configure.ac

# This file is part of SWIFT.
# Copyright (C) 2012 pedro.gonnet@durham.ac.uk.
#               2016 p.w.draper@durham.ac.uk.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Init the project.
AC_INIT([SWIFT],[0.8.5],[https://gitlab.cosma.dur.ac.uk/swift/swiftsim])
swift_config_flags="$*"

#  We want to stop when given unrecognised options. No subdirs so this is safe.
enable_option_checking=${enable_option_checking:-fatal}
if test -n "$ac_unrecognized_opts"; then
    case $enable_option_checking in
        no)
        ;;
        fatal)
            { $as_echo "$as_me: error: unrecognized options: $ac_unrecognized_opts" >&2
              { (exit 1); exit 1; }; }
        ;;
        *)
            $as_echo "$as_me: WARNING: unrecognized options: $ac_unrecognized_opts" >&2
        ;;
    esac
fi

AC_COPYRIGHT
AC_CONFIG_SRCDIR([src/space.c])
AC_CONFIG_AUX_DIR([.])
AM_INIT_AUTOMAKE([subdir-objects])

# Add local macro collection.
AC_CONFIG_MACRO_DIR([m4])

# Stop default CFLAGS from anyone except the environment.
: ${CFLAGS=""}

# Generate header file.
AM_CONFIG_HEADER(config.h)

# Find and test the compiler.
AX_CHECK_ENABLE_DEBUG
AC_PROG_CC
AM_PROG_CC_C_O

# If debug is selected then we also define SWIFT_DEVELOP_MODE to control
# any developer code options.
if test "x$ax_enable_debug" != "xno"; then
   AC_DEFINE([SWIFT_DEVELOP_MODE],1,[Enable developer code options])
fi

# C++ in GCC 6 and above has an issue with undefined the min() and max()
# macros. This hack works around that.
AC_DEFINE([_GLIBCXX_INCLUDE_NEXT_C_HEADERS],1,[Hack for min() and max() using g++ 6+])

# Enable POSIX and platform extension preprocessor macros.
AC_USE_SYSTEM_EXTENSIONS

# Check for compiler version and vendor.
AX_COMPILER_VENDOR
AX_COMPILER_VERSION

# Check whether we have a recent enough GCC
if test "$ax_cv_c_compiler_vendor" = "gnu"; then
   AX_COMPARE_VERSION([$ax_cv_c_compiler_version], [ge], [8.1.0],
		      [gcc_handles_avx512="yes"],
		      [gcc_handles_avx512="no"])
fi

#  Restrict support.
AC_C_RESTRICT

# logger
AC_ARG_ENABLE([logger],
	[AS_HELP_STRING([--enable-logger],
		[enable the particle logger]
	)],
	[with_logger="${enableval}"],
	[with_logger="no"]
)

if test "$with_logger" = "yes"; then
   AC_DEFINE([WITH_LOGGER], 1, [logger enabled])
   # The logger requires that long long is a 64bit type, let's
   # check that.
   AC_CHECK_SIZEOF([long long int])
   if test "$ac_cv_sizeof_long_long_int" != "8"; then
      AC_MSG_ERROR([The particle logger requires that 'long long int' has size 8 bytes])
   fi
fi
AM_CONDITIONAL([HAVELOGGER],[test $with_logger = "yes"])

# Interprocedural optimization support. Needs special handling for linking and
# archiving as well as compilation with Intels, needs to be done before
# libtool is configured (to use correct LD).
AC_ARG_ENABLE([ipo],
   [AS_HELP_STRING([--enable-ipo],
     [Enable interprocedural optimization @<:@no/yes@:>@]
   )],
   [enable_ipo="$enableval"],
   [enable_ipo="no"]
)

if test "$enable_ipo" = "yes"; then
   if test "$ax_cv_c_compiler_vendor" = "intel"; then
      CFLAGS="$CFLAGS -ip -ipo"
      LDFLAGS="$LDFLAGS -ipo"
      : ${AR="xiar"}
      : ${LD="xild"}
      AC_MSG_RESULT([added Intel interprocedural optimization support])
   elif test "$ax_cv_c_compiler_vendor" = "gnu"; then
      CFLAGS="$CFLAGS -flto"
      LDFLAGS="$LDFLAGS -flto"
      AX_COMPARE_VERSION($ax_cv_c_compiler_version, [ge], [5.0.0],
                          [
      : ${AR="gcc-ar"}
      : ${RANLIB="gcc-ranlib"}
                          ], [:] )
      AC_MSG_RESULT([added GCC interprocedural optimization support])
   elif test "$ax_cv_c_compiler_vendor" = "clang"; then
      CFLAGS="$CFLAGS -flto -fuse-ld=gold"
      LDFLAGS="$LDFLAGS -XCClinker -fuse-ld=gold"
      : ${AR="llvm-ar"}
      : ${LD="ld.gold"}
      : ${RANLIB="llvm-ranlib"}
      AC_MSG_RESULT([added LLVM interprocedural optimization support])
   else
      AC_MSG_WARN([Compiler does not support interprocedural optimization])
   fi
fi

# Check for MPI. Need to do this before characterising the compiler (C99 mode),
# as this changes the compiler.
# We should consider using AX_PROG_CC_MPI to replace AC_PROG_CC when compiling
# whole applications. There are issues with mixing compilers when using this
# macro. See
# http://lists.gnu.org/archive/html/autoconf-archive-maintainers/2011-05/msg00004.html.
AC_ARG_ENABLE([mpi],
    [AS_HELP_STRING([--enable-mpi],
      [Compile with functionality for distributed-memory parallelism using MPI @<:@yes/no@:>@]
    )],
    [enable_mpi="$enableval"],
    [enable_mpi="yes"]
)
good_mpi="yes"
if test "$enable_mpi" = "yes"; then
    AX_MPI([CC="$MPICC" AC_DEFINE(HAVE_MPI, 1, [Define if you have the MPI library.]) ])
    MPI_LIBRARY="Unknown MPI"

    # Various MPI implementations require additional libraries when also using
    # threads. Use mpirun (on PATH) as that seems to be only command with
    # version flag, allow MPIRUN to override for systems that insist on
    # a non-standard name (PRACE).
    : ${MPIRUN='mpirun'}
    if test "$MPIRUN" = "mpirun"; then
       AC_PATH_PROG([MPIRUN],[mpirun],[notfound])
    fi
    if test "$MPIRUN" = "notfound"; then
       # This may not be fatal (some systems do not allow mpirun on
       # development nodes)., so push on.
       AC_MSG_WARN([Cannot find mpirun command on PATH, thread support may not be correct])
    else
       # Special options we know about.
       # Intel: -mt_mpi
       # PLATFORM: -lmtmpi
       # OpenMPI: nothing, but library should be built correctly.
       # Set MPI_THREAD_LIBS and add to linker commands as necessary.
       AC_MSG_CHECKING([MPI threads options])
       version=`$MPIRUN -version 2>&1`
       case "$version" in
         *Intel*MPI*)
            MPI_THREAD_LIBS="-mt_mpi"
            MPI_LIBRARY="Intel MPI"
            AC_MSG_RESULT([Intel MPI])
         ;;
         *Platform*)
            MPI_THREAD_LIBS="-lmtmpi"
            MPI_LIBRARY="PLATFORM MPI"
            AC_MSG_RESULT([PLATFORM MPI])
         ;;
         *"Open MPI"*)
            MPI_THREAD_LIBS=""
            MPI_LIBRARY="Open MPI"
            AC_MSG_RESULT([Open MPI])
            #  OpenMPI should be 1.8.6 or later, if not complain.
            #  Version is last word on first line of -version output.
            revision=`mpirun -version 2>&1 | grep "Open MPI" | awk '{print $NF}'`
            AX_COMPARE_VERSION( $revision, [ge], [1.8.6],,[good_mpi="no"] )
            if test "$good_mpi" = "no"; then
                AC_MSG_WARN([
    Open MPI version should be at least 1.8.6 (is $revision)])
                enable_mpi="yes (but with warning)"
            fi
         ;;
         *)
            MPI_THREAD_LIBS=""
            AC_MSG_RESULT([unknown])
         ;;
       esac
       AC_SUBST([MPI_THREAD_LIBS])
    fi
    AC_DEFINE_UNQUOTED([SWIFT_MPI_LIBRARY], ["$MPI_LIBRARY"], [The MPI library name, if known.])
fi
AM_CONDITIONAL([HAVEMPI],[test $enable_mpi = "yes"])

# Indicate that MPIRUN can be modified by an environment variable
AC_ARG_VAR(MPIRUN, Path to the mpirun command if non-standard)

# Add libtool support (now that CC is defined).
LT_INIT

# Need C99 and inline support.
AC_PROG_CC_C99
AC_C_INLINE

# If debugging try to show inlined functions.
if test "x$enable_debug" = "xyes"; then
   #  Show inlined functions.
   if test "$ax_cv_c_compiler_vendor" = "gnu"; then
      # Would like to use -gdwarf and let the compiler pick a good version
      # but that doesn't always work.
      AX_CHECK_COMPILE_FLAG([-gdwarf -fvar-tracking-assignments],
        [inline_EXTRA_FLAGS="-gdwarf -fvar-tracking-assignments"],
        [inline_EXTRA_FLAGS="-gdwarf-2 -fvar-tracking-assignments"])
      CFLAGS="$CFLAGS $inline_EXTRA_FLAGS"
   elif test "$ax_cv_c_compiler_vendor" = "intel"; then
      CFLAGS="$CFLAGS -debug inline-debug-info"
   fi
fi

# Check if task debugging is on.
AC_ARG_ENABLE([task-debugging],
   [AS_HELP_STRING([--enable-task-debugging],
     [Store extra information for generating task dump files @<:@yes/no@:>@]
   )],
   [enable_task_debugging="$enableval"],
   [enable_task_debugging="no"]
)
if test "$enable_task_debugging" = "yes"; then
   AC_DEFINE([SWIFT_DEBUG_TASKS],1,[Enable task debugging])
fi

# Check if threadpool debugging is on.
AC_ARG_ENABLE([threadpool-debugging],
   [AS_HELP_STRING([--enable-threadpool-debugging],
     [Store threadpool mapper timing information and generate threadpool dump files @<:@yes/no@:>@]
   )],
   [enable_threadpool_debugging="$enableval"],
   [enable_threadpool_debugging="no"]
)
if test "$enable_threadpool_debugging" = "yes"; then
   AC_DEFINE([SWIFT_DEBUG_THREADPOOL],1,[Enable threadpool debugging])
   LDFLAGS="$LDFLAGS -rdynamic"
fi

# Check if the general timers are switched on.
AC_ARG_ENABLE([timers],
   [AS_HELP_STRING([--enable-timers],
     [Activate the basic timers @<:@yes/no@:>@]
   )],
   [enable_timers="$enableval"],
   [enable_timers="no"]
)
if test "$enable_timers" = "yes"; then
   AC_DEFINE([SWIFT_USE_TIMERS],1,[Enable individual timers])
fi

# Check if expensive debugging is on.
AC_ARG_ENABLE([debugging-checks],
   [AS_HELP_STRING([--enable-debugging-checks],
     [Activate expensive consistency checks @<:@yes/no@:>@]
   )],
   [enable_debugging_checks="$enableval"],
   [enable_debugging_checks="no"]
)
if test "$enable_debugging_checks" = "yes"; then
   AC_DEFINE([SWIFT_DEBUG_CHECKS],1,[Enable expensive debugging])
fi

# Check if cell graph is on.
AC_ARG_ENABLE([cell-graph],
   [AS_HELP_STRING([--enable-cell-graph],
     [Activate the cell graph @<:@yes/no@:>@]
   )],
   [enable_cell_graph="$enableval"],
   [enable_cell_graph="no"]
)
if test "$enable_cell_graph" = "yes"; then
   AC_DEFINE([SWIFT_CELL_GRAPH],1,[Enable cell graph])
fi

# Check if using our custom icbrtf is enalbled.
AC_ARG_ENABLE([custom-icbrtf],
   [AS_HELP_STRING([--enable-custom-icbrtf],
     [Use SWIFT's custom icbrtf function instead of the system cbrtf @<:@yes/no@:>@]
   )],
   [enable_custom_icbrtf="$enableval"],
   [enable_custom_icbrtf="no"]
)
if test "$enable_custom_icbrtf" = "yes"; then
   AC_DEFINE([WITH_ICBRTF],1,[Enable custom icbrtf])
fi

# Check whether we want to default to naive cell interactions
AC_ARG_ENABLE([naive-interactions],
   [AS_HELP_STRING([--enable-naive-interactions],
     [Activate use of naive cell interaction functions @<:@yes/no@:>@]
   )],
   [enable_naive_interactions="$enableval"],
   [enable_naive_interactions="no"]
)
if test "$enable_naive_interactions" = "yes"; then
   AC_DEFINE([SWIFT_USE_NAIVE_INTERACTIONS],1,[Enable use of naive cell interaction functions])
fi

# Check whether we want to default to naive cell interactions (stars)
AC_ARG_ENABLE([naive-interactions-stars],
   [AS_HELP_STRING([--enable-naive-interactions-stars],
     [Activate use of naive cell interaction functions for stars @<:@yes/no@:>@]
   )],
   [enable_naive_interactions_stars="$enableval"],
   [enable_naive_interactions_stars="no"]
)
if test "$enable_naive_interactions_stars" = "yes"; then
   AC_DEFINE([SWIFT_USE_NAIVE_INTERACTIONS_STARS],1,[Enable use of naive cell interaction functions for stars])
fi

# Check if gravity force checks are on for some particles.
AC_ARG_ENABLE([gravity-force-checks],
   [AS_HELP_STRING([--enable-gravity-force-checks],
     [Activate expensive brute-force gravity checks for a fraction 1/N of all particles @<:@N@:>@]
   )],
   [gravity_force_checks="$enableval"],
   [gravity_force_checks="no"]
)
if test "$gravity_force_checks" == "yes"; then
   AC_MSG_ERROR(Need to specify the fraction of particles to check when using --enable-gravity-force-checks!)
elif test "$gravity_force_checks" != "no"; then
   AC_DEFINE_UNQUOTED([SWIFT_GRAVITY_FORCE_CHECKS], [$enableval] ,[Enable gravity brute-force checks])
fi

# Check whether we want to switch on glass making
AC_ARG_ENABLE([glass-making],
   [AS_HELP_STRING([--enable-glass-making],
     [Activate the glass-making procedure by reversing the sign of gravity @<:@yes/no@:>@]
   )],
   [gravity_glass_making="$enableval"],
   [gravity_glass_making="no"]
)
if test "$gravity_glass_making" == "yes"; then
   AC_DEFINE([SWIFT_MAKE_GRAVITY_GLASS], 1, [Make the code run in a way to produce a glass file for gravity/cosmology])
fi

# Check if we want to zero the gravity forces for all particles below some ID.
AC_ARG_ENABLE([no-gravity-below-id],
   [AS_HELP_STRING([--enable-no-gravity-below-id],
     [Zeros the gravitational acceleration of all particles with an ID smaller than @<:@N@:>@]
   )],
   [no_gravity_below_id="$enableval"],
   [no_gravity_below_id="no"]
)
if test "$no_gravity_below_id" == "yes"; then
   AC_MSG_ERROR(Need to specify the ID below which particles get zero forces when using --enable-no-gravity-below-id!)
elif test "$no_gravity_below_id" != "no"; then
   AC_DEFINE_UNQUOTED([SWIFT_NO_GRAVITY_BELOW_ID], [$enableval] ,[Particles with smaller ID than this will have zero gravity forces])
fi

# Check if we want to use boundary particles.
AC_ARG_ENABLE([boundary-particles],
   [AS_HELP_STRING([--enable-boundary-particles],
     [Set all particles with an ID smaller than @<:@N@:>@ as boundary particles (i.e. receive zero gravity + hydro forces).]
   )],
   [boundary_particles="$enableval"],
   [boundary_particles="no"]
)
if test "$boundary_particles" == "yes"; then
   AC_MSG_ERROR(Need to specify the ID below which particles get zero forces when using --enable-boundary-particles!)
elif test "$boundary_particles" != "no"; then
   AC_DEFINE_UNQUOTED([SWIFT_NO_GRAVITY_BELOW_ID], [$enableval] ,[Particles with smaller ID than this will have zero gravity forces])
   AC_DEFINE_UNQUOTED([SWIFT_BOUNDARY_PARTICLES], [$enableval] ,[Particles with smaller ID than this will be considered as boundaries.])
fi

# Check whether we have any of the ARM v8.1 tick timers
AX_ASM_ARM_PMCCNTR
AX_ASM_ARM_CNTVCT

# See if we want memuse reporting.
AC_ARG_ENABLE([memuse-reports],
   [AS_HELP_STRING([--enable-memuse-reports],
     [Output reports about significant memory allocations@<:@yes/no@:>@]
   )],
   [enable_memuse_reports="$enableval"],
   [enable_memuse_reports="no"]
)
if test "$enable_memuse_reports" = "yes"; then
   AC_DEFINE([SWIFT_MEMUSE_REPORTS],1,[Enable memory usage reports])
fi

# Check if we want to make the dumper thread active.
AC_ARG_ENABLE([dumper],
   [AS_HELP_STRING([--enable-dumper],
     [Dump active tasks and memory use (if configured)@<:@yes/no@:>@]
   )],
   [enable_dumper="$enableval"],
   [enable_dumper="no"]
)
if test "$enable_dumper" = "yes"; then
   AC_DEFINE([SWIFT_DUMPER_THREAD],1,[Enable dumper thread])
fi

# See if we want mpi reporting.
AC_ARG_ENABLE([mpiuse-reports],
   [AS_HELP_STRING([--enable-mpiuse-reports],
     [Output reports about MPI tasks requests@<:@yes/no@:>@]
   )],
   [enable_mpiuse_reports="$enableval"],
   [enable_mpiuse_reports="no"]
)
if test "$enable_mpiuse_reports" = "yes"; then
   AC_DEFINE([SWIFT_MPIUSE_REPORTS],1,[Enable MPI task reports])
fi


# Define HAVE_POSIX_MEMALIGN if it works.
AX_FUNC_POSIX_MEMALIGN

# Only optimize if allowed, otherwise assume user will set CFLAGS as
# appropriate.
AC_ARG_ENABLE([optimization],
   [AS_HELP_STRING([--enable-optimization],
     [Enable compile time optimization flags for host @<:@yes/no@:>@]
   )],
   [enable_opt="$enableval"],
   [enable_opt="yes"]
)

#  Disable vectorisation for known compilers. This switches off optimizations
#  that could be enabled above, so in general should be appended. Slightly odd
#  implementation as want to describe as --disable-vec, but macro is enable
#  (there is no enable action).
AC_ARG_ENABLE([vec],
   [AS_HELP_STRING([--disable-vec],
     [Disable vectorization]
   )],
   [enable_vec="$enableval"],
   [enable_vec="yes"]
)

#  Disable hand written vectorisation. Slightly odd implementation as want
# to describe as --disable-hand-vec, but macro is enable (there is no enable action).
AC_ARG_ENABLE([hand-vec],
   [AS_HELP_STRING([--disable-hand-vec],
     [Disable intrinsic vectorization]
   )],
   [enable_hand_vec="$enableval"],
   [enable_hand_vec="yes"]
)

HAVEVECTORIZATION=0

if test "$enable_opt" = "yes" ; then

   # Choose the best flags for this compiler and architecture
   ac_test_CFLAGS="no"
   AX_CC_MAXOPT
   ac_test_CFLAGS="yes"

   # Choose the best flags for the gravity sub-library on this compiler and architecture
   if test "$ax_cv_c_compiler_vendor" = "intel"; then
      case "$icc_flags" in
      	 *CORE-AVX512*)
            GRAVITY_CFLAGS="$GRAVITY_CFLAGS -qopt-zmm-usage=high"
	    ;;
	 *)
	    AC_MSG_WARN([No additional flags needed for gravity on this platform])
	    ;;
      esac
   elif test "$ax_cv_c_compiler_vendor" = "gnu"; then
      if test "$gcc_handles_avx512" = "yes"; then
         case "$ax_gcc_arch" in
	    *skylake-avx512*)
               GRAVITY_CFLAGS="$GRAVITY_CFLAGS -mprefer-vector-width=512"
	       ;;
	    *)
	       AC_MSG_WARN([No additional flags needed for gravity on this platform])
	       ;;
         esac
      else
         AC_MSG_WARN([No additional flags needed for gravity on this platform])
      fi
   else
      AC_MSG_WARN([Do not know what best gravity vectorization flags to choose for this compiler])
   fi
   AC_ARG_VAR([GRAVITY_CFLAGS], [C compiler flags added to the basic CFLAGS to compile
   				 the gravity-related files.])

   # Check SSE & AVX support (some overlap with AX_CC_MAXOPT).
   # Don't use the SIMD_FLAGS result with Intel compilers. The -x<code>
   # value from AX_CC_MAXOPT should be sufficient.
   AX_EXT
   if test "$SIMD_FLAGS" != ""; then
       if test "$ax_cv_c_compiler_vendor" != "intel"; then
           CFLAGS="$CFLAGS $SIMD_FLAGS"
       fi
   fi

   if test "$enable_vec" = "no"; then
      if test "$ax_cv_c_compiler_vendor" = "intel"; then
      	 CFLAGS="$CFLAGS -no-vec -no-simd"
      	 AC_MSG_RESULT([disabled Intel vectorization])
      elif test "$ax_cv_c_compiler_vendor" = "gnu"; then
      	 CFLAGS="$CFLAGS -fno-tree-vectorize"
      	 AC_MSG_RESULT([disabled GCC vectorization])
      elif test "$ax_cv_c_compiler_vendor" = "clang"; then
         CFLAGS="$CFLAGS -fno-vectorize -fno-slp-vectorize"
         AC_MSG_RESULT([disabled clang vectorization])
      else
         AC_MSG_WARN([Do not know how to disable vectorization for this compiler])
      fi
   elif test "$enable_hand_vec" = "yes"; then
      AC_DEFINE([WITH_VECTORIZATION],1,[Enable hand-written vectorization])
      HAVEVECTORIZATION=1
   fi
fi
AM_CONDITIONAL([HAVEVECTORIZATION],[test -n "$HAVEVECTORIZATION"])


# Add address sanitizer options to flags, if requested. Only useful for GCC
# version 4.8 and later and clang.
AC_ARG_ENABLE([sanitizer],
   [AS_HELP_STRING([--enable-sanitizer],
     [Enable memory error detection using address sanitizer @<:@no/yes@:>@]
   )],
   [enable_san="$enableval"],
   [enable_san="no"]
)

if test "$enable_san" = "yes"; then
   if test "$ax_cv_c_compiler_vendor" = "gnu"; then
      AX_COMPARE_VERSION( $ax_cv_c_compiler_version, [ge], [4.8.0],
                          [enable_san="yes"], [enable_san="no"] )
   elif test "$ax_cv_c_compiler_vendor" = "clang"; then
      AX_COMPARE_VERSION( $ax_cv_c_compiler_version, [ge], [3.2.0],
                          [enable_san="yes"], [enable_san="no"] )
   fi
   if test "$enable_san" = "yes"; then
      CFLAGS="$CFLAGS -fsanitize=address -fno-omit-frame-pointer"
      AC_MSG_RESULT([added address sanitizer support])
   else
      AC_MSG_WARN([Compiler does not support address sanitizer option])
   fi
fi

# Add the undefined sanitizer option to flags. Only useful for GCC
# version 4.9 and later and clang to detected undefined code behaviour
# such as integer overflow and memory alignment issues.
AC_ARG_ENABLE([undefined-sanitizer],
   [AS_HELP_STRING([--enable-undefined-sanitizer],
     [Enable detection of code that causes undefined behaviour @<:@no/yes@:>@]
   )],
   [enable_ubsan="$enableval"],
   [enable_ubsan="no"]
)

if test "$enable_ubsan" = "yes"; then
   if test "$ax_cv_c_compiler_vendor" = "gnu"; then
      AX_COMPARE_VERSION( $ax_cv_c_compiler_version, [ge], [4.9.0],
                          [enable_ubsan="yes"], [enable_ubsan="no"] )
   elif test "$ax_cv_c_compiler_vendor" = "clang"; then
      AX_COMPARE_VERSION( $ax_cv_c_compiler_version, [ge], [3.7.0],
                          [enable_ubsan="yes"], [enable_ubsan="no"] )
   fi
   if test "$enable_ubsan" = "yes"; then
      CFLAGS="$CFLAGS -fsanitize=undefined"
      AC_MSG_RESULT([added undefined sanitizer support])
   else
      AC_MSG_WARN([Compiler does not support undefined sanitizer option])
   fi
fi

# Autoconf stuff.
AC_PROG_INSTALL
AC_PROG_MAKE_SET
AC_HEADER_STDC

# Check for the libraries we will need.
AC_CHECK_LIB(m,sqrt,,AC_MSG_ERROR(something is wrong with the math library!))

# Check for GSL. We test for this in the standard directories by default,
# and only disable if using --with-gsl=no or --without-gsl. When a value
# is given GSL must be found.
have_gsl="no"
AC_ARG_WITH([gsl],
    [AS_HELP_STRING([--with-gsl=PATH],
       [root directory where GSL is installed @<:@yes/no@:>@]
    )],
    [with_gsl="$withval"],
    [with_gsl="test"]
)
if test "x$with_gsl" != "xno"; then
   if test "x$with_gsl" != "xyes" -a "x$with_gsl" != "xtest" -a "x$with_gsl" != "x"; then
      GSL_LIBS="-L$with_gsl/lib -lgsl -lgslcblas"
      GSL_INCS="-I$with_gsl/include"
   else
      GSL_LIBS="-lgsl -lgslcblas"
      GSL_INCS=""
   fi
   #  GSL is not specified, so just check if we have it.
   if test "x$with_gsl" = "xtest"; then
      AC_CHECK_LIB([gslcblas],[cblas_dgemm],[have_gsl="yes"],[have_gsl="no"],$GSL_LIBS)
      if test "x$have_gsl" != "xno"; then
         AC_DEFINE([HAVE_LIBGSLCBLAS],1,[The GSL CBLAS library appears to be present.])
         AC_CHECK_LIB([gsl],[gsl_integration_qag],
            AC_DEFINE([HAVE_LIBGSL],1,[The GSL library appears to be present.]),
            [have_gsl="no"],$GSL_LIBS)
      fi
   else
      AC_CHECK_LIB([gslcblas],[cblas_dgemm],
         AC_DEFINE([HAVE_LIBGSLCBLAS],1,[The GSL CBLAS library appears to be present.]),
         AC_MSG_ERROR(something is wrong with the GSL CBLAS library!), $GSL_LIBS)
      AC_CHECK_LIB([gsl],[gsl_integration_qag],
         AC_DEFINE([HAVE_LIBGSL],1,[The GSL library appears to be present.]),
         AC_MSG_ERROR(something is wrong with the GSL library!), $GSL_LIBS)
      have_gsl="yes"
   fi
   if test "$have_gsl" = "no"; then
      GSL_LIBS=""
      GSL_INCS=""
   fi
fi
AC_SUBST([GSL_LIBS])
AC_SUBST([GSL_INCS])
AM_CONDITIONAL([HAVEGSL],[test -n "$GSL_LIBS"])

# Check for pthreads.
AX_PTHREAD([LIBS="$PTHREAD_LIBS $LIBS" CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
    CC="$PTHREAD_CC" LDFLAGS="$LDFLAGS $PTHREAD_LIBS $LIBS"],
    AC_MSG_ERROR([Could not find a working version of
    the pthread library. Make sure you have the library and header files installed
    or use CPPFLAGS and LDFLAGS if the library is installed in a
    non-standard location.]))

# Check whether POSIX thread barriers are implemented (e.g. OSX does not have them)
have_pthread_barrier="no"
AC_CHECK_LIB(pthread, pthread_barrier_init,
	     have_pthread_barrier="yes",
	     AC_MSG_WARN(POSIX implementation does not have barriers. SWIFT will use home-made ones.))
if test "x$have_pthread_barrier" == "xyes"; then
  AC_DEFINE([HAVE_PTHREAD_BARRIERS], [1], [The posix library implements barriers])
fi

# Check whether POSIX file allocation functions exist (e.g. OSX does not have them)
AC_CHECK_LIB(pthread, posix_fallocate,
	     AC_DEFINE([HAVE_POSIX_FALLOCATE], [1], [The posix library implements file allocation functions.]),
	     AC_MSG_WARN(POSIX implementation does not have file allocation functions.))

# Check for METIS.
have_metis="no"
AC_ARG_WITH([metis],
    [AS_HELP_STRING([--with-metis=PATH],
       [root directory where METIS is installed @<:@yes/no@:>@]
    )],
    [with_metis="$withval"],
    [with_metis="no"]
)

METIS_LIBS=""
if test "x$with_metis" != "xno"; then

# Check if we have METIS.
   if test "x$with_metis" != "xyes" -a "x$with_metis" != "x"; then
      METIS_LIBS="-L$with_metis/lib -lmetis"
      METIS_INCS="-I$with_metis/include"
   else
      METIS_LIBS="-lmetis"
      METIS_INCS=""
   fi
   AC_CHECK_LIB([metis],[METIS_PartGraphKway], [have_metis="yes"],
                [have_metis="no"], $METIS_LIBS)
   if test "$have_metis" == "yes"; then
      AC_DEFINE([HAVE_METIS],1,[The METIS library is present.])
   else
      AC_MSG_ERROR("Failed to find a METIS library")
   fi
fi

AC_SUBST([METIS_LIBS])
AC_SUBST([METIS_INCS])
AM_CONDITIONAL([HAVEMETIS],[test -n "$METIS_LIBS"])

# Check for ParMETIS note we can have both as ParMETIS uses METIS.
have_parmetis="no"
AC_ARG_WITH([parmetis],
    [AS_HELP_STRING([--with-parmetis=PATH],
       [root directory where ParMETIS is installed @<:@yes/no@:>@]
    )],
    [with_parmetis="$withval"],
    [with_parmetis="no"]
)

if test "x$with_parmetis" != "xno"; then

# Check if we have ParMETIS.
   if test "x$with_parmetis" != "xyes" -a "x$with_parmetis" != "x"; then
      PARMETIS_LIBS="-L$with_parmetis/lib -lparmetis"
      PARMETIS_INCS="-I$with_parmetis/include"
   else
      PARMETIS_LIBS="-lparmetis"
      PARMETIS_INCS=""
   fi
   AC_CHECK_LIB([parmetis],[ParMETIS_V3_RefineKway], [have_parmetis="yes"],
                [have_parmetis="no"], $PARMETIS_LIBS)
   if test "$have_parmetis" == "no"; then

# A build may use an external METIS library, check for that.

      if test "x$with_parmetis" != "xyes" -a "x$with_parmetis" != "x"; then
         PARMETIS_LIBS="-L$with_parmetis/lib -lparmetis -lmetis"
         PARMETIS_INCS="-I$with_parmetis/include"
      else
         PARMETIS_LIBS="-lparmetis -lmetis"
         PARMETIS_INCS=""
      fi
      # Note use different function to avoid caching of first check.
      AC_CHECK_LIB([parmetis],[ParMETIS_V3_PartKway], [have_parmetis="yes"],
                   [have_parmetis="no"], [$METIS_LIBS $PARMETIS_LIBS])

   fi
   if test "$have_parmetis" == "yes"; then
      AC_DEFINE([HAVE_PARMETIS],1,[The ParMETIS library is present.])
   else
      AC_MSG_ERROR("Failed to find a ParMETIS library")
   fi
fi

AC_SUBST([PARMETIS_LIBS])
AC_SUBST([PARMETIS_INCS])
AM_CONDITIONAL([HAVEPARMETIS],[test -n "$PARMETIS_LIBS"])

# METIS fixed width integer printing can require this, so define. Only needed
# for some non C99 compilers, i.e. C++ pre C++11.
AH_VERBATIM([__STDC_FORMAT_MACROS],
            [/* Needed to get PRIxxx macros from stdint.h when not using C99 */
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS 1
#endif])

# Check for FFTW. We test for this in the standard directories by default,
# and only disable if using --with-fftw=no or --without-fftw. When a value
# is given FFTW must be found.
# If FFTW is found, we check whether this is the threaded version.
have_fftw="no"
AC_ARG_WITH([fftw],
    [AS_HELP_STRING([--with-fftw=PATH],
       [root directory where fftw is installed @<:@yes/no@:>@]
    )],
    [with_fftw="$withval"],
    [with_fftw="test"]
)
if test "x$with_fftw" != "xno"; then

   # Was FFTW's location specifically given?
   if test "x$with_fftw" != "xyes" -a "x$with_fftw" != "xtest" -a "x$with_fftw" != "x"; then
      FFTW_LIBS="-L$with_fftw/lib -lfftw3"
      FFTW_INCS="-I$with_fftw/include"
   else
      FFTW_LIBS="-lfftw3"
      FFTW_INCS=""
   fi

   #  FFTW is not specified, so just check if we have it.
   if test "x$with_fftw" = "xtest"; then
      AC_CHECK_LIB([fftw3],[fftw_malloc],[have_fftw="yes"],[have_fftw="no"],$FFTW_LIBS)
      if test "x$have_fftw" != "xno"; then
      	 AC_DEFINE([HAVE_FFTW],1,[The FFTW library appears to be present.])
      fi
   # FFTW was specified, check that it was a valid location.
   else
      AC_CHECK_LIB([fftw3],[fftw_malloc],
         AC_DEFINE([HAVE_FFTW],1,[The FFTW library appears to be present.]),
         AC_MSG_ERROR(something is wrong with the FFTW library!), $FFTW_LIBS)
      have_fftw="yes"
   fi

   # FFTW was requested not to be used.
   if test "$have_fftw" = "no"; then
      FFTW_LIBS=""
      FFTW_INCS=""
   fi

   # Now, check whether we have the threaded version of FFTW
   if test "x$have_fftw" = "xyes"; then

      # Was FFTW's location specifically given?
      if test "x$with_fftw" != "xyes" -a "x$with_fftw" != "xtest" -a "x$with_fftw" != "x"; then
        FFTW_THREADED_LIBS="-L$with_fftw/lib -lfftw3_threads -lfftw3"
        FFTW_THREADED_INCS="-I$with_fftw/include"
      else
        FFTW_THREADED_LIBS="-lfftw3_threads -lfftw3"
        FFTW_THREADED_INCS=""
      fi

      # Verify that the library is threaded
      AC_CHECK_LIB([fftw3],[fftw_init_threads],[have_threaded_fftw="yes"],
		   [have_threaded_fftw="no"], $FFTW_THREADED_LIBS)

      # If found, update things
      if test "x$have_threaded_fftw" = "xyes"; then
         AC_DEFINE([HAVE_THREADED_FFTW],1,[The threaded FFTW library appears to be present.])
         FFTW_LIBS=$FFTW_THREADED_LIBS
         FFTW_INCS=$FFTW_THREADED_INCS
	 have_fftw="yes - threaded"
      fi
   fi
fi

AC_ARG_WITH([arm-fftw],
    [AS_HELP_STRING([--with-arm-fftw=PATH],
      [root directory where arm fft library is installed @<:@yes/no@:>@]
    )],
    [with_arm_fftw="$withval"],
    [with_arm_fftw=no]
)
if test "x$with_arm_fftw" != "xno"; then

   # Was FFTW's location specifically given?
   if test "x$with_arm_fftw" != "xyes" -a "x$with_arm_fftw" != "xtest" -a "x$with_arm_fftw" != "x"; then
      FFTW_LIBS="-L$with_arm_fftw/lib -larmpl_lp64"
      FFTW_INCS="-I$with_arm_fftw/include"
   else
      FFTW_LIBS="-larmpl_lp64"
      FFTW_INCS=""
   fi

   #  FFTW is not specified, so just check if we have it.
   if test "x$with_arm_fftw" = "xtest"; then
      AC_CHECK_LIB([armpl_lp64],[fftw_malloc],[have_fftw="yes"],[have_fftw="no"],$FFTW_LIBS)
      if test "x$have_arm_fftw" != "xno"; then
      	 AC_DEFINE([HAVE_FFTW],1,[The FFTW library appears to be present.])
	 have_fftw="yes - ARM"
      fi
   # FFTW was specified, check that it was a valid location.
   else
      AC_CHECK_LIB([armpl_lp64],[fftw_malloc],
         AC_DEFINE([HAVE_FFTW],1,[The FFTW library appears to be present.]),
         AC_MSG_ERROR(something is wrong with the FFTW library!), $FFTW_LIBS)
      have_fftw="yes - ARM"
   fi

   # FFTW was requested not to be used.
   if test "$have_arm_fftw" = "no"; then
      FFTW_LIBS=""
      FFTW_INCS=""
   fi

   # Now, check whether we have the threaded version of FFTW
   if test "x$have_arm_fftw" = "xyes"; then

      # Was FFTW's location specifically given?
      if test "x$with_arm_fftw" != "xyes" -a "x$with_arm_fftw" != "xtest" -a "x$with_arm_fftw" != "x"; then
        FFTW_THREADED_LIBS="-L$with_arm_fftw/lib -larmpl_lp64_threads -larmpl_lp64"
        FFTW_THREADED_INCS="-I$with_arm_fftw/include"
      else
        FFTW_THREADED_LIBS="-larmpl_lp64_threads -larmpl_lp64"
        FFTW_THREADED_INCS=""
      fi

      # Verify that the library is threaded
      AC_CHECK_LIB([armpl_lp64],[fftw_init_threads],[have_threaded_fftw="yes"],
                  [have_threaded_fftw="no"], $FFTW_THREADED_LIBS)

      # If found, update things
      if test "x$have_threaded_fftw" = "xyes"; then
         AC_DEFINE([HAVE_THREADED_FFTW],1,[The threaded FFTW library appears to be present.])
         FFTW_LIBS=$FFTW_THREADED_LIBS
         FFTW_INCS=$FFTW_THREADED_INCS
         have_fftw="yes - ARM - threaded"
      fi
   fi
fi
AC_SUBST([FFTW_LIBS])
AC_SUBST([FFTW_INCS])
AM_CONDITIONAL([HAVEFFTW],[test -n "$FFTW_LIBS"])

#  Check for -lprofiler usually part of the gperftools along with tcmalloc.
have_profiler="no"
AC_ARG_WITH([profiler],
   [AS_HELP_STRING([--with-profiler=PATH],
      [use cpu profiler library or specify the directory with lib @<:@yes/no@:>@]
   )],
   [with_profiler="$withval"],
   [with_profiler="no"]
)
if test "x$with_profiler" != "xno"; then
   if test "x$with_profiler" != "xyes" -a "x$with_profiler" != "x"; then
      proflibs="-L$with_profiler -lprofiler"
   else
      proflibs="-lprofiler"
   fi
   AC_CHECK_LIB([profiler],[ProfilerFlush],
    [have_profiler="yes"
      AC_DEFINE([WITH_PROFILER],1,[Link against the gperftools profiling library.])],
    [have_profiler="no"], $proflibs)

   if test "$have_profiler" = "yes"; then
      PROFILER_LIBS="$proflibs"
   else
      PROFILER_LIBS=""
   fi
fi
AC_SUBST([PROFILER_LIBS])
AM_CONDITIONAL([HAVEPROFILER],[test -n "$PROFILER_LIBS"])

# Check for special allocators
have_special_allocator="no"

#  Check for tcmalloc a fast malloc that is part of the gperftools.
have_tcmalloc="no"
AC_ARG_WITH([tcmalloc],
   [AS_HELP_STRING([--with-tcmalloc=PATH],
      [use tcmalloc library or specify the directory with lib @<:@yes/no@:>@]
   )],
   [with_tcmalloc="$withval"],
   [with_tcmalloc="no"]
)
if test "x$with_tcmalloc" != "xno" -a "x$have_special_allocator" != "xno"; then
   AC_MSG_ERROR("Cannot activate more than one alternative malloc library")
fi

if test "x$with_tcmalloc" != "xno"; then
   if test "x$with_tcmalloc" != "xyes" -a "x$with_tcmalloc" != "x"; then
      tclibs="-L$with_tcmalloc -ltcmalloc"
   else
      tclibs="-ltcmalloc"
   fi
   AC_CHECK_LIB([tcmalloc],[tc_cfree],[have_tcmalloc="yes"],[have_tcmalloc="no"],
                $tclibs)

   #  Could just have the minimal version.
   if test "$have_tcmalloc" = "no"; then
      if test "x$with_tcmalloc" != "xyes" -a "x$with_tcmalloc" != "x"; then
         tclibs="-L$with_tcmalloc -ltcmalloc_minimal"
      else
         tclibs="-ltcmalloc_minimal"
      fi
      AC_CHECK_LIB([tcmalloc],[tc_cfree],[have_tcmalloc="yes"],[have_tcmalloc="no"],
                   $tclibs)
   fi

   if test "$have_tcmalloc" = "yes"; then
      TCMALLOC_LIBS="$tclibs"

      AC_DEFINE([HAVE_TCMALLOC],1,[The tcmalloc library appears to be present.])

      have_special_allocator="tcmalloc"

      # Prevent compilers that replace the calls with built-ins (GNU 99) from doing so.
      case "$ax_cv_c_compiler_vendor" in
        intel | gnu | clang)
             CFLAGS="$CFLAGS -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free"
          ;;
      esac

   else
      TCMALLOC_LIBS=""
   fi
fi
AC_SUBST([TCMALLOC_LIBS])
AM_CONDITIONAL([HAVETCMALLOC],[test -n "$TCMALLOC_LIBS"])

#  Check for jemalloc another fast malloc that is good with contention.
have_jemalloc="no"
AC_ARG_WITH([jemalloc],
   [AS_HELP_STRING([--with-jemalloc=PATH],
      [use jemalloc library or specify the directory with lib @<:@yes/no@:>@]
   )],
   [with_jemalloc="$withval"],
   [with_jemalloc="no"]
)
if test "x$with_jemalloc" != "xno" -a "x$have_special_allocator" != "xno"; then
   AC_MSG_ERROR("Cannot activate more than one alternative malloc library")
fi

if test "x$with_jemalloc" != "xno"; then
   if test "x$with_jemalloc" != "xyes" -a "x$with_jemalloc" != "x"; then
      jelibs="-L$with_jemalloc -ljemalloc"
   else
      jelibs="-ljemalloc"
   fi