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openvswitch.m4
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openvswitch.m4
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# -*- autoconf -*-
# Copyright (c) 2008-2016, 2019 Nicira, Inc.
#
# 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.
#
m4_include([m4/compat.m4])
dnl Checks for --enable-coverage and updates CFLAGS and LDFLAGS appropriately.
AC_DEFUN([OVS_CHECK_COVERAGE],
[AC_REQUIRE([AC_PROG_CC])
AC_ARG_ENABLE(
[coverage],
[AS_HELP_STRING([--enable-coverage],
[Enable gcov coverage tool.])],
[case "${enableval}" in
(yes) coverage=true ;;
(no) coverage=false ;;
(*) AC_MSG_ERROR([bad value ${enableval} for --enable-coverage]) ;;
esac],
[coverage=false])
if $coverage; then
# Autoconf by default puts "-g -O2" in CFLAGS. We need to remove the -O2
# option for coverage to be useful. This does it without otherwise
# interfering with anything that the user might have put there.
old_CFLAGS=$CFLAGS
CFLAGS=
for option in $old_CFLAGS; do
case $option in
(-O2) ;;
(*) CFLAGS="$CFLAGS $option" ;;
esac
done
OVS_CFLAGS="$OVS_CFLAGS --coverage"
OVS_LDFLAGS="$OVS_LDFLAGS --coverage"
fi])
dnl Checks for --enable-ndebug and defines NDEBUG if it is specified.
AC_DEFUN([OVS_CHECK_NDEBUG],
[AC_ARG_ENABLE(
[ndebug],
[AS_HELP_STRING([--enable-ndebug],
[Disable debugging features for max performance])],
[case "${enableval}" in
(yes) ndebug=true ;;
(no) ndebug=false ;;
(*) AC_MSG_ERROR([bad value ${enableval} for --enable-ndebug]) ;;
esac],
[ndebug=false])
AM_CONDITIONAL([NDEBUG], [test x$ndebug = xtrue])])
dnl Checks for --enable-usdt-probes and defines HAVE_USDT if it is specified.
AC_DEFUN([OVS_CHECK_USDT], [
AC_ARG_ENABLE(
[usdt-probes],
[AS_HELP_STRING([--enable-usdt-probes],
[Enable User Statically Defined Tracing (USDT) probes])],
[case "${enableval}" in
(yes) usdt=true ;;
(no) usdt=false ;;
(*) AC_MSG_ERROR([bad value ${enableval} for --enable-usdt-probes]) ;;
esac],
[usdt=false])
AC_MSG_CHECKING([whether USDT probes are enabled])
if test "$usdt" != true; then
AC_MSG_RESULT([no])
else
AC_MSG_RESULT([yes])
AC_CHECK_HEADER([sys/sdt.h], [],
[AC_MSG_ERROR([unable to find sys/sdt.h needed for USDT support])])
AC_DEFINE([HAVE_USDT_PROBES], [1],
[Define to 1 if USDT probes are enabled.])
fi
AM_CONDITIONAL([HAVE_USDT_PROBES], [test $usdt = true])
])
dnl Checks for MSVC x64 compiler.
AC_DEFUN([OVS_CHECK_WIN64],
[AC_CACHE_CHECK(
[for MSVC x64 compiler],
[cl_cv_x64],
[dnl "cl" writes x64 output to stdin:
if (cl) 2>&1 | grep 'x64' >/dev/null 2>&1; then
cl_cv_x64=yes
MSVC64_LDFLAGS=" /MACHINE:X64 "
MSVC_PLATFORM="x64"
else
cl_cv_x64=no
MSVC64_LDFLAGS=""
MSVC_PLATFORM="x86"
fi])
AC_SUBST([MSVC64_LDFLAGS])
AC_SUBST([MSVC_PLATFORM])
])
dnl Checks for WINDOWS.
AC_DEFUN([OVS_CHECK_WIN32],
[AC_CHECK_HEADER([windows.h],
[WIN32=yes],
[WIN32=no])
AM_CONDITIONAL([WIN32], [test "$WIN32" = yes])
if test "$WIN32" = yes; then
AC_ARG_WITH([pthread],
[AS_HELP_STRING([--with-pthread=DIR],
[root of the pthread-win32 directory])],
[
case "$withval" in
"" | y | ye | yes | n | no)
AC_MSG_ERROR([Invalid --with-pthread value])
;;
*)
PTHREAD_WIN32_DIR=$withval/lib
PTHREAD_WIN32_DIR_DLL=/$(echo ${withval} | ${SED} -e 's/://')/bin
PTHREAD_WIN32_DIR_DLL_WIN_FORM=$withval/bin
PTHREAD_INCLUDES=-I$withval/include
PTHREAD_LDFLAGS=-L$PTHREAD_WIN32_DIR
PTHREAD_LIBS="-lpthreadVC3"
AC_SUBST([PTHREAD_WIN32_DIR_DLL_WIN_FORM])
AC_SUBST([PTHREAD_WIN32_DIR_DLL])
AC_SUBST([PTHREAD_INCLUDES])
AC_SUBST([PTHREAD_LDFLAGS])
AC_SUBST([PTHREAD_LIBS])
;;
esac
], [
AC_MSG_ERROR([pthread directory not specified])
]
)
AC_ARG_WITH([debug],
[AS_HELP_STRING([--with-debug],
[Build without compiler optimizations])],
[
MSVC_CFLAGS="-O0"
AC_SUBST([MSVC_CFLAGS])
], [
MSVC_CFLAGS="-O2"
AC_SUBST([MSVC_CFLAGS])
]
)
AC_DEFINE([WIN32], [1], [Define to 1 if building on WIN32.])
AC_CHECK_TYPES([struct timespec], [], [], [[#include <time.h>]])
AH_BOTTOM([#ifdef WIN32
#include "include/windows/windefs.h"
#endif])
fi])
dnl OVS_CHECK_WINDOWS
dnl
dnl Configure Visual Studio solution build
AC_DEFUN([OVS_CHECK_VISUAL_STUDIO_DDK], [
if test "$WIN32" = yes; then
AC_ARG_WITH([vstudiotarget],
[AS_HELP_STRING([--with-vstudiotarget=target_type],
[Target type: Debug/Release])],
[
case "$withval" in
"Release") ;;
"Debug") ;;
*) AC_MSG_ERROR([No valid Visual Studio configuration found]) ;;
esac
VSTUDIO_CONFIG=$withval
], [
VSTUDIO_CONFIG="Debug"
]
)
AC_SUBST([VSTUDIO_CONFIG])
AC_ARG_WITH([vstudiotargetver],
[AS_HELP_STRING([--with-vstudiotargetver=target_ver1,target_ver2],
[Target versions: Win8,Win8.1,Win10])],
[
targetver=`echo "$withval" | tr -s , ' ' `
for ver in $targetver; do
case "$ver" in
"Win8") VSTUDIO_WIN8=true ;;
"Win8.1") VSTUDIO_WIN8_1=true ;;
"Win10") VSTUDIO_WIN10=true ;;
*) AC_MSG_ERROR([No valid Visual Studio target version found]) ;;
esac
done
], [
VSTUDIO_WIN8=true
VSTUDIO_WIN8_1=true
VSTUDIO_WIN10=true
]
)
AC_DEFINE([VSTUDIO_DDK], [1], [System uses the Visual Studio build target.])
fi
AM_CONDITIONAL([VSTUDIO_WIN8], [test -n "$VSTUDIO_WIN8"])
AM_CONDITIONAL([VSTUDIO_WIN8_1], [test -n "$VSTUDIO_WIN8_1"])
AM_CONDITIONAL([VSTUDIO_WIN10], [test -n "$VSTUDIO_WIN10"])
AM_CONDITIONAL([VSTUDIO_DDK], [test -n "$VSTUDIO_CONFIG"])
])
dnl Checks for Netlink support.
AC_DEFUN([OVS_CHECK_NETLINK],
[AC_CHECK_HEADER([linux/netlink.h],
[HAVE_NETLINK=yes],
[HAVE_NETLINK=no],
[#include <sys/socket.h>
])
AM_CONDITIONAL([HAVE_NETLINK], [test "$HAVE_NETLINK" = yes])
if test "$HAVE_NETLINK" = yes; then
AC_DEFINE([HAVE_NETLINK], [1],
[Define to 1 if Netlink protocol is available.])
fi])
dnl Checks for libcap-ng.
AC_DEFUN([OVS_CHECK_LIBCAPNG],
[AC_ARG_ENABLE(
[libcapng],
[AS_HELP_STRING([--disable-libcapng], [Disable Linux capability support])],
[case "${enableval}" in
(yes) libcapng=true ;;
(no) libcapng=false ;;
(*) AC_MSG_ERROR([bad value ${enableval} for --enable-libcapng]) ;;
esac],
[libcapng=check])
if test "$libcapng" != false; then
AC_CHECK_LIB([cap-ng], [capng_clear], [HAVE_LIBCAPNG=yes])
if test "$HAVE_LIBCAPNG" != yes; then
if test "$libcapng" = true ; then
AC_MSG_ERROR([libcap-ng support requested, but not found])
fi
if test "$libcapng" = check ; then
AC_MSG_WARN([cannot find libcap-ng.
--user option will not be supported on Linux.
(you may use --disable-libcapng to suppress this warning). ])
fi
fi
fi
AC_SUBST([HAVE_LIBCAPNG])
AM_CONDITIONAL([HAVE_LIBCAPNG], [test "$HAVE_LIBCAPNG" = yes])
if test "$HAVE_LIBCAPNG" = yes; then
AC_DEFINE([HAVE_LIBCAPNG], [1],
[Define to 1 if libcap-ng is available.])
CAPNG_LDADD="-lcap-ng"
AC_SUBST([CAPNG_LDADD])
fi])
dnl Checks for OpenSSL.
AC_DEFUN([OVS_CHECK_OPENSSL],
[AC_ARG_ENABLE(
[ssl],
[AS_HELP_STRING([--disable-ssl], [Disable OpenSSL support])],
[case "${enableval}" in
(yes) ssl=true ;;
(no) ssl=false ;;
(*) AC_MSG_ERROR([bad value ${enableval} for --enable-ssl]) ;;
esac],
[ssl=check])
if test "$ssl" != false; then
AX_CHECK_OPENSSL(
[HAVE_OPENSSL=yes],
[HAVE_OPENSSL=no
if test "$ssl" = check; then
AC_MSG_WARN([Cannot find openssl:
$SSL_PKG_ERRORS
OpenFlow connections over SSL will not be supported.
(You may use --disable-ssl to suppress this warning.)])
else
AC_MSG_ERROR([Cannot find openssl (use --disable-ssl to configure without SSL support)])
fi])
else
HAVE_OPENSSL=no
fi
AC_SUBST([HAVE_OPENSSL])
AM_CONDITIONAL([HAVE_OPENSSL], [test "$HAVE_OPENSSL" = yes])
if test "$HAVE_OPENSSL" = yes; then
AC_DEFINE([HAVE_OPENSSL], [1], [Define to 1 if OpenSSL is installed.])
fi
OPENSSL_SUPPORTS_SNI=no
if test $HAVE_OPENSSL = yes; then
save_CPPFLAGS=$CPPFLAGS
CPPFLAGS="$CPPFLAGS $SSL_INCLUDES"
AC_CHECK_DECL([SSL_set_tlsext_host_name], [OPENSSL_SUPPORTS_SNI=yes],
[], [#include <openssl/ssl.h>
])
if test $OPENSSL_SUPPORTS_SNI = yes; then
AC_DEFINE(
[OPENSSL_SUPPORTS_SNI], [1],
[Define to 1 if OpenSSL supports Server Name Indication (SNI).])
fi
CPPFLAGS=$save_CPPFLAGS
fi
AC_SUBST([OPENSSL_SUPPORTS_SNI])
])
dnl Checks for libraries needed by lib/socket-util.c.
AC_DEFUN([OVS_CHECK_SOCKET_LIBS],
[AC_CHECK_LIB([socket], [connect])
AC_SEARCH_LIBS([gethostbyname], [resolv])])
dnl Checks for the directory in which to store the PKI.
AC_DEFUN([OVS_CHECK_PKIDIR],
[AC_ARG_WITH(
[pkidir],
AS_HELP_STRING([--with-pkidir=DIR],
[PKI hierarchy directory [[LOCALSTATEDIR/lib/openvswitch/pki]]]),
[PKIDIR=$withval],
[PKIDIR='${localstatedir}/lib/openvswitch/pki'])
AC_SUBST([PKIDIR])])
dnl Checks for the directory in which to store pidfiles.
AC_DEFUN([OVS_CHECK_RUNDIR],
[AC_ARG_WITH(
[rundir],
AS_HELP_STRING([--with-rundir=DIR],
[directory used for pidfiles
[[LOCALSTATEDIR/run/openvswitch]]]),
[RUNDIR=$withval],
[RUNDIR='${localstatedir}/run/openvswitch'])
AC_SUBST([RUNDIR])])
dnl Checks for the directory in which to store logs.
AC_DEFUN([OVS_CHECK_LOGDIR],
[AC_ARG_WITH(
[logdir],
AS_HELP_STRING([--with-logdir=DIR],
[directory used for logs [[LOCALSTATEDIR/log/PACKAGE]]]),
[LOGDIR=$withval],
[LOGDIR='${localstatedir}/log/${PACKAGE}'])
AC_SUBST([LOGDIR])])
dnl Checks for the directory in which to store the Open vSwitch database.
AC_DEFUN([OVS_CHECK_DBDIR],
[AC_ARG_WITH(
[dbdir],
AS_HELP_STRING([--with-dbdir=DIR],
[directory used for conf.db [[SYSCONFDIR/PACKAGE]]]),
[DBDIR=$withval],
[DBDIR='${sysconfdir}/${PACKAGE}'])
AC_SUBST([DBDIR])])
dnl Defines HAVE_BACKTRACE if backtrace() is found.
AC_DEFUN([OVS_CHECK_BACKTRACE],
[AC_SEARCH_LIBS([backtrace], [execinfo ubacktrace],
[AC_DEFINE([HAVE_BACKTRACE], [1],
[Define to 1 if you have backtrace(3).])])])
dnl Defines HAVE_PERF_EVENT if linux/perf_event.h is found.
AC_DEFUN([OVS_CHECK_PERF_EVENT],
[AC_CHECK_HEADERS([linux/perf_event.h])])
dnl Checks for valgrind/valgrind.h.
AC_DEFUN([OVS_CHECK_VALGRIND],
[AC_CHECK_HEADERS([valgrind/valgrind.h])])
dnl Checks for Python 3.4 or later.
AC_DEFUN([OVS_CHECK_PYTHON3],
[AC_CACHE_CHECK(
[for Python 3 (version 3.4 or later)],
[ovs_cv_python3],
[if test -n "$PYTHON3"; then
ovs_cv_python3=$PYTHON3
else
ovs_cv_python3=no
for binary in python3 python3.4 python3.5 python3.6 python3.7; do
ovs_save_IFS=$IFS; IFS=$PATH_SEPARATOR
for dir in $PATH; do
IFS=$ovs_save_IFS
test -z "$dir" && dir=.
if test -x "$dir"/"$binary" && "$dir"/"$binary" -c 'import sys
if sys.hexversion >= 0x03040000 and sys.hexversion < 0x04000000:
sys.exit(0)
else:
sys.exit(1)'; then
ovs_cv_python3=$dir/$binary
break 2
fi
done
done
fi])
if test "$ovs_cv_python3" = no; then
AC_MSG_ERROR([Python 3.4 or later is required but not found in $PATH, please install it or set $PYTHON3 to point to it])
fi
AC_ARG_VAR([PYTHON3])
PYTHON3=$ovs_cv_python3])
dnl Checks for flake8.
AC_DEFUN([OVS_CHECK_FLAKE8],
[AC_CACHE_CHECK(
[for flake8],
[ovs_cv_flake8],
[if flake8 --version >/dev/null 2>&1; then
ovs_cv_flake8=yes
else
ovs_cv_flake8=no
fi])
AM_CONDITIONAL([HAVE_FLAKE8], [test "$ovs_cv_flake8" = yes])])
dnl Checks for sphinx.
AC_DEFUN([OVS_CHECK_SPHINX],
[AC_CHECK_PROGS(
[SPHINXBUILD], [sphinx-build-3 sphinx-build-2 sphinx-build], [none])
AC_ARG_VAR([SPHINXBUILD])
AM_CONDITIONAL([HAVE_SPHINX], [test "$SPHINXBUILD" != none])])
dnl Checks for compiler correctly emitting AVX512-VL vpermd instruction.
dnl GCC5 says it exports AVX512-VL, but it doesn't implement "vpermd" instruction
dnl resulting in compilation failures. To workaround this "reported vs actual"
dnl mismatch, we compile a small snippet, and conditionally enable AVX512-VL.
AC_DEFUN([OVS_CHECK_GCC_AVX512VL], [
AC_MSG_CHECKING([whether compiler correctly emits AVX512-VL])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([#include <immintrin.h>
static void __attribute__((__target__("avx512vl")))
check_permutexvar(void)
{
__m256i v_swap32a = _mm256_setr_epi32(0x0, 0x4, 0xF,
0xF, 0xF, 0xF,
0xF, 0xF);
v_swap32a = _mm256_permutexvar_epi32(v_swap32a,
v_swap32a);
}],[])],
[AC_MSG_RESULT([yes])
ovs_cv_gcc_avx512vl_good=yes],
[AC_MSG_RESULT([no])
ovs_cv_gcc_avx512vl_good=no])
if test "$ovs_cv_gcc_avx512vl_good" = yes; then
AC_DEFINE([HAVE_GCC_AVX512VL_GOOD], [1],
[Define to 1 if gcc implements the vpermd instruction.])
fi
AM_CONDITIONAL([HAVE_GCC_AVX512VL_GOOD],
[test "$ovs_cv_gcc_avx512vl_good" = yes])])
dnl Checks whether the build system implements the vpopcntdq instruction. The
dnl compiler and assembler each separately need to support vpopcntdq. In order
dnl to test the assembler with the below code snippet, set the optimization
dnl level of the function to "O0" so it won't be optimized away by the
dnl compiler.
AC_DEFUN([OVS_CHECK_AVX512VPOPCNTDQ], [
AC_MSG_CHECKING([whether compiler correctly emits AVX512-VPOPCNTDQ])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([#include <immintrin.h>
void
__attribute__((__target__("avx512vpopcntdq")))
__attribute__((optimize("O0")))
check_vpopcntdq(void)
{
__m512i v_test;
v_test = _mm512_popcnt_epi64(v_test);
}],[])],
[AC_MSG_RESULT([yes])
ovs_cv_avx512vpopcntdq_good=yes],
[AC_MSG_RESULT([no])
ovs_cv_avx512vpopcntdq_good=no])
if test "$ovs_cv_avx512vpopcntdq_good" = yes; then
AC_DEFINE([HAVE_AVX512VPOPCNTDQ], [1],
[Define to 1 if the build system implements the vpopcntdq
instruction.])
fi
AM_CONDITIONAL([HAVE_AVX512VPOPCNTDQ],
[test "$ovs_cv_avx512vpopcntdq_good" = yes])])
dnl Checks for binutils/assembler known issue with AVX512.
dnl Due to backports, we probe assembling a reproducer instead of checking
dnl binutils version string. More details, including ASM dumps and debug here:
dnl GCC: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90028
dnl The checking of binutils funcationality instead of LD version is similar
dnl to as how DPDK proposes to solve this issue:
dnl http://patches.dpdk.org/patch/71723/
AC_DEFUN([OVS_CHECK_BINUTILS_AVX512],
[AC_CACHE_CHECK(
[binutils avx512 assembler checks passing],
[ovs_cv_binutils_avx512_good],
[dnl Assemble a short snippet to test for issue in "build-aux" dir:
mkdir -p build-aux
OBJFILE=build-aux/binutils_avx512_check.o
GATHER_PARAMS='0x8(,%ymm1,1),%ymm0{%k2}'
if ($CC -dumpmachine | grep x86_64) >/dev/null 2>&1; then
echo "vpgatherqq $GATHER_PARAMS" | as --64 -o $OBJFILE -
if (objdump -d --no-show-raw-insn $OBJFILE | grep -q $GATHER_PARAMS) >/dev/null 2>&1; then
ovs_cv_binutils_avx512_good=yes
else
ovs_cv_binutils_avx512_good=no
dnl Explicitly disallow avx512f to stop compiler auto-vectorizing
dnl and causing zmm usage with buggy binutils versions.
CFLAGS="$CFLAGS -mno-avx512f"
fi
rm $OBJFILE
else
dnl non x86_64 architectures don't have avx512, so not affected
ovs_cv_binutils_avx512_good=no
fi])
if test "$ovs_cv_binutils_avx512_good" = yes; then
AC_DEFINE([HAVE_LD_AVX512_GOOD], [1],
[Define to 1 if binutils correctly supports AVX512.])
fi
AM_CONDITIONAL([HAVE_LD_AVX512_GOOD],
[test "$ovs_cv_binutils_avx512_good" = yes])])
dnl Checks for dot.
AC_DEFUN([OVS_CHECK_DOT],
[AC_CACHE_CHECK(
[for dot],
[ovs_cv_dot],
[dnl "dot" writes -V output to stderr:
if (dot -V) 2>&1 | grep '^dot - [[gG]]raphviz version' >/dev/null 2>&1; then
ovs_cv_dot=yes
else
ovs_cv_dot=no
fi])
AM_CONDITIONAL([HAVE_DOT], [test "$ovs_cv_dot" = yes])])
dnl Checks for groff.
AC_DEFUN([OVS_CHECK_GROFF],
[AC_CACHE_CHECK(
[for groff],
[ovs_cv_groff],
[if (groff -v) >/dev/null 2>&1; then
ovs_cv_groff=yes
else
ovs_cv_groff=no
fi])
AM_CONDITIONAL([HAVE_GROFF], [test "$ovs_cv_groff" = yes])])
dnl Checks for thread-local storage support.
dnl
dnl Checks whether the compiler and linker support the C11
dnl thread_local macro from <threads.h>, and if so defines
dnl HAVE_THREAD_LOCAL. If not, checks whether the compiler and linker
dnl support the GCC __thread extension, and if so defines
dnl HAVE___THREAD.
AC_DEFUN([OVS_CHECK_TLS],
[AC_CACHE_CHECK(
[whether $CC has <threads.h> that supports thread_local],
[ovs_cv_thread_local],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM([#include <threads.h>
static thread_local int var;], [return var;])],
[ovs_cv_thread_local=yes],
[ovs_cv_thread_local=no])])
if test $ovs_cv_thread_local = yes; then
AC_DEFINE([HAVE_THREAD_LOCAL], [1],
[Define to 1 if the C compiler and linker supports the C11
thread_local matcro defined in <threads.h>.])
else
AC_CACHE_CHECK(
[whether $CC supports __thread],
[ovs_cv___thread],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM([static __thread int var;], [return var;])],
[ovs_cv___thread=yes],
[ovs_cv___thread=no])])
if test $ovs_cv___thread = yes; then
AC_DEFINE([HAVE___THREAD], [1],
[Define to 1 if the C compiler and linker supports the
GCC __thread extenions.])
fi
fi])
dnl OVS_CHECK_ATOMIC_LIBS
dnl
dnl Check to see if -latomic is need for GCC atomic built-ins.
AC_DEFUN([OVS_CHECK_ATOMIC_LIBS],
[AC_SEARCH_LIBS([__atomic_load_8], [atomic])])
dnl OVS_CHECK_GCC4_ATOMICS
dnl
dnl Checks whether the compiler and linker support GCC 4.0+ atomic built-ins.
dnl A compile-time only check is not enough because the compiler defers
dnl unimplemented built-ins to libgcc, which sometimes also lacks
dnl implementations.
AC_DEFUN([OVS_CHECK_GCC4_ATOMICS],
[AC_CACHE_CHECK(
[whether $CC supports GCC 4.0+ atomic built-ins],
[ovs_cv_gcc4_atomics],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[#include <stdlib.h>
#define ovs_assert(expr) if (!(expr)) abort();
#define TEST_ATOMIC_TYPE(TYPE) \
{ \
TYPE x = 1; \
TYPE orig; \
\
__sync_synchronize(); \
ovs_assert(x == 1); \
\
__sync_synchronize(); \
x = 3; \
__sync_synchronize(); \
ovs_assert(x == 3); \
\
orig = __sync_fetch_and_add(&x, 1); \
ovs_assert(orig == 3); \
__sync_synchronize(); \
ovs_assert(x == 4); \
\
orig = __sync_fetch_and_sub(&x, 2); \
ovs_assert(orig == 4); \
__sync_synchronize(); \
ovs_assert(x == 2); \
\
orig = __sync_fetch_and_or(&x, 6); \
ovs_assert(orig == 2); \
__sync_synchronize(); \
ovs_assert(x == 6); \
\
orig = __sync_fetch_and_and(&x, 10); \
ovs_assert(orig == 6); \
__sync_synchronize(); \
ovs_assert(x == 2); \
\
orig = __sync_fetch_and_xor(&x, 10); \
ovs_assert(orig == 2); \
__sync_synchronize(); \
ovs_assert(x == 8); \
}]], [dnl
TEST_ATOMIC_TYPE(char);
TEST_ATOMIC_TYPE(unsigned char);
TEST_ATOMIC_TYPE(signed char);
TEST_ATOMIC_TYPE(short);
TEST_ATOMIC_TYPE(unsigned short);
TEST_ATOMIC_TYPE(int);
TEST_ATOMIC_TYPE(unsigned int);
TEST_ATOMIC_TYPE(long int);
TEST_ATOMIC_TYPE(unsigned long int);
TEST_ATOMIC_TYPE(long long int);
TEST_ATOMIC_TYPE(unsigned long long int);
])],
[ovs_cv_gcc4_atomics=yes],
[ovs_cv_gcc4_atomics=no])])
if test $ovs_cv_gcc4_atomics = yes; then
AC_DEFINE([HAVE_GCC4_ATOMICS], [1],
[Define to 1 if the C compiler and linker supports the GCC 4.0+
atomic built-ins.])
fi])
dnl OVS_CHECK_ATOMIC_ALWAYS_LOCK_FREE(SIZE)
dnl
dnl Checks __atomic_always_lock_free(SIZE, 0)
AC_DEFUN([OVS_CHECK_ATOMIC_ALWAYS_LOCK_FREE],
[AC_CACHE_CHECK(
[value of __atomic_always_lock_free($1)],
[ovs_cv_atomic_always_lock_free_$1],
[AC_COMPUTE_INT(
[ovs_cv_atomic_always_lock_free_$1],
[__atomic_always_lock_free($1, 0)],
[],
[ovs_cv_atomic_always_lock_free_$1=unsupported])])
if test ovs_cv_atomic_always_lock_free_$1 != unsupported; then
AC_DEFINE_UNQUOTED(
[ATOMIC_ALWAYS_LOCK_FREE_$1B],
[$ovs_cv_atomic_always_lock_free_$1],
[If the C compiler is GCC 4.7 or later, define to the return value of
__atomic_always_lock_free($1, 0). If the C compiler is not GCC or is
an older version of GCC, the value does not matter.])
fi])
dnl OVS_CHECK_POSIX_AIO
AC_DEFUN([OVS_CHECK_POSIX_AIO],
[AC_SEARCH_LIBS([aio_write], [rt])
AM_CONDITIONAL([HAVE_POSIX_AIO], [test "$ac_cv_search_aio_write" != no])])
dnl OVS_CHECK_INCLUDE_NEXT
AC_DEFUN([OVS_CHECK_INCLUDE_NEXT],
[AC_REQUIRE([gl_CHECK_NEXT_HEADERS])
gl_CHECK_NEXT_HEADERS([$1])])
dnl OVS_CHECK_PRAGMA_MESSAGE
AC_DEFUN([OVS_CHECK_PRAGMA_MESSAGE],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[_Pragma("message(\"Checking for pragma message\")")
]])],
[AC_DEFINE(HAVE_PRAGMA_MESSAGE,1,[Define if compiler supports #pragma
message directive])])
])
dnl OVS_LIBTOOL_VERSIONS sets the major, minor, micro version information for
dnl OVS_LTINFO variable. This variable locks libtool information for shared
dnl objects, allowing multiple versions with different ABIs to coexist.
AC_DEFUN([OVS_LIBTOOL_VERSIONS],
[AC_MSG_CHECKING(linker output version information)
OVS_MAJOR=`echo "$PACKAGE_VERSION" | sed -e 's/[[.]].*//'`
OVS_MINOR=`echo "$PACKAGE_VERSION" | sed -e "s/^$OVS_MAJOR//" -e 's/^.//' -e 's/[[.]].*//'`
OVS_MICRO=`echo "$PACKAGE_VERSION" | sed -e "s/^$OVS_MAJOR.$OVS_MINOR//" -e 's/^.//' -e 's/[[^0-9]].*//'`
OVS_LT_RELINFO="-release $OVS_MAJOR.$OVS_MINOR"
OVS_LT_VERINFO="-version-info $LT_CURRENT:$OVS_MICRO"
OVS_LTINFO="$OVS_LT_RELINFO $OVS_LT_VERINFO"
AC_MSG_RESULT([libX-$OVS_MAJOR.$OVS_MINOR.so.$LT_CURRENT.0.$OVS_MICRO)])
AC_SUBST(OVS_LTINFO)
])
dnl OVS does not use C++ itself, but it provides public header files
dnl that a C++ compiler should accept, so when --enable-Werror is in
dnl effect and a C++ compiler is available, we enable building a C++
dnl source file that #includes all the public headers, as a way to
dnl ensure that they are acceptable as C++.
AC_DEFUN([OVS_CHECK_CXX],
[AC_REQUIRE([AC_PROG_CXX])
AC_REQUIRE([OVS_ENABLE_WERROR])
AX_CXX_COMPILE_STDCXX([11], [], [optional])
if test $enable_Werror = yes && test $HAVE_CXX11 = 1; then
enable_cxx=:
AC_LANG_PUSH([C++])
AC_CHECK_HEADERS([atomic])
AC_LANG_POP([C++])
else
enable_cxx=false
fi
AM_CONDITIONAL([HAVE_CXX], [$enable_cxx])])
dnl Checks for unbound library.
AC_DEFUN([OVS_CHECK_UNBOUND],
[AC_CHECK_LIB(unbound, ub_ctx_create, [HAVE_UNBOUND=yes], [HAVE_UNBOUND=no])
if test "$HAVE_UNBOUND" = yes; then
AC_DEFINE([HAVE_UNBOUND], [1], [Define to 1 if unbound is detected.])
LIBS="$LIBS -lunbound"
fi
AM_CONDITIONAL([HAVE_UNBOUND], [test "$HAVE_UNBOUND" = yes])
AC_SUBST([HAVE_UNBOUND])])
dnl Checks for libunwind.
AC_DEFUN([OVS_CHECK_UNWIND],
[AC_CHECK_LIB([unwind], [unw_backtrace],
[AC_CHECK_HEADERS([libunwind.h], [HAVE_UNWIND=yes], [HAVE_UNWIND=no])],
[HAVE_UNWIND=no])
if test "$HAVE_UNWIND" = yes; then
AC_DEFINE([HAVE_UNWIND], [1], [Define to 1 if unwind is detected.])
LIBS="$LIBS -lunwind"
fi
AM_CONDITIONAL([HAVE_UNWIND], [test "$HAVE_UNWIND" = yes])
AC_SUBST([HAVE_UNWIND])])