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# Process this file with autoconf to produce a configure script, like so:

# aclocal -I ../config && autoconf && autoheader && automake

AC_PREREQ(2.59)

AC_INIT([GNU OpenMP Runtime Library], 1.0,,[libgomp])

AC_CONFIG_HEADER(config.h)

# -------

# Options

# -------

AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])

LIBGOMP_ENABLE(version-specific-runtime-libs, no, ,

   [Specify that runtime libraries should be installed in a compiler-specific directory],

   permit yes|no)

AC_MSG_RESULT($enable_version_specific_runtime_libs)

AC_MSG_CHECKING([for --enable-linux-futex])

LIBGOMP_ENABLE(linux-futex, default, ,

  [Use the Linux futex system call],

  permit yes|no|default)

AC_MSG_RESULT($enable_linux_futex)

# We would like our source tree to be readonly. However when releases or

# pre-releases are generated, the flex/bison generated files as well as the

# various formats of manuals need to be included along with the rest of the

# sources.  Therefore we have --enable-generated-files-in-srcdir to do

# just that.

AC_MSG_CHECKING([for --enable-generated-files-in-srcdir])

LIBGOMP_ENABLE(generated-files-in-srcdir, no, ,

   [put copies of generated files in source dir intended for creating source

    tarballs for users without texinfo bison or flex.],

   permit yes|no)

AC_MSG_RESULT($enable_generated_files_in_srcdir)

AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes)

# -------

# -------

# Gets build, host, target, *_vendor, *_cpu, *_os, etc.

#

# You will slowly go insane if you do not grok the following fact:  when

# building this library, the top-level /target/ becomes the library's /host/.

#

# configure then causes --target to default to --host, exactly like any

# other package using autoconf.  Therefore, 'target' and 'host' will

# always be the same.  This makes sense both for native and cross compilers

# just think about it for a little while.  :-)

#

# Also, if this library is being configured as part of a cross compiler, the

# top-level configure script will pass the "real" host as $with_cross_host.

#

# Do not delete or change the following two lines.  For why, see

# http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html

AC_CANONICAL_SYSTEM

target_alias=${target_alias-$host_alias}

# Sets up automake.  Must come after AC_CANONICAL_SYSTEM.  Each of the

# following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.

#  1.9.0:  minimum required version

#  no-define:  PACKAGE and VERSION will not be #define'd in config.h (a bunch

#              of other PACKAGE_* variables will, however, and there's nothing

#              we can do about that; they come from AC_INIT).

#  foreign:  we don't follow the normal rules for GNU packages (no COPYING

#            file in the top srcdir, etc, etc), so stop complaining.

#  no-dependencies:  turns off auto dependency generation (just for now)

#  -Wall:  turns on all automake warnings...

#  -Wno-portability:  ...except this one, since GNU make is required.

#  -Wno-override: ... and this one, since we do want this in testsuite.

AM_INIT_AUTOMAKE([1.9.0 foreign -Wall -Wno-portability -Wno-override])

AM_ENABLE_MULTILIB(, ..)

# Calculate toolexeclibdir

# Also toolexecdir, though it's only used in toolexeclibdir

case ${enable_version_specific_runtime_libs} in

  yes)

    # Need the gcc compiler version to know where to install libraries

    # and header files if --enable-version-specific-runtime-libs option

    # is selected.

    toolexecdir='$(libdir)/gcc/$(target_alias)'

    toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'

    ;;

  no)

    if test -n "$with_cross_host" &&

       test x"$with_cross_host" != x"no"; then

      # Install a library built with a cross compiler in tooldir, not libdir.

      toolexecdir='$(exec_prefix)/$(target_alias)'

      toolexeclibdir='$(toolexecdir)/lib'

    else

      toolexecdir='$(libdir)/gcc-lib/$(target_alias)'

      toolexeclibdir='$(libdir)'

    fi

    multi_os_directory=`$CC -print-multi-os-directory`

    case $multi_os_directory in

      .) ;; # Avoid trailing /.

      *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;

    esac

    ;;

esac

AC_SUBST(toolexecdir)

AC_SUBST(toolexeclibdir)

# Check the compiler.

# The same as in boehm-gc and libstdc++. Have to borrow it from there.

# We must force CC to /not/ be precious variables; otherwise

# the wrong, non-multilib-adjusted value will be used in multilibs.

# As a side effect, we have to subst CFLAGS ourselves.

m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])

m4_define([_AC_ARG_VAR_PRECIOUS],[])

AC_PROG_CC

m4_rename([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])

AC_SUBST(CFLAGS)

# In order to override CFLAGS_FOR_TARGET, all of our special flags go

# in XCFLAGS.  But we need them in CFLAGS during configury.  So put them

# in both places for now and restore CFLAGS at the end of config.

save_CFLAGS="$CFLAGS"

# Add -Wall -Werror if we are using GCC.

if test "x$GCC" = "xyes"; then

  XCFLAGS="$XCFLAGS -Wall -Werror"

fi

# Find other programs we need.

AC_CHECK_TOOL(AR, ar)

AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)

AC_PATH_PROG(PERL, perl, perl-not-found-in-path-error)

AC_PROG_MAKE_SET

AC_PROG_INSTALL

# See if makeinfo has been installed and is modern enough

# that we can use it.

ACX_CHECK_PROG_VER([MAKEINFO], [makeinfo], [--version],

                   [GNU texinfo.* \([0-9][0-9.]*\)],

                   [4.[4-9]*])

AM_CONDITIONAL(BUILD_INFO, test $gcc_cv_prog_makeinfo_modern = "yes")

# Configure libtool

AM_PROG_LIBTOOL

AC_SUBST(enable_shared)

AC_SUBST(enable_static)

AM_MAINTAINER_MODE

# We need gfortran to compile parts of the library

# We can't use AC_PROG_FC because it expects a fully working gfortran.

#AC_PROG_FC(gfortran)

FC="$GFORTRAN"

AC_PROG_FC(gfortran)

FCFLAGS="$FCFLAGS -Wall"

# For libtool versioning info, format is CURRENT:REVISION:AGE

libtool_VERSION=1:0:0

AC_SUBST(libtool_VERSION)

# Check header files.

AC_STDC_HEADERS

AC_HEADER_TIME

AC_CHECK_HEADERS(unistd.h semaphore.h sys/loadavg.h sys/time.h)

GCC_HEADER_STDINT(gstdint.h)

# Check to see if -pthread or -lpthread is needed.  Prefer the former.

# In case the pthread.h system header is not found, this test will fail.

XPCFLAGS=""

CFLAGS="$CFLAGS -pthread"

AC_LINK_IFELSE(

 [AC_LANG_PROGRAM(

  [#include 

   void *g(void *d) { return NULL; }],

  [pthread_t t; pthread_create(&t,NULL,g,NULL);])],

 [XPCFLAGS=" -Wc,-pthread"],

 [CFLAGS="$save_CFLAGS" LIBS="-lpthread $LIBS"

  AC_LINK_IFELSE(

   [AC_LANG_PROGRAM(

    [#include 

     void *g(void *d) { return NULL; }],

    [pthread_t t; pthread_create(&t,NULL,g,NULL);])],

   [],

   [AC_MSG_ERROR([Pthreads are required to build libgomp])])])

# Check for functions needed.

AC_CHECK_FUNCS(getloadavg clock_gettime)

# Check for broken semaphore implementation on darwin.

# sem_init returns: sem_init error: Function not implemented.

case "$host" in

  *-darwin*)

    AC_DEFINE(HAVE_BROKEN_POSIX_SEMAPHORES, 1,

        Define if the POSIX Semaphores do not work on your system.)

    ;;

  *-linux*)

    case "$enable_linux_futex" in

      default)

        # If headers don't have gettid/futex syscalls definition, then

        # default to no, otherwise there will be compile time failures.

        # Otherwise, default to yes.  If we don't detect we are

        # compiled/linked against NPTL and not cross-compiling, check

        # if programs are run by default against NPTL and if not, issue

        # a warning.

        enable_linux_futex=no

        AC_LINK_IFELSE(

         [AC_LANG_PROGRAM(

          [#include 

           int lk;],

          [syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],

          [AC_LINK_IFELSE(

           [AC_LANG_PROGRAM(

            [#ifndef _GNU_SOURCE

             #define _GNU_SOURCE 1

             #endif

             #include 

             pthread_t th; void *status;],

            [pthread_tryjoin_np (th, &status);])],[enable_linux_futex=yes],

            [if test x$cross_compiling = xno; then

               if getconf GNU_LIBPTHREAD_VERSION 2>/dev/null \

                  | LC_ALL=C grep -i NPTL > /dev/null 2>/dev/null; then

                 AC_MSG_WARN([The kernel might not support futex or gettid syscalls.

If so, please configure with --disable-linux-futex])

               fi

             fi

             enable_linux_futex=yes])])

        ;;

      yes)

        AC_LINK_IFELSE(

         [AC_LANG_PROGRAM(

          [#include 

           int lk;],

          [syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],[],

          [AC_MSG_ERROR([SYS_gettid and SYS_futex required for --enable-linux-futex])])

        ;;

    esac

    ;;

esac

# At least for glibc, clock_gettime is in librt.  But don't pull that

# in if it still doesn't give us the function we want.

if test $ac_cv_func_clock_gettime = no; then

  AC_CHECK_LIB(rt, clock_gettime,

    [LIBS="-lrt $LIBS"

     AC_DEFINE(HAVE_CLOCK_GETTIME, 1,

               [Define to 1 if you have the `clock_gettime' function.])])

fi

# See if we support thread-local storage.

GCC_CHECK_TLS

# See what sort of export controls are availible.

LIBGOMP_CHECK_ATTRIBUTE_VISIBILITY

LIBGOMP_CHECK_ATTRIBUTE_DLLEXPORT

LIBGOMP_CHECK_ATTRIBUTE_ALIAS

LIBGOMP_ENABLE_SYMVERS

# Get target configury.

. ${srcdir}/configure.tgt

CFLAGS="$save_CFLAGS $XCFLAGS"

# Check for __sync_val_compare_and_swap, but only after the target has

# had a chance to set XCFLAGS.

LIBGOMP_CHECK_SYNC_BUILTINS

XCFLAGS="$XCFLAGS$XPCFLAGS"

AC_SUBST(config_path)

AC_SUBST(XCFLAGS)

AC_SUBST(XLDFLAGS)

# Cleanup and exit.

CFLAGS="$save_CFLAGS"

AC_CACHE_SAVE

if test ${multilib} = yes; then

  multilib_arg="--enable-multilib"

else

  multilib_arg=

fi

# Set up the set of libraries that we need to link against for libgomp.

# Note that the GOMP_SELF_SPEC in gcc.c will force -pthread for -fopenmp,

# which will force linkage against -lpthread (or equivalent for the system).

# That's not 100% ideal, but about the best we can do easily.

if test $enable_shared = yes; then

  link_gomp="-lgomp %{static: $LIBS}"

else

  link_gomp="-lgomp $LIBS"

fi

AC_SUBST(link_gomp)

AM_CONDITIONAL([USE_FORTRAN], [test "$ac_cv_fc_compiler_gnu" = yes])

# ??? 2006-01-24: Paulo committed to asking autoconf folk to document

# and export AC_COMPUTE_INT.  If that happens, then we'll need to remove

# the underscore here and update the PREREQ.  If it doesn't, then we'll

# need to copy this macro to our acinclude.m4.

save_CFLAGS="$CFLAGS"

for i in $config_path; do

  if test -f $srcdir/config/$i/omp-lock.h; then

    CFLAGS="$CFLAGS -include $srcdir/config/$i/omp-lock.h"

    break

  fi

done

_AC_COMPUTE_INT([sizeof (omp_lock_t)], [OMP_LOCK_SIZE],,

  [AC_MSG_ERROR([unsupported system, cannot find sizeof (omp_lock_t)])])

_AC_COMPUTE_INT([__alignof (omp_lock_t)], [OMP_LOCK_ALIGN])

_AC_COMPUTE_INT([sizeof (omp_nest_lock_t)], [OMP_NEST_LOCK_SIZE])

_AC_COMPUTE_INT([__alignof (omp_nest_lock_t)], [OMP_NEST_LOCK_ALIGN])

# If the lock fits in an integer, then arrange for Fortran to use that

# integer.  If it doesn't, then arrange for Fortran to use a pointer.

# Except that we don't have a way at present to multi-lib the installed

# Fortran modules, so we assume 8 bytes for pointers, regardless of the

# actual target.

OMP_LOCK_KIND=$OMP_LOCK_SIZE

OMP_NEST_LOCK_KIND=$OMP_NEST_LOCK_SIZE

if test $OMP_LOCK_SIZE -gt 8 || test $OMP_LOCK_ALIGN -gt $OMP_LOCK_SIZE; then

  OMP_LOCK_KIND=8

fi

if test $OMP_NEST_LOCK_SIZE -gt 8 || test $OMP_NEST_LOCK_ALIGN -gt $OMP_NEST_LOCK_SIZE; then

  OMP_NEST_LOCK_KIND=8

fi

AC_SUBST(OMP_LOCK_SIZE)

AC_SUBST(OMP_LOCK_ALIGN)

AC_SUBST(OMP_NEST_LOCK_SIZE)

AC_SUBST(OMP_NEST_LOCK_ALIGN)

AC_SUBST(OMP_LOCK_KIND)

AC_SUBST(OMP_NEST_LOCK_KIND)

CFLAGS="$save_CFLAGS"

AC_CONFIG_FILES(omp.h omp_lib.h omp_lib.f90 libgomp_f.h)

AC_CONFIG_FILES(Makefile testsuite/Makefile libgomp.spec)

AC_OUTPUT