src/configure.ac - fdio/vpp - Gitiles

 AC_INIT([vpp], [18.07], [vpp-dev@fd.io])
 LT_INIT
 AC_CONFIG_AUX_DIR([.])
 AM_INIT_AUTOMAKE([subdir-objects])
 AM_SILENT_RULES([yes])
 AC_CONFIG_FILES([ \
   Makefile \
   plugins/Makefile \
   vpp-api/python/Makefile \
   vpp-api/java/Makefile \
   vpp-api/vapi/Makefile \
   vlib/config.h \
 ])
 AC_CONFIG_MACRO_DIR([m4])

 AC_PROG_CC
 AC_PROG_CPP
 AM_PROG_AS
 AM_PROG_LIBTOOL
 AM_PATH_PYTHON

 AM_CONDITIONAL([CROSSCOMPILE], [test "$cross_compiling" == "yes"])

 ###############################################################################
 # Macros
 ###############################################################################

 AC_DEFUN([ENABLE_ARG],
 [
   AC_ARG_ENABLE($1,
     AC_HELP_STRING(patsubst([--enable-$1],[_],[-]), $2),
     [enable_$1=yes n_enable_$1=1],
     [enable_$1=no n_enable_$1=0])
   AM_CONDITIONAL(m4_toupper(ENABLE_$1), test "$enable_$1" = "yes")
   m4_append([list_of_enabled], [$1], [, ])
 ])

 AC_DEFUN([DISABLE_ARG],
 [
   AC_ARG_ENABLE($1,
     AC_HELP_STRING(patsubst([--disable-$1],[_],[-]), $2),
     [enable_$1=no n_enable_$1=0],
     [enable_$1=yes n_enable_$1=1])
   AM_CONDITIONAL(m4_toupper(ENABLE_$1), test "$enable_$1" = "yes")
   m4_append([list_of_enabled], [$1], [, ])
 ])

 AC_DEFUN([WITH_ARG],
 [
   AC_ARG_WITH($1,
     AC_HELP_STRING(patsubst([--with-$1],[_],[-]), $2),
     [with_$1=yes n_with_$1=1],
     [with_$1=no n_with_$1=0])
   AM_CONDITIONAL(m4_toupper(WITH_$1), test "$with_$1" = "yes")
   m4_append([list_of_with], [$1], [, ])
 ])

 AC_DEFUN([WITHOUT_ARG],
 [
   AC_ARG_WITH($1,
     AC_HELP_STRING(patsubst([--without-$1],[_],[-]), $2),
     [with_$1=no n_with_$1=0],
     [with_$1=yes n_with_$1=1])
   AM_CONDITIONAL(m4_toupper(WITH_$1), test "$with_$1" = "yes")
   m4_append([list_of_with], [$1], [, ])
 ])

 AC_DEFUN([PLUGIN_ENABLED],
 [
    AC_ARG_ENABLE($1_plugin,
      AC_HELP_STRING([--disable-$1-plugin], [Do not build $1 plugin]),
        [enable_$1_plugin=no],
        [enable_$1_plugin=yes ])
   AM_CONDITIONAL(m4_toupper(ENABLE_$1_PLUGIN), test "$enable_$1_plugin" = "yes")
   m4_append([list_of_plugins], [$1], [, ])
 ])

 AC_DEFUN([PLUGIN_DISABLED],
 [
    AC_ARG_ENABLE($1_plugin,
      AC_HELP_STRING([--enable-$1-plugin], [Build $1 plugin]),
        [enable_$1_plugin=yes ],
        [enable_$1_plugin=no])
   AM_CONDITIONAL(m4_toupper(ENABLE_$1_PLUGIN), test "$enable_$1_plugin" = "yes")
   m4_append([list_of_plugins], [$1], [, ])
 ])

 AC_DEFUN([PRINT_VAL], [ AC_MSG_RESULT(AC_HELP_STRING($1,$2)) ])

 AC_DEFUN([DPDK_IS_PMD_ENABLED],
 [
   AC_MSG_CHECKING([for $1 in rte_config.h])
   AC_COMPILE_IFELSE(
     [AC_LANG_PROGRAM(
       [[#include <rte_config.h>]],
       [[return RTE_$1;]],
     )],
     [with_$2=yes]
     [AC_MSG_RESULT([yes])],
     [with_$2=no]
     [AC_MSG_RESULT([no])]
   )
   AM_CONDITIONAL(m4_toupper(WITH_$2), test "$with_$2" = "yes")
   m4_append_uniq([list_of_with], [$2], [, ])
 ])

 # Check if compiler supports specific flag
 AC_DEFUN([CC_CHECK_FLAG],
 [
   AC_MSG_CHECKING([if $CC supports $1])
   AC_LANG_PUSH([C])
   ac_saved_cflags="$CFLAGS"
   CFLAGS="-Werror $1"
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
   [cc_flag_check=yes],
   [cc_flag_check=no]
 )
   AC_MSG_RESULT([$cc_flag_check])
   CFLAGS="$ac_saved_cflags"
   AC_LANG_POP([C])
 ])

 # This function deduces the BUILD HOST cache-line size by
 # inspecting /sys and/or /proc depending on the kernel / arch in use
 as_fn_log2_cache_line_size_p()
 {
   sysfs_cache_path="/sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size"
   m4_define([read_cache_line_size_from_sysfs], [`head -n 1 $1`])
   m4_define([read_midr_implementer],
             [`awk '/implementer/ {print $[]4;exit}' /proc/cpuinfo`])
   m4_define([read_midr_cpuid],
             [`awk '/part/ {print $[]4;exit}' /proc/cpuinfo`])

   #Check if sysfs path exists,to ignore warning, else do manual mapping
   AC_CHECK_FILE($sysfs_cache_path,
     [
       cache_line_size=read_cache_line_size_from_sysfs($sysfs_cache_path);
       if test $cache_line_size = "32"  ; then
           log2_cache_line_size="5";
       elif test $cache_line_size = "64"  ; then
           log2_cache_line_size="6";
       elif test $cache_line_size = "128"  ; then
           log2_cache_line_size="7";
       fi
       AC_MSG_NOTICE([cache_line_size/log2_cache_line_size deduced as $cache_line_size/$log2_cache_line_size])
     ],
     [
         #Define Implementer Ids here
         implementer_id_cavium=0x43

         #Define CPU Ids here
         cpu_id_cavium_thunderx_cn88xx=0x0a1
         cpu_id_cavium_thunderx2_cn99xx=0x0af

         implementer=read_midr_implementer()
         cpuid=read_midr_cpuid()

         AC_MSG_CHECKING([for implementerid/cpuid to set log2_cache_line_size])

         # Switch case to map log2_cache_line_size for implementer/cpuid combination.
         # Default case of Switch sets log2_cache_line_size to 6
         AS_CASE($implementer,
               #Switch Case for Cavium SoC's
               [$implementer_id_cavium],
                   [AS_CASE($cpuid,
                       #Only ThunderX2 is 64B. Remaining chips are 128B
                       [$cpu_id_cavium_thunderx2_cn99xx],
                             [AC_MSG_RESULT([Cavium/ThunderX2]);log2_cache_line_size=6],
                       [$cpu_id_cavium_thunderx_cn88xx],
                             [AC_MSG_RESULT([Cavium/ThunderX]);log2_cache_line_size=7],
                       [log2_cache_line_size=7;AC_MSG_RESULT([Cavium/OCTEONTx($cpuid)])]
                    )],
               #Add implementer specific case here:

               #Default case: 64B for all SoC's
               [log2_cache_line_size=6;AC_MSG_RESULT([$implementer/$cpuid])]
         )
       AC_MSG_NOTICE([log2_cache_line_size deduced as $log2_cache_line_size])
     ]
   )
   echo $log2_cache_line_size
 }

 ###############################################################################
 # configure arguments
 ###############################################################################

 # --enable-X
 ENABLE_ARG(tests,	[Enable unit tests])
 ENABLE_ARG(dpdk_shared,	[Enable unit tests])
 ENABLE_ARG(perftool,	[Enable perftool])
 ENABLE_ARG(g2,		[Enable g2])

 # --disable-X
 DISABLE_ARG(vlib,	[Disable vlib and dependant libs and binaries])
 DISABLE_ARG(svm,	[Disable svm and dependant libs and binaries])
 DISABLE_ARG(papi,	[Disable Python API bindings])
 DISABLE_ARG(japi,	[Disable Java API bindings])

 # --with-X

 # --without-X
 WITHOUT_ARG(libssl,	[Disable libssl])
 WITHOUT_ARG(apicli,	[Disable binary api CLI])
 WITHOUT_ARG(mbedtls,	[Disable mbedtls])
 WITHOUT_ARG(libnuma,	[for non numa architectures])

 AC_ARG_WITH(log2-cache-line-bytes,
             AC_HELP_STRING([--with-log2-cache-line-bytes],[Set the cache line size, --with-log2-cache-line-bytes=5|6|7|auto]),
 	    [case $with_log2_cache_line_bytes in
 	      5 | 6 | 7);;
 	      auto) with_log2_cache_line_bytes=`as_fn_log2_cache_line_size_p`;;
               *) with_log2_cache_line_bytes="CONFIG_ERROR";;
 	      esac],
               [with_log2_cache_line_bytes=`as_fn_log2_cache_line_size_p`])

 AC_ARG_WITH(unix,
             AC_HELP_STRING([--with-unix],[Compile unix version of clib]),
 	    [],
 	    [case $host_os in
 	      darwin* | linux*) with_unix=yes;;
 	      *) with_unix=no;;
 	      esac])

 AM_CONDITIONAL(WITH_UNIX, test "$with_unix" = "yes")

 AC_ARG_WITH(pre-data,
             AC_HELP_STRING([--with-pre-data],[Set buffer rewrite space]),
 	    [case $with_pre_data in
 	       128) ;;
 	       256) ;;
                *) with_pre_data="pre-data-not-set" ;;
 	     esac], [with_pre_data=128])

 ###############################################################################
 # Target CPU flags
 ###############################################################################

 # Check if compiler supports march=core-avx2
 CC_CHECK_FLAG("-march=core-avx2")
 AS_IF([test "$cc_flag_check" = yes],
       [march_core_avx2=yes],
       [march_core_avx2=no])
 AM_CONDITIONAL([CC_SUPPORTS_AVX2], [test "$march_core_avx2" = "yes"])

 # Check if compiler supports march=skylake-avx512
 CC_CHECK_FLAG("-march=skylake-avx512")
 AS_IF([test "$cc_flag_check" = yes],
   [march_skylake_avx512=yes],
   [march_skylake_avx512=no])
 AM_CONDITIONAL([CC_SUPPORTS_AVX512], [test "$march_skylake_avx512" = "yes"])

 AS_CASE([$host_cpu],
 	[x86_64], [CPU_FLAGS="-march=corei7 -mtune=corei7-avx"],
 	[aarch64], [CPU_FLAGS="-march=armv8-a+crc"],
 	[CPU_FLAGS=""],
 )
 AC_SUBST([CPU_FLAGS])

 AC_SUBST([CPU_AVX2_FLAGS],"-march=core-avx2 -mtune=core-avx2")
 AC_SUBST([CPU_AVX512_FLAGS],"-march=skylake-avx512 -mtune=skylake-avx512")

 AM_CONDITIONAL([CPU_X86_64], [test "$host_cpu" = "x86_64"])
 AM_CONDITIONAL([CPU_AARCH64], [test "$host_cpu" = "aarch64"])

 ###############################################################################
 # misc compiler flags
 ###############################################################################

 CC_CHECK_FLAG("-Wno-address-of-packed-member")
 AS_IF([test "$cc_flag_check" = yes],
 	[CFLAGS="${CFLAGS} -Wno-address-of-packed-member"], [])

 ###############################################################################
 # Substitutions and defines
 ###############################################################################

 AC_SUBST(PRE_DATA_SIZE,		[$with_pre_data])
 AC_SUBST(LOG2_CACHE_LINE_BYTES, [$with_log2_cache_line_bytes])
 AC_SUBST(APICLI,		[-DVPP_API_TEST_BUILTIN=${n_with_apicli}])

 AC_DEFINE_UNQUOTED(DPDK_SHARED_LIB,	[${n_enable_dpdk_shared}])
 AC_DEFINE_UNQUOTED(WITH_LIBSSL,		[${n_with_libssl}])
 AC_DEFINE_UNQUOTED(WITH_MBEDTLS,	[${n_with_mbedtls}])
 AC_DEFINE_UNQUOTED(WITH_LIBNUMA,	[${n_with_libnuma}])


 # Silence following noise:
 # ar: `u' modifier ignored since `D' is the default (see `U')
 AR_FLAGS=cr
 AC_SUBST(AR_FLAGS)

 ###############################################################################
 # Plugins
 ###############################################################################

 # Please keep alphabetical order
 PLUGIN_ENABLED(abf)
 PLUGIN_ENABLED(acl)
 PLUGIN_ENABLED(avf)
 PLUGIN_ENABLED(cdp)
 PLUGIN_ENABLED(dpdk)
 PLUGIN_ENABLED(flowprobe)
 PLUGIN_ENABLED(gbp)
 PLUGIN_ENABLED(gtpu)
 PLUGIN_ENABLED(igmp)
 PLUGIN_ENABLED(ila)
 PLUGIN_ENABLED(ioam)
 PLUGIN_ENABLED(ixge)
 PLUGIN_ENABLED(l2e)
 PLUGIN_ENABLED(lacp)
 PLUGIN_ENABLED(lb)
 PLUGIN_ENABLED(marvell)
 PLUGIN_ENABLED(memif)
 PLUGIN_ENABLED(pppoe)
 PLUGIN_ENABLED(nat)
 PLUGIN_ENABLED(srv6ad)
 PLUGIN_ENABLED(srv6am)
 PLUGIN_ENABLED(srv6as)
 PLUGIN_ENABLED(stn)
 PLUGIN_ENABLED(tlsmbedtls)
 PLUGIN_ENABLED(tlsopenssl)

 ###############################################################################
 # Dependency checks
 ###############################################################################
 AC_CHECK_FUNC([memfd_create], [AC_DEFINE([HAVE_MEMFD_CREATE], [1], [Define if memfd exists])])

 AM_COND_IF([ENABLE_DPDK_SHARED],
 [
   AC_CHECK_HEADERS([rte_config.h],
     [],
     [AC_MSG_ERROR([DPDK header files not found])],)
   AC_CHECK_LIB( [dpdk], [rte_eal_init],
     [],
     [AC_MSG_ERROR([DPDK shared library not found])],)
 ])

 with_aesni_mb_lib=no
 with_isa_l_crypto_lib=no

 DPDK_IS_PMD_ENABLED(LIBRTE_PMD_AESNI_MB, dpdk_aesni_mb_pmd)
 DPDK_IS_PMD_ENABLED(LIBRTE_PMD_AESNI_GCM, dpdk_aesni_gcm_pmd)

 AM_COND_IF([WITH_DPDK_AESNI_MB_PMD],
 [
   AC_CHECK_LIB([IPSec_MB], [submit_job_sse],
 	       [with_aesni_mb_lib=yes],
 	       [AC_MSG_ERROR([IPSec_MB library not found])])
 ])

 AM_COND_IF([WITH_DPDK_AESNI_GCM_PMD],
 [
   AC_CHECK_LIB([IPSec_MB], [submit_job_sse],
     [with_aesni_mb_lib=yes],
     [AC_MSG_ERROR([IPSec_MB library not found])])
 ])

 m4_append([list_of_with], [aesni_mb_lib], [, ])
 AM_CONDITIONAL(WITH_AESNI_MB_LIB, test "$with_aesni_mb_lib" = "yes")

 m4_append([list_of_with], [isa_l_crypto_lib], [, ])
 AM_CONDITIONAL(WITH_ISA_L_CRYPTO_LIB, test "$with_isa_l_crypto_lib" = "yes")

 AM_COND_IF([ENABLE_G2],
 [
   PKG_CHECK_MODULES(g2, gtk+-2.0)
 ])

 AM_COND_IF([ENABLE_MARVELL_PLUGIN],
 [
   AC_CHECK_LIB( [musdk], [pp2_init],
     [],
     [
       AC_MSG_WARN([Marvell MUSDK library with PP2 support not found. Plugin disabled.])
       enable_marvell_plugin=no
       AM_CONDITIONAL(ENABLE_MARVELL_PLUGIN, false)
     ])
 ])

 AM_COND_IF([WITH_MBEDTLS], [],
 [
   AC_MSG_WARN([mbedtls not enabled. Disabling tlsmbedtls plugin])
   enable_tlsmbedtls_plugin=no
   AM_CONDITIONAL(ENABLE_TLSMBEDTLS_PLUGIN, false)
 ])

 AM_COND_IF([ENABLE_TLSMBEDTLS_PLUGIN],
 [
   AC_CHECK_HEADERS([mbedtls/ssl.h], [],
     [
       AC_MSG_WARN([mbedtls headers not found. TLS engine implementation disabled])
       enable_tlsmbedtls_plugin=no
       AM_CONDITIONAL(ENABLE_TLSMBEDTLS_PLUGIN, false)
     ], [])
 ])

 AM_COND_IF([WITH_LIBSSL],
 [
   AC_CHECK_LIB([ssl -lcrypto], [SSL_set_async_callback],
     [
       AC_DEFINE([HAVE_OPENSSL_ASYNC], [1], [Define if new openssl interface exists])
     ])
 ],
 [
   AC_MSG_WARN([openssl not enabled. Disabling tlsopenssl plugin])
   enable_tlsopenssl_plugin=no
   AM_CONDITIONAL(ENABLE_TLSOPENSSL_PLUGIN, false)
 ])

 ###############################################################################
 # JAVA
 ###############################################################################

 AM_COND_IF([ENABLE_JAPI],
 [
   AX_VPP_FIND_JDK8
   AC_SUBST(JAVA_HOME)
   AC_SUBST(JAVAC)
   AC_SUBST(JAVAH)
   AC_SUBST(JAR)
 ])

 ###############################################################################
 # PYTHON
 ###############################################################################

 AM_COND_IF([ENABLE_PAPI],
 [
   AM_PATH_PYTHON
 ])

 ###############################################################################
 # Output
 ###############################################################################

 AC_OUTPUT

 AC_MSG_RESULT([==============================================================================])
 PRINT_VAL([version], $PACKAGE $VERSION)
 PRINT_VAL([prefix], ${prefix})
 PRINT_VAL([libdir], ${libdir})
 PRINT_VAL([includedir], ${includedir})
 PRINT_VAL([CFLAGS], ${CFLAGS})
 PRINT_VAL([CPPFLAGS], ${CPPFLAGS})
 PRINT_VAL([LDFLAGS], ${LDFLAGS})
 PRINT_VAL([LOG2_CACHE_LINE_BYTES], ${with_log2_cache_line_bytes})
 AM_COND_IF([ENABLE_JAPI],
 [
   PRINT_VAL([JAVA_VERSION], ${JAVA_VERSION})
   PRINT_VAL([JAVA_HOME], ${JAVA_HOME})
 ])

 AC_MSG_RESULT([])
 AC_MSG_RESULT([with:])
 m4_foreach([x], m4_dquote(list_of_with), [
   AC_MSG_RESULT(AC_HELP_STRING(x, m4_join([], [${with_], x, [}])))
 ])

 AC_MSG_RESULT([])
 AC_MSG_RESULT([enabled:])
 m4_foreach([x], m4_dquote(list_of_enabled), [
   AC_MSG_RESULT(AC_HELP_STRING(x, m4_join([], [${enable_], x, [}])))
 ])

 AC_MSG_RESULT([])
 AC_MSG_RESULT([plugins:])
 m4_foreach([x], m4_dquote(list_of_plugins), [
   AC_MSG_RESULT(AC_HELP_STRING(x, m4_join([], [${enable_], x, [_plugin}])))
 ])
 AC_MSG_RESULT([==============================================================================])
	AC_INIT([vpp], [18.07], [vpp-dev@fd.io])
	LT_INIT
	AC_CONFIG_AUX_DIR([.])
	AM_INIT_AUTOMAKE([subdir-objects])
	AM_SILENT_RULES([yes])
	AC_CONFIG_FILES([ \
	Makefile \
	plugins/Makefile \
	vpp-api/python/Makefile \
	vpp-api/java/Makefile \
	vpp-api/vapi/Makefile \
	vlib/config.h \
	])
	AC_CONFIG_MACRO_DIR([m4])

	AC_PROG_CC
	AC_PROG_CPP
	AM_PROG_AS
	AM_PROG_LIBTOOL
	AM_PATH_PYTHON

	AM_CONDITIONAL([CROSSCOMPILE], [test "$cross_compiling" == "yes"])

	###############################################################################
	# Macros
	###############################################################################

	AC_DEFUN([ENABLE_ARG],
	[
	AC_ARG_ENABLE($1,
	AC_HELP_STRING(patsubst([--enable-$1],[_],[-]), $2),
	[enable_$1=yes n_enable_$1=1],
	[enable_$1=no n_enable_$1=0])
	AM_CONDITIONAL(m4_toupper(ENABLE_$1), test "$enable_$1" = "yes")
	m4_append([list_of_enabled], [$1], [, ])
	])

	AC_DEFUN([DISABLE_ARG],
	[
	AC_ARG_ENABLE($1,
	AC_HELP_STRING(patsubst([--disable-$1],[_],[-]), $2),
	[enable_$1=no n_enable_$1=0],
	[enable_$1=yes n_enable_$1=1])
	AM_CONDITIONAL(m4_toupper(ENABLE_$1), test "$enable_$1" = "yes")
	m4_append([list_of_enabled], [$1], [, ])
	])

	AC_DEFUN([WITH_ARG],
	[
	AC_ARG_WITH($1,
	AC_HELP_STRING(patsubst([--with-$1],[_],[-]), $2),
	[with_$1=yes n_with_$1=1],
	[with_$1=no n_with_$1=0])
	AM_CONDITIONAL(m4_toupper(WITH_$1), test "$with_$1" = "yes")
	m4_append([list_of_with], [$1], [, ])
	])

	AC_DEFUN([WITHOUT_ARG],
	[
	AC_ARG_WITH($1,
	AC_HELP_STRING(patsubst([--without-$1],[_],[-]), $2),
	[with_$1=no n_with_$1=0],
	[with_$1=yes n_with_$1=1])
	AM_CONDITIONAL(m4_toupper(WITH_$1), test "$with_$1" = "yes")
	m4_append([list_of_with], [$1], [, ])
	])

	AC_DEFUN([PLUGIN_ENABLED],
	[
	AC_ARG_ENABLE($1_plugin,
	AC_HELP_STRING([--disable-$1-plugin], [Do not build $1 plugin]),
	[enable_$1_plugin=no],
	[enable_$1_plugin=yes ])
	AM_CONDITIONAL(m4_toupper(ENABLE_$1_PLUGIN), test "$enable_$1_plugin" = "yes")
	m4_append([list_of_plugins], [$1], [, ])
	])

	AC_DEFUN([PLUGIN_DISABLED],
	[
	AC_ARG_ENABLE($1_plugin,
	AC_HELP_STRING([--enable-$1-plugin], [Build $1 plugin]),
	[enable_$1_plugin=yes ],
	[enable_$1_plugin=no])
	AM_CONDITIONAL(m4_toupper(ENABLE_$1_PLUGIN), test "$enable_$1_plugin" = "yes")
	m4_append([list_of_plugins], [$1], [, ])
	])

	AC_DEFUN([PRINT_VAL], [ AC_MSG_RESULT(AC_HELP_STRING($1,$2)) ])

	AC_DEFUN([DPDK_IS_PMD_ENABLED],
	[
	AC_MSG_CHECKING([for $1 in rte_config.h])
	AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	[[#include <rte_config.h>]],
	[[return RTE_$1;]],
	)],
	[with_$2=yes]
	[AC_MSG_RESULT([yes])],
	[with_$2=no]
	[AC_MSG_RESULT([no])]
	)
	AM_CONDITIONAL(m4_toupper(WITH_$2), test "$with_$2" = "yes")
	m4_append_uniq([list_of_with], [$2], [, ])
	])

	# Check if compiler supports specific flag
	AC_DEFUN([CC_CHECK_FLAG],
	[
	AC_MSG_CHECKING([if $CC supports $1])
	AC_LANG_PUSH([C])
	ac_saved_cflags="$CFLAGS"
	CFLAGS="-Werror $1"
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
	[cc_flag_check=yes],
	[cc_flag_check=no]
	)
	AC_MSG_RESULT([$cc_flag_check])
	CFLAGS="$ac_saved_cflags"
	AC_LANG_POP([C])
	])

	# This function deduces the BUILD HOST cache-line size by
	# inspecting /sys and/or /proc depending on the kernel / arch in use
	as_fn_log2_cache_line_size_p()
	{
	sysfs_cache_path="/sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size"
	m4_define([read_cache_line_size_from_sysfs], [`head -n 1 $1`])
	m4_define([read_midr_implementer],
	[`awk '/implementer/ {print $[]4;exit}' /proc/cpuinfo`])
	m4_define([read_midr_cpuid],
	[`awk '/part/ {print $[]4;exit}' /proc/cpuinfo`])

	#Check if sysfs path exists,to ignore warning, else do manual mapping
	AC_CHECK_FILE($sysfs_cache_path,
	[
	cache_line_size=read_cache_line_size_from_sysfs($sysfs_cache_path);
	if test $cache_line_size = "32" ; then
	log2_cache_line_size="5";
	elif test $cache_line_size = "64" ; then
	log2_cache_line_size="6";
	elif test $cache_line_size = "128" ; then
	log2_cache_line_size="7";
	fi
	AC_MSG_NOTICE([cache_line_size/log2_cache_line_size deduced as $cache_line_size/$log2_cache_line_size])
	],
	[
	#Define Implementer Ids here
	implementer_id_cavium=0x43

	#Define CPU Ids here
	cpu_id_cavium_thunderx_cn88xx=0x0a1
	cpu_id_cavium_thunderx2_cn99xx=0x0af

	implementer=read_midr_implementer()
	cpuid=read_midr_cpuid()

	AC_MSG_CHECKING([for implementerid/cpuid to set log2_cache_line_size])

	# Switch case to map log2_cache_line_size for implementer/cpuid combination.
	# Default case of Switch sets log2_cache_line_size to 6
	AS_CASE($implementer,
	#Switch Case for Cavium SoC's
	[$implementer_id_cavium],
	[AS_CASE($cpuid,
	#Only ThunderX2 is 64B. Remaining chips are 128B
	[$cpu_id_cavium_thunderx2_cn99xx],
	[AC_MSG_RESULT([Cavium/ThunderX2]);log2_cache_line_size=6],
	[$cpu_id_cavium_thunderx_cn88xx],
	[AC_MSG_RESULT([Cavium/ThunderX]);log2_cache_line_size=7],
	[log2_cache_line_size=7;AC_MSG_RESULT([Cavium/OCTEONTx($cpuid)])]
	)],
	#Add implementer specific case here:

	#Default case: 64B for all SoC's
	[log2_cache_line_size=6;AC_MSG_RESULT([$implementer/$cpuid])]
	)
	AC_MSG_NOTICE([log2_cache_line_size deduced as $log2_cache_line_size])
	]
	)
	echo $log2_cache_line_size
	}

	###############################################################################
	# configure arguments
	###############################################################################

	# --enable-X
	ENABLE_ARG(tests, [Enable unit tests])
	ENABLE_ARG(dpdk_shared, [Enable unit tests])
	ENABLE_ARG(perftool, [Enable perftool])
	ENABLE_ARG(g2, [Enable g2])

	# --disable-X
	DISABLE_ARG(vlib, [Disable vlib and dependant libs and binaries])
	DISABLE_ARG(svm, [Disable svm and dependant libs and binaries])
	DISABLE_ARG(papi, [Disable Python API bindings])
	DISABLE_ARG(japi, [Disable Java API bindings])

	# --with-X

	# --without-X
	WITHOUT_ARG(libssl, [Disable libssl])
	WITHOUT_ARG(apicli, [Disable binary api CLI])
	WITHOUT_ARG(mbedtls, [Disable mbedtls])
	WITHOUT_ARG(libnuma, [for non numa architectures])

	AC_ARG_WITH(log2-cache-line-bytes,
	AC_HELP_STRING([--with-log2-cache-line-bytes],[Set the cache line size, --with-log2-cache-line-bytes=5\|6\|7\|auto]),
	[case $with_log2_cache_line_bytes in
	5 \| 6 \| 7);;
	auto) with_log2_cache_line_bytes=`as_fn_log2_cache_line_size_p`;;
	*) with_log2_cache_line_bytes="CONFIG_ERROR";;
	esac],
	[with_log2_cache_line_bytes=`as_fn_log2_cache_line_size_p`])

	AC_ARG_WITH(unix,
	AC_HELP_STRING([--with-unix],[Compile unix version of clib]),
	[],
	[case $host_os in
	darwin* \| linux*) with_unix=yes;;
	*) with_unix=no;;
	esac])

	AM_CONDITIONAL(WITH_UNIX, test "$with_unix" = "yes")

	AC_ARG_WITH(pre-data,
	AC_HELP_STRING([--with-pre-data],[Set buffer rewrite space]),
	[case $with_pre_data in
	128) ;;
	256) ;;
	*) with_pre_data="pre-data-not-set" ;;
	esac], [with_pre_data=128])

	###############################################################################
	# Target CPU flags
	###############################################################################

	# Check if compiler supports march=core-avx2
	CC_CHECK_FLAG("-march=core-avx2")
	AS_IF([test "$cc_flag_check" = yes],
	[march_core_avx2=yes],
	[march_core_avx2=no])
	AM_CONDITIONAL([CC_SUPPORTS_AVX2], [test "$march_core_avx2" = "yes"])

	# Check if compiler supports march=skylake-avx512
	CC_CHECK_FLAG("-march=skylake-avx512")
	AS_IF([test "$cc_flag_check" = yes],
	[march_skylake_avx512=yes],
	[march_skylake_avx512=no])
	AM_CONDITIONAL([CC_SUPPORTS_AVX512], [test "$march_skylake_avx512" = "yes"])

	AS_CASE([$host_cpu],
	[x86_64], [CPU_FLAGS="-march=corei7 -mtune=corei7-avx"],
	[aarch64], [CPU_FLAGS="-march=armv8-a+crc"],
	[CPU_FLAGS=""],
	)
	AC_SUBST([CPU_FLAGS])

	AC_SUBST([CPU_AVX2_FLAGS],"-march=core-avx2 -mtune=core-avx2")
	AC_SUBST([CPU_AVX512_FLAGS],"-march=skylake-avx512 -mtune=skylake-avx512")

	AM_CONDITIONAL([CPU_X86_64], [test "$host_cpu" = "x86_64"])
	AM_CONDITIONAL([CPU_AARCH64], [test "$host_cpu" = "aarch64"])

	###############################################################################
	# misc compiler flags
	###############################################################################

	CC_CHECK_FLAG("-Wno-address-of-packed-member")
	AS_IF([test "$cc_flag_check" = yes],
	[CFLAGS="${CFLAGS} -Wno-address-of-packed-member"], [])

	###############################################################################
	# Substitutions and defines
	###############################################################################

	AC_SUBST(PRE_DATA_SIZE, [$with_pre_data])
	AC_SUBST(LOG2_CACHE_LINE_BYTES, [$with_log2_cache_line_bytes])
	AC_SUBST(APICLI, [-DVPP_API_TEST_BUILTIN=${n_with_apicli}])

	AC_DEFINE_UNQUOTED(DPDK_SHARED_LIB, [${n_enable_dpdk_shared}])
	AC_DEFINE_UNQUOTED(WITH_LIBSSL, [${n_with_libssl}])
	AC_DEFINE_UNQUOTED(WITH_MBEDTLS, [${n_with_mbedtls}])
	AC_DEFINE_UNQUOTED(WITH_LIBNUMA, [${n_with_libnuma}])


	# Silence following noise:
	# ar: `u' modifier ignored since `D' is the default (see `U')
	AR_FLAGS=cr
	AC_SUBST(AR_FLAGS)

	###############################################################################
	# Plugins
	###############################################################################

	# Please keep alphabetical order
	PLUGIN_ENABLED(abf)
	PLUGIN_ENABLED(acl)
	PLUGIN_ENABLED(avf)
	PLUGIN_ENABLED(cdp)
	PLUGIN_ENABLED(dpdk)
	PLUGIN_ENABLED(flowprobe)
	PLUGIN_ENABLED(gbp)
	PLUGIN_ENABLED(gtpu)
	PLUGIN_ENABLED(igmp)
	PLUGIN_ENABLED(ila)
	PLUGIN_ENABLED(ioam)
	PLUGIN_ENABLED(ixge)
	PLUGIN_ENABLED(l2e)
	PLUGIN_ENABLED(lacp)
	PLUGIN_ENABLED(lb)
	PLUGIN_ENABLED(marvell)
	PLUGIN_ENABLED(memif)
	PLUGIN_ENABLED(pppoe)
	PLUGIN_ENABLED(nat)
	PLUGIN_ENABLED(srv6ad)
	PLUGIN_ENABLED(srv6am)
	PLUGIN_ENABLED(srv6as)
	PLUGIN_ENABLED(stn)
	PLUGIN_ENABLED(tlsmbedtls)
	PLUGIN_ENABLED(tlsopenssl)

	###############################################################################
	# Dependency checks
	###############################################################################
	AC_CHECK_FUNC([memfd_create], [AC_DEFINE([HAVE_MEMFD_CREATE], [1], [Define if memfd exists])])

	AM_COND_IF([ENABLE_DPDK_SHARED],
	[
	AC_CHECK_HEADERS([rte_config.h],
	[],
	[AC_MSG_ERROR([DPDK header files not found])],)
	AC_CHECK_LIB( [dpdk], [rte_eal_init],
	[],
	[AC_MSG_ERROR([DPDK shared library not found])],)
	])

	with_aesni_mb_lib=no
	with_isa_l_crypto_lib=no

	DPDK_IS_PMD_ENABLED(LIBRTE_PMD_AESNI_MB, dpdk_aesni_mb_pmd)
	DPDK_IS_PMD_ENABLED(LIBRTE_PMD_AESNI_GCM, dpdk_aesni_gcm_pmd)

	AM_COND_IF([WITH_DPDK_AESNI_MB_PMD],
	[
	AC_CHECK_LIB([IPSec_MB], [submit_job_sse],
	[with_aesni_mb_lib=yes],
	[AC_MSG_ERROR([IPSec_MB library not found])])
	])

	AM_COND_IF([WITH_DPDK_AESNI_GCM_PMD],
	[
	AC_CHECK_LIB([IPSec_MB], [submit_job_sse],
	[with_aesni_mb_lib=yes],
	[AC_MSG_ERROR([IPSec_MB library not found])])
	])

	m4_append([list_of_with], [aesni_mb_lib], [, ])
	AM_CONDITIONAL(WITH_AESNI_MB_LIB, test "$with_aesni_mb_lib" = "yes")

	m4_append([list_of_with], [isa_l_crypto_lib], [, ])
	AM_CONDITIONAL(WITH_ISA_L_CRYPTO_LIB, test "$with_isa_l_crypto_lib" = "yes")

	AM_COND_IF([ENABLE_G2],
	[
	PKG_CHECK_MODULES(g2, gtk+-2.0)
	])

	AM_COND_IF([ENABLE_MARVELL_PLUGIN],
	[
	AC_CHECK_LIB( [musdk], [pp2_init],
	[],
	[
	AC_MSG_WARN([Marvell MUSDK library with PP2 support not found. Plugin disabled.])
	enable_marvell_plugin=no
	AM_CONDITIONAL(ENABLE_MARVELL_PLUGIN, false)
	])
	])

	AM_COND_IF([WITH_MBEDTLS], [],
	[
	AC_MSG_WARN([mbedtls not enabled. Disabling tlsmbedtls plugin])
	enable_tlsmbedtls_plugin=no
	AM_CONDITIONAL(ENABLE_TLSMBEDTLS_PLUGIN, false)
	])

	AM_COND_IF([ENABLE_TLSMBEDTLS_PLUGIN],
	[
	AC_CHECK_HEADERS([mbedtls/ssl.h], [],
	[
	AC_MSG_WARN([mbedtls headers not found. TLS engine implementation disabled])
	enable_tlsmbedtls_plugin=no
	AM_CONDITIONAL(ENABLE_TLSMBEDTLS_PLUGIN, false)
	], [])
	])

	AM_COND_IF([WITH_LIBSSL],
	[
	AC_CHECK_LIB([ssl -lcrypto], [SSL_set_async_callback],
	[
	AC_DEFINE([HAVE_OPENSSL_ASYNC], [1], [Define if new openssl interface exists])
	])
	],
	[
	AC_MSG_WARN([openssl not enabled. Disabling tlsopenssl plugin])
	enable_tlsopenssl_plugin=no
	AM_CONDITIONAL(ENABLE_TLSOPENSSL_PLUGIN, false)
	])

	###############################################################################
	# JAVA
	###############################################################################

	AM_COND_IF([ENABLE_JAPI],
	[
	AX_VPP_FIND_JDK8
	AC_SUBST(JAVA_HOME)
	AC_SUBST(JAVAC)
	AC_SUBST(JAVAH)
	AC_SUBST(JAR)
	])

	###############################################################################
	# PYTHON
	###############################################################################

	AM_COND_IF([ENABLE_PAPI],
	[
	AM_PATH_PYTHON
	])

	###############################################################################
	# Output
	###############################################################################

	AC_OUTPUT

	AC_MSG_RESULT([==============================================================================])
	PRINT_VAL([version], $PACKAGE $VERSION)
	PRINT_VAL([prefix], ${prefix})
	PRINT_VAL([libdir], ${libdir})
	PRINT_VAL([includedir], ${includedir})
	PRINT_VAL([CFLAGS], ${CFLAGS})
	PRINT_VAL([CPPFLAGS], ${CPPFLAGS})
	PRINT_VAL([LDFLAGS], ${LDFLAGS})
	PRINT_VAL([LOG2_CACHE_LINE_BYTES], ${with_log2_cache_line_bytes})
	AM_COND_IF([ENABLE_JAPI],
	[
	PRINT_VAL([JAVA_VERSION], ${JAVA_VERSION})
	PRINT_VAL([JAVA_HOME], ${JAVA_HOME})
	])

	AC_MSG_RESULT([])
	AC_MSG_RESULT([with:])
	m4_foreach([x], m4_dquote(list_of_with), [
	AC_MSG_RESULT(AC_HELP_STRING(x, m4_join([], [${with_], x, [}])))
	])

	AC_MSG_RESULT([])
	AC_MSG_RESULT([enabled:])
	m4_foreach([x], m4_dquote(list_of_enabled), [
	AC_MSG_RESULT(AC_HELP_STRING(x, m4_join([], [${enable_], x, [}])))
	])

	AC_MSG_RESULT([])
	AC_MSG_RESULT([plugins:])
	m4_foreach([x], m4_dquote(list_of_plugins), [
	AC_MSG_RESULT(AC_HELP_STRING(x, m4_join([], [${enable_], x, [_plugin}])))
	])
	AC_MSG_RESULT([==============================================================================])