        LIBBPF_CFLAGS=$(${PKG_CONFIG} libbpf --cflags)
+        LIBBPF_LDLIBS=$(${PKG_CONFIG} libbpf --libs)
+        LIBBPF_VERSION=$(${PKG_CONFIG} libbpf --modversion)
+    fi
+
+    if ! have_libbpf_basic; then
+        echo "no"
+        echo " libbpf version $LIBBPF_VERSION is too low, please update it to at least 0.1.0"
+        check_force_libbpf_on
+        return
+    else
+        echo "HAVE_LIBBPF:=y" >> $CONFIG
+        echo 'CFLAGS += -DHAVE_LIBBPF ' $LIBBPF_CFLAGS >> $CONFIG
+        echo "CFLAGS += -DLIBBPF_VERSION=\\\"$LIBBPF_VERSION\\\"" >> $CONFIG
+        echo 'LDLIBS += ' $LIBBPF_LDLIBS >> $CONFIG
+
+        if [ -z "$LIBBPF_DIR" ]; then
+            echo "CFLAGS += -DLIBBPF_DYNAMIC" >> $CONFIG
+        fi
+    fi
+
+    # bpf_program__title() is deprecated since libbpf 0.2.0, use
+    # bpf_program__section_name() instead if we support
+    if have_libbpf_sec_name; then
+        echo "HAVE_LIBBPF_SECTION_NAME:=y" >> $CONFIG
+        echo 'CFLAGS += -DHAVE_LIBBPF_SECTION_NAME ' >> $CONFIG
+    fi
+
+    echo "yes"
+    echo "     libbpf version $LIBBPF_VERSION"
+}
+
 check_selinux()
 # SELinux is a compile time option in the ss utility
 {
@@ -385,6 +495,9 @@ check_setns
 echo -n "SELinux support: "
 check_selinux
 
+echo -n "libbpf support: "
+check_libbpf
+
 echo -n "ELF support: "
 check_elf