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https://github.com/openvswitch/ovs
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d161c09927
C compiler warning options added by the "configure" script have until now been put into CFLAGS. However that option is supposed to be reserved for the user under Automake rules, so move them to AM_CFLAGS. Besides increased adherence to Automake rules, this is useful because AM_CFLAGS can be overridden on a per-target (e.g. program or library) basis, whereas CFLAGS cannot. In turn, building the sFlow library (which will be added in an upcoming commit) requires overriding the compiler flags to avoid some warning messages. (By modifying the warning flags, we avoid the need to modify the sFlow library in any way.)
239 lines
8.5 KiB
Plaintext
239 lines
8.5 KiB
Plaintext
# -*- autoconf -*-
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# Copyright (c) 2008, 2009 Nicira Networks.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at:
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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dnl OVS_CHECK_LINUX26
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dnl
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dnl Configure linux kernel source tree
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AC_DEFUN([OVS_CHECK_LINUX26], [
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AC_ARG_WITH([l26],
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[AC_HELP_STRING([--with-l26=/path/to/linux-2.6],
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[Specify the linux 2.6 kernel sources])],
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[KBUILD26="$withval"], [KBUILD26=])dnl
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if test -n "$KBUILD26"; then
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KBUILD26=`eval echo "$KBUILD26"`
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# The build directory is what the user provided.
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# Make sure that it exists.
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AC_MSG_CHECKING([for Linux 2.6 build directory])
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if test -d "$KBUILD26"; then
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AC_MSG_RESULT([$KBUILD26])
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AC_SUBST(KBUILD26)
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else
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AC_MSG_RESULT([no])
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AC_ERROR([source dir $KBUILD26 doesn't exist])
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fi
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# Debian breaks kernel headers into "source" header and "build" headers.
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# We want the source headers, but $KBUILD26 gives us the "build" headers.
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# Use heuristics to find the source headers.
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AC_MSG_CHECKING([for Linux 2.6 source directory])
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KSRC26=$KBUILD26
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if test ! -e $KSRC26/include/linux/kernel.h; then
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KSRC26=`(cd $KBUILD26 && pwd -P) | sed 's,-[[^-]]*$,-common,'`
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if test ! -e $KSRC26/include/linux/kernel.h; then
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AC_MSG_ERROR([cannot find source directory])
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fi
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fi
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AC_MSG_RESULT([$KSRC26])
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AC_MSG_CHECKING([for kernel version])
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patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC26/Makefile"`
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sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC26/Makefile"`
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if test -z "$patchlevel" || test -z "$sublevel"; then
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AC_ERROR([cannot determine kernel version])
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fi
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AC_MSG_RESULT([2.$patchlevel.$sublevel])
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if test "2.$patchlevel" != '2.6'; then
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if test "$BUILD26" = "$KSRC26"; then
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AC_ERROR([Linux kernel in $KBUILD26 is not version 2.6])
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else
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AC_ERROR([Linux kernel in build tree $KBUILD26 (source tree $KSRC26) is not version 2.6])
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fi
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fi
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if ! test -e "$KBUILD26"/include/linux/version.h || \
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! test -e "$KBUILD26"/include/linux/autoconf.h; then
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AC_MSG_ERROR([Linux kernel source in $KBUILD26 is not configured])
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fi
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OVS_CHECK_LINUX26_COMPAT
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fi
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AM_CONDITIONAL(L26_ENABLED, test -n "$KBUILD26")
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])
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dnl OVS_GREP_IFELSE(FILE, REGEX, IF-MATCH, IF-NO-MATCH)
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dnl
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dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
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AC_DEFUN([OVS_GREP_IFELSE], [
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AC_MSG_CHECKING([whether $2 matches in $1])
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grep '$2' $1 >/dev/null 2>&1
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status=$?
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case $status in
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0)
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AC_MSG_RESULT([yes])
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$3
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;;
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1)
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AC_MSG_RESULT([no])
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$4
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;;
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*)
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AC_MSG_ERROR([grep exited with status $status])
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;;
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esac
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])
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dnl OVS_DEFINE(NAME)
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dnl
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dnl Defines NAME to 1 in kcompat.h.
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AC_DEFUN([OVS_DEFINE], [
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echo '#define $1 1' >> datapath/linux-2.6/kcompat.h.new
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])
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AC_DEFUN([OVS_CHECK_VETH], [
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AC_MSG_CHECKING([whether to build veth module])
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if test "$sublevel" = 18; then
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AC_MSG_RESULT([yes])
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AC_SUBST([BUILD_VETH], 1)
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else
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AC_MSG_RESULT([no])
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fi
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])
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AC_DEFUN([OVS_CHECK_LOG2_H], [
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AC_MSG_CHECKING([for $KSRC26/include/linux/log2.h])
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if test -e $KSRC26/include/linux/log2.h; then
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AC_MSG_RESULT([yes])
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OVS_DEFINE([HAVE_LOG2_H])
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else
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AC_MSG_RESULT([no])
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fi
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])
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dnl OVS_CHECK_LINUX26_COMPAT
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dnl
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dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
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dnl the directory in $KBUILD26.
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AC_DEFUN([OVS_CHECK_LINUX26_COMPAT], [
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rm -f datapath/linux-2.6/kcompat.h.new
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mkdir -p datapath/linux-2.6
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: > datapath/linux-2.6/kcompat.h.new
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OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_transport_header],
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[OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
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OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [raw],
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[OVS_DEFINE([HAVE_MAC_RAW])])
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OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h],
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[skb_copy_from_linear_data_offset],
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[OVS_DEFINE([HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET])])
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OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [NLA_NUL_STRING],
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[OVS_DEFINE([HAVE_NLA_NUL_STRING])])
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OVS_GREP_IFELSE([$KSRC26/include/linux/err.h], [ERR_CAST],
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[OVS_DEFINE([HAVE_ERR_CAST])])
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OVS_GREP_IFELSE([$KSRC26/include/net/checksum.h], [csum_unfold],
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[OVS_DEFINE([HAVE_CSUM_UNFOLD])])
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OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_cow],
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[OVS_DEFINE([HAVE_SKB_COW])])
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# Check for the proto_data_valid member in struct sk_buff. The [^@]
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# is necessary because some versions of this header remove the
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# member but retain the kerneldoc comment that describes it (which
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# starts with @). The brackets must be doubled because of m4
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# quoting rules.
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OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [[[^@]]proto_data_valid],
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[OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
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OVS_CHECK_LOG2_H
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OVS_CHECK_VETH
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if cmp -s datapath/linux-2.6/kcompat.h.new \
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datapath/linux-2.6/kcompat.h >/dev/null 2>&1; then
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rm datapath/linux-2.6/kcompat.h.new
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else
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mv datapath/linux-2.6/kcompat.h.new datapath/linux-2.6/kcompat.h
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fi
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])
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dnl Checks for net/if_packet.h.
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AC_DEFUN([OVS_CHECK_IF_PACKET],
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[AC_CHECK_HEADER([net/if_packet.h],
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[HAVE_IF_PACKET=yes],
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[HAVE_IF_PACKET=no])
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AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
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if test "$HAVE_IF_PACKET" = yes; then
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AC_DEFINE([HAVE_IF_PACKET], [1],
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[Define to 1 if net/if_packet.h is available.])
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fi])
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dnl Checks for buggy strtok_r.
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dnl
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dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
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dnl with optimization that can cause segfaults:
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dnl
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dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
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AC_DEFUN([OVS_CHECK_STRTOK_R],
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[AC_CACHE_CHECK(
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[whether strtok_r macro segfaults on some inputs],
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[ovs_cv_strtok_r_bug],
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM([#include <stdio.h>
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#include <string.h>
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],
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[[char string[] = ":::";
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char *save_ptr = (char *) 0xc0ffee;
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char *token1, *token2;
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token1 = strtok_r(string, ":", &save_ptr);
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token2 = strtok_r(NULL, ":", &save_ptr);
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printf ("%s %s\n", token1, token2);
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return 0;
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]])],
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[ovs_cv_strtok_r_bug=no],
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[ovs_cv_strtok_r_bug=yes],
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[ovs_cv_strtok_r_bug=yes])])
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if test $ovs_cv_strtok_r_bug = yes; then
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AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
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[Define if strtok_r macro segfaults on some inputs])
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fi
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])
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dnl ----------------------------------------------------------------------
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dnl These macros are from GNU PSPP, with the following original license:
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dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
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dnl Check whether the given C compiler OPTION is accepted.
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dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
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AC_DEFUN([OVS_CHECK_CC_OPTION],
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[
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m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
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AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
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[ovs_save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS $1"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
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CFLAGS="$ovs_save_CFLAGS"])
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if test $ovs_cv_name = yes; then
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m4_if([$2], [], [:], [$2])
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else
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m4_if([$3], [], [:], [$3])
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fi
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])
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dnl OVS_ENABLE_OPTION([OPTION])
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dnl Check whether the given C compiler OPTION is accepted.
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dnl If so, add it to WARNING_FLAGS.
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dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
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AC_DEFUN([OVS_ENABLE_OPTION],
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[OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
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AC_SUBST([WARNING_FLAGS])])
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dnl ----------------------------------------------------------------------
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