libgomp/configure.ac - rust-lang/gcc - Git at Google


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

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


            AC_INIT([GNU Offloading and Multi Processing 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)


            # 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-dist:  we don't want 'dist' and related rules.

            
            #  -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 no-dist -Wall -Wno-portability -Wno-override])

            
            AM_ENABLE_MULTILIB(, ..)


            GCC_WITH_TOOLEXECLIBDIR


            # 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)'

            
                  case ${with_toolexeclibdir} in

            
            	no)

            
            	  toolexeclibdir='$(toolexecdir)/lib'

            
            	  ;;

            
            	*)

            
            	  toolexeclibdir=${with_toolexeclibdir}

            
            	  ;;

            
                  esac

            
                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_force([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"


            AC_ARG_ENABLE([werror],

            
              [AS_HELP_STRING([--disable-werror], [disable building with -Werror])])

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

            
            AS_IF([test "x$GCC" = "xyes"],

            
              [XCFLAGS="$XCFLAGS -Wall"])

            
            AS_IF([test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"],

            
              [XCFLAGS="$XCFLAGS -Werror"])


            # Find other programs we need.

            
            AC_CHECK_TOOL(AR, ar)

            
            AC_CHECK_TOOL(RANLIB, ranlib, ranlib-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]*|4.[1-9][0-9]*|[5-9]*|[1-9][0-9]*])

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


            # Configure libtool

            
            LT_INIT

            
            ACX_LT_HOST_FLAGS

            
            AC_SUBST(enable_shared)

            
            AC_SUBST(enable_static)

            
            AM_CONDITIONAL([ENABLE_DARWIN_AT_RPATH], [test x$enable_darwin_at_rpath = xyes])


            AM_MAINTAINER_MODE


            # Create a spec file, so that compile/link tests don't fail

            
            test -f libgfortran.spec || touch libgfortran.spec

            
            FCFLAGS="$FCFLAGS -L."


            # 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)

            
            case `echo $GFORTRAN` in

            
              -* | no* )

            
                FC=no ;;

            
              *)

            
                set dummy $GFORTRAN; ac_word=$2

            
                if test -x "$ac_word"; then

            
                  FC="$GFORTRAN"

            
                else

            
                  FC=no

            
                fi ;;

            
            esac

            
            AC_PROG_FC(gfortran)

            
            FCFLAGS="$FCFLAGS -Wall -L../libgfortran"


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

            
            libtool_VERSION=1:0:0

            
            AC_SUBST(libtool_VERSION)


            # Check header files.

            
            AC_HEADER_STDC

            
            AC_HEADER_TIME

            
            ACX_HEADER_STRING

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


            XPCFLAGS=""

            
            case "$host" in

            
              *-*-rtems*)

            
                # RTEMS supports Pthreads, but the library is not available at GCC build time.

            
                ;;

            
              nvptx*-*-* | amdgcn*-*-*)

            
                # NVPTX does not support Pthreads, has its own code replacement.

            
                libgomp_use_pthreads=no

            
                # NVPTX is an accelerator-only target

            
                libgomp_offloaded_only=yes

            
                ;;

            
              *)

            
                # 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.

            
                CFLAGS="$CFLAGS -pthread"

            
                AC_LINK_IFELSE(

            
                 [AC_LANG_PROGRAM(

            
                  [#include <pthread.h>

            
                   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 <pthread.h>

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

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

            
                   [],

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

            
            esac


            if test x$libgomp_use_pthreads != xno; then

            
              AC_DEFINE(LIBGOMP_USE_PTHREADS, 1,

            
                        [Define to 1 if libgomp should use POSIX threads.])

            
            fi


            if test x$libgomp_offloaded_only = xyes; then

            
              AC_DEFINE(LIBGOMP_OFFLOADED_ONLY, 1,

            
                        [Define to 1 if building libgomp for an accelerator-only target.])

            
            fi


            if test "x$enable_offload_defaulted" = xyes; then

            
              AC_DEFINE(OFFLOAD_DEFAULTED, 1,

            
                [Define to 1 to if -foffload is defaulted])

            
            fi


            AC_CHECK_SIZEOF([void *])


            m4_include([plugin/configfrag.ac])


            if test x"$offload_plugins" != x; then

            
              AC_DEFINE(LIBGOMP_OFFLOAD_HOST, 1,

            
                [Define to 1 if building libgomp for a offload host])

            
            fi


            # Check for functions needed.

            
            AC_CHECK_FUNCS(getloadavg clock_gettime strtoull)

            
            AC_CHECK_FUNCS(aligned_alloc posix_memalign memalign _aligned_malloc)


            # 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.)

            
                ;;

            
            esac


            # RTEMS specific checks

            
            case "$host" in

            
              *-*-rtems*)

            
                AC_CHECK_TYPES([struct _Mutex_Control],[],[],[#include <sys/lock.h>])

            
                ;;

            
            esac


            GCC_LINUX_FUTEX(:)


            # Check for pthread_{,attr_}[sg]etaffinity_np.

            
            AC_LINK_IFELSE(

            
             [AC_LANG_PROGRAM(

            
              [#define _GNU_SOURCE

            
               #include <pthread.h>],

            
              [cpu_set_t cpuset;

            
               pthread_attr_t attr;

            
               pthread_getaffinity_np (pthread_self (), sizeof (cpu_set_t), &cpuset);

            
               if (CPU_ISSET (0, &cpuset))

            
                 CPU_SET (1, &cpuset);

            
               else

            
                 CPU_ZERO (&cpuset);

            
               pthread_setaffinity_np (pthread_self (), sizeof (cpu_set_t), &cpuset);

            
               pthread_attr_init (&attr);

            
               pthread_attr_getaffinity_np (&attr, sizeof (cpu_set_t), &cpuset);

            
               pthread_attr_setaffinity_np (&attr, sizeof (cpu_set_t), &cpuset);])],

            
              AC_DEFINE(HAVE_PTHREAD_AFFINITY_NP, 1,

            
            [	Define if pthread_{,attr_}{g,s}etaffinity_np is supported.]))


            # 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


            # Check for uname.

            
            AC_COMPILE_IFELSE(

            
             [AC_LANG_PROGRAM(

            
              [#include <string.h>

            
               #include <stdlib.h>

            
               #include <sys/utsname.h>],

            
              [struct utsname buf;

            
               volatile size_t len = 0;

            
               if (!uname (buf))

            
                 len = strlen (buf.nodename);])],

            
              AC_DEFINE(HAVE_UNAME, 1,

            
            [	Define if uname is supported and struct utsname has nodename field.]))


            # Check for gethostname.

            
            AC_COMPILE_IFELSE(

            
             [AC_LANG_PROGRAM(

            
              [#include <unistd.h>],

            
              [

            
            changequote(,)dnl

            
               char buf[256];

            
               if (gethostname (buf, sizeof (buf) - 1) == 0)

            
                 buf[255] = '\0';

            
            changequote([,])dnl

            
              ])],

            
              AC_DEFINE(HAVE_GETHOSTNAME, 1,

            
            [	Define if gethostname is supported.]))


            # Check for getpid.

            
            AC_COMPILE_IFELSE(

            
             [AC_LANG_PROGRAM(

            
              [#include <unistd.h>],

            
              [int pid = getpid ();])],

            
              AC_DEFINE(HAVE_GETPID, 1,

            
            [	Define if getpid is supported.]))


            # See if we support thread-local storage.

            
            GCC_CHECK_TLS


            # See if we have emulated thread-local storage.

            
            GCC_CHECK_EMUTLS


            # See what sort of export controls are available.

            
            GCC_CHECK_ATTRIBUTE_VISIBILITY

            
            LIBGOMP_CHECK_ATTRIBUTE_DLLEXPORT

            
            LIBGOMP_CHECK_ATTRIBUTE_ALIAS

            
            LIBGOMP_ENABLE_SYMVERS


            if test $enable_symvers = gnu; then

            
              AC_DEFINE(LIBGOMP_GNU_SYMBOL_VERSIONING, 1,

            
            	    [Define to 1 if GNU symbol versioning is used for libgomp.])

            
            fi


            # Determine cpu count to limit testsuite parallelism.

            
            AX_COUNT_CPUS

            
            AC_SUBST(CPU_COUNT)


            AC_MSG_NOTICE([checking for flock implementation])

            
            AC_CHECK_PROGS(FLOCK, flock)

            
            # Fallback if 'perl' is available.

            
            if test -z "$FLOCK"; then

            
              # These need to be absolute paths, yet at the same time need to

            
              # canonicalize only relative paths, because then amd will not unmount

            
              # drives. Thus the use of PWDCMD: set it to 'pawd' or 'amq -w' if using amd.

            
              case $srcdir in

            
            changequote(,)dnl

            
                [\\/$]* | ?:[\\/]*) libgomp_abs_srcdir=${srcdir} ;;

            
            changequote([,])dnl

            
                *) libgomp_abs_srcdir=`cd "$srcdir" && ${PWDCMD-pwd} || echo "$srcdir"` ;;

            
              esac

            
              AC_CHECK_PROG(FLOCK, perl, $libgomp_abs_srcdir/testsuite/flock)

            
            fi


            AC_SUBST(SYSROOT_CFLAGS_FOR_TARGET)


            # 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


            # If offloading is enabled, both offload hosts and accelerators are required to support

            
            # __sync_* builtins, to simplify architectural assumptions between both sides

            
            if test x$libgomp_cv_have_sync_builtins = xno; then

            
              # We require accelerator targets to support __sync_* builtins.

            
              if test x$libgomp_offloaded_only = xyes; then

            
                AC_MSG_ERROR([accelerator targets require __sync_val_compare_and_swap to build libgomp.])

            
              fi

            
              # Same for offload hosts.

            
              if test x"$offload_plugins" != x; then

            
                AC_MSG_ERROR([offload hosts require __sync_val_compare_and_swap to build libgomp.])

            
              fi

            
            fi


            XCFLAGS="$XCFLAGS$XPCFLAGS"


            # Add CET specific flags if CET is enabled

            
            GCC_CET_FLAGS(CET_FLAGS)

            
            XCFLAGS="$XCFLAGS $CET_FLAGS"

            
            FCFLAGS="$FCFLAGS $CET_FLAGS"


            AC_SUBST(config_path)

            
            AC_SUBST(XCFLAGS)

            
            AC_SUBST(XLDFLAGS)


            # Conditionalize the makefile for this target machine.

            
            tmake_file_=

            
            for f in ${tmake_file}

            
            do

            
            	if test -f ${srcdir}/config/$f

            
            	then

            
            		tmake_file_="${tmake_file_} \$(srcdir)/config/$f"

            
            	fi

            
            done

            
            tmake_file="${tmake_file_}"

            
            AC_SUBST(tmake_file)


            # 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 may force -pthread,

            
            # 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: $LIBS${DL_LIBS:+ $DL_LIBS}}"

            
            else

            
              link_gomp="-lgomp $LIBS${DL_LIBS:+ $DL_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 confdefs.h -include $srcdir/config/$i/omp-lock.h"

            
                break

            
              fi

            
            done


            AC_COMPUTE_INT([INTPTR_T_KIND], [sizeof (__INTPTR_TYPE__)])

            
            AC_COMPUTE_INT([OMP_INT128_SIZE], [sizeof (__int128)],,[OMP_INT128_SIZE=0])

            
            AC_COMPUTE_INT([OMP_DEPEND_KIND], [2*sizeof (__INTPTR_TYPE__)],,

            
            	       [OMP_DEPEND_KIND=0])

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

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

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

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

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

            
            AC_COMPUTE_INT([OMP_LOCK_25_SIZE], [sizeof (omp_lock_25_t)],,

            
              [AC_MSG_ERROR([unsupported system, cannot find sizeof (omp_lock_25_t)])])

            
            AC_COMPUTE_INT([OMP_LOCK_25_ALIGN], [__alignof (omp_lock_25_t)])

            
            AC_COMPUTE_INT([OMP_NEST_LOCK_25_SIZE], [sizeof (omp_nest_lock_25_t)])

            
            AC_COMPUTE_INT([OMP_NEST_LOCK_25_ALIGN], [__alignof (omp_nest_lock_25_t)])


            # 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

            
            OMP_LOCK_25_KIND=$OMP_LOCK_25_SIZE

            
            OMP_NEST_LOCK_25_KIND=$OMP_NEST_LOCK_25_SIZE

            
            if test $OMP_LOCK_25_SIZE -gt 8 || test $OMP_LOCK_25_ALIGN -gt $OMP_LOCK_25_SIZE; then

            
              OMP_LOCK_25_KIND=8

            
            fi

            
            if test $OMP_NEST_LOCK_25_SIZE -gt 8 || test $OMP_NEST_LOCK_25_ALIGN -gt $OMP_NEST_LOCK_25_SIZE; then

            
              OMP_NEST_LOCK_25_KIND=8

            
            fi

            
            if test "$ac_cv_fc_compiler_gnu" = yes; then

            
              if test $OMP_DEPEND_KIND -eq 16; then

            
                if test $OMP_INT128_SIZE -ne 16; then

            
                  AC_MSG_ERROR([unsupported system, cannot find Fortran int kind=16, needed for omp_depend_kind])

            
                fi

            
              else

            
                if test $OMP_DEPEND_KIND -ne 8; then

            
                  AC_MSG_ERROR([unsupported system, cannot find Fortran integer kind for omp_depend_kind])

            
                fi

            
              fi

            
            fi


            AC_SUBST(INTPTR_T_KIND)

            
            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)

            
            AC_SUBST(OMP_LOCK_25_SIZE)

            
            AC_SUBST(OMP_LOCK_25_ALIGN)

            
            AC_SUBST(OMP_NEST_LOCK_25_SIZE)

            
            AC_SUBST(OMP_NEST_LOCK_25_ALIGN)

            
            AC_SUBST(OMP_LOCK_25_KIND)

            
            AC_SUBST(OMP_NEST_LOCK_25_KIND)

            
            AC_SUBST(OMP_DEPEND_KIND)

            
            CFLAGS="$save_CFLAGS"


            # Determine what GCC version number to use in filesystem paths.

            
            GCC_BASE_VER


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

            
            AC_CONFIG_FILES(Makefile testsuite/Makefile libgomp.spec)

            
            AC_CONFIG_FILES([testsuite/libgomp-test-support.pt.exp:testsuite/libgomp-test-support.exp.in])

            
            AC_CONFIG_FILES([testsuite/libgomp-site-extra.exp])

            
            AC_OUTPUT
	# Process this file with autoconf to produce a configure script, like so:
	# aclocal -I ../config && autoconf && autoheader && automake

	AC_INIT([GNU Offloading and Multi Processing 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)

	# 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-dist: we don't want 'dist' and related rules.
	# -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 no-dist -Wall -Wno-portability -Wno-override])
	AM_ENABLE_MULTILIB(, ..)

	GCC_WITH_TOOLEXECLIBDIR

	# 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)'
	case ${with_toolexeclibdir} in
	no)
	toolexeclibdir='$(toolexecdir)/lib'
	;;
	*)
	toolexeclibdir=${with_toolexeclibdir}
	;;
	esac
	else
	toolexecdir='$(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_force([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"

	AC_ARG_ENABLE([werror],
	[AS_HELP_STRING([--disable-werror], [disable building with -Werror])])
	# Add -Wall -Werror if we are using GCC.
	AS_IF([test "x$GCC" = "xyes"],
	[XCFLAGS="$XCFLAGS -Wall"])
	AS_IF([test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"],
	[XCFLAGS="$XCFLAGS -Werror"])

	# Find other programs we need.
	AC_CHECK_TOOL(AR, ar)
	AC_CHECK_TOOL(RANLIB, ranlib, ranlib-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]\|4.[1-9][0-9]\|[5-9]\|[1-9][0-9]])
	AM_CONDITIONAL(BUILD_INFO, test $gcc_cv_prog_makeinfo_modern = "yes")


	# Configure libtool
	LT_INIT
	ACX_LT_HOST_FLAGS
	AC_SUBST(enable_shared)
	AC_SUBST(enable_static)
	AM_CONDITIONAL([ENABLE_DARWIN_AT_RPATH], [test x$enable_darwin_at_rpath = xyes])

	AM_MAINTAINER_MODE

	# Create a spec file, so that compile/link tests don't fail
	test -f libgfortran.spec \|\| touch libgfortran.spec
	FCFLAGS="$FCFLAGS -L."

	# 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)
	case `echo $GFORTRAN` in
	-* \| no* )
	FC=no ;;
	*)
	set dummy $GFORTRAN; ac_word=$2
	if test -x "$ac_word"; then
	FC="$GFORTRAN"
	else
	FC=no
	fi ;;
	esac
	AC_PROG_FC(gfortran)
	FCFLAGS="$FCFLAGS -Wall -L../libgfortran"

	# For libtool versioning info, format is CURRENT:REVISION:AGE
	libtool_VERSION=1:0:0
	AC_SUBST(libtool_VERSION)

	# Check header files.
	AC_HEADER_STDC
	AC_HEADER_TIME
	ACX_HEADER_STRING
	AC_CHECK_HEADERS(pthread.h unistd.h semaphore.h sys/loadavg.h sys/sysctl.h sys/time.h)

	XPCFLAGS=""
	case "$host" in
	--rtems*)
	# RTEMS supports Pthreads, but the library is not available at GCC build time.
	;;
	nvptx--* \| amdgcn--*)
	# NVPTX does not support Pthreads, has its own code replacement.
	libgomp_use_pthreads=no
	# NVPTX is an accelerator-only target
	libgomp_offloaded_only=yes
	;;
	*)
	# Check to see if -pthread or -lpthread is needed. Prefer the former.
	# In case the pthread.h system header is not found, this test will fail.
	CFLAGS="$CFLAGS -pthread"
	AC_LINK_IFELSE(
	[AC_LANG_PROGRAM(
	[#include <pthread.h>
	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 <pthread.h>
	void g(void d) { return NULL; }],
	[pthread_t t; pthread_create(&t,NULL,g,NULL);])],
	[],
	[AC_MSG_ERROR([Pthreads are required to build libgomp])])])
	esac

	if test x$libgomp_use_pthreads != xno; then
	AC_DEFINE(LIBGOMP_USE_PTHREADS, 1,
	[Define to 1 if libgomp should use POSIX threads.])
	fi

	if test x$libgomp_offloaded_only = xyes; then
	AC_DEFINE(LIBGOMP_OFFLOADED_ONLY, 1,
	[Define to 1 if building libgomp for an accelerator-only target.])
	fi

	if test "x$enable_offload_defaulted" = xyes; then
	AC_DEFINE(OFFLOAD_DEFAULTED, 1,
	[Define to 1 to if -foffload is defaulted])
	fi

	AC_CHECK_SIZEOF([void *])

	m4_include([plugin/configfrag.ac])

	if test x"$offload_plugins" != x; then
	AC_DEFINE(LIBGOMP_OFFLOAD_HOST, 1,
	[Define to 1 if building libgomp for a offload host])
	fi

	# Check for functions needed.
	AC_CHECK_FUNCS(getloadavg clock_gettime strtoull)
	AC_CHECK_FUNCS(aligned_alloc posix_memalign memalign _aligned_malloc)

	# 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.)
	;;
	esac

	# RTEMS specific checks
	case "$host" in
	--rtems*)
	AC_CHECK_TYPES([struct _Mutex_Control],[],[],[#include <sys/lock.h>])
	;;
	esac

	GCC_LINUX_FUTEX(:)

	# Check for pthread_{,attr_}[sg]etaffinity_np.
	AC_LINK_IFELSE(
	[AC_LANG_PROGRAM(
	[#define _GNU_SOURCE
	#include <pthread.h>],
	[cpu_set_t cpuset;
	pthread_attr_t attr;
	pthread_getaffinity_np (pthread_self (), sizeof (cpu_set_t), &cpuset);
	if (CPU_ISSET (0, &cpuset))
	CPU_SET (1, &cpuset);
	else
	CPU_ZERO (&cpuset);
	pthread_setaffinity_np (pthread_self (), sizeof (cpu_set_t), &cpuset);
	pthread_attr_init (&attr);
	pthread_attr_getaffinity_np (&attr, sizeof (cpu_set_t), &cpuset);
	pthread_attr_setaffinity_np (&attr, sizeof (cpu_set_t), &cpuset);])],
	AC_DEFINE(HAVE_PTHREAD_AFFINITY_NP, 1,
	[ Define if pthread_{,attr_}{g,s}etaffinity_np is supported.]))

	# 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

	# Check for uname.
	AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	[#include <string.h>
	#include <stdlib.h>
	#include <sys/utsname.h>],
	[struct utsname buf;
	volatile size_t len = 0;
	if (!uname (buf))
	len = strlen (buf.nodename);])],
	AC_DEFINE(HAVE_UNAME, 1,
	[ Define if uname is supported and struct utsname has nodename field.]))

	# Check for gethostname.
	AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	[#include <unistd.h>],
	[
	changequote(,)dnl
	char buf[256];
	if (gethostname (buf, sizeof (buf) - 1) == 0)
	buf[255] = '\0';
	changequote([,])dnl
	])],
	AC_DEFINE(HAVE_GETHOSTNAME, 1,
	[ Define if gethostname is supported.]))

	# Check for getpid.
	AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	[#include <unistd.h>],
	[int pid = getpid ();])],
	AC_DEFINE(HAVE_GETPID, 1,
	[ Define if getpid is supported.]))

	# See if we support thread-local storage.
	GCC_CHECK_TLS

	# See if we have emulated thread-local storage.
	GCC_CHECK_EMUTLS

	# See what sort of export controls are available.
	GCC_CHECK_ATTRIBUTE_VISIBILITY
	LIBGOMP_CHECK_ATTRIBUTE_DLLEXPORT
	LIBGOMP_CHECK_ATTRIBUTE_ALIAS
	LIBGOMP_ENABLE_SYMVERS

	if test $enable_symvers = gnu; then
	AC_DEFINE(LIBGOMP_GNU_SYMBOL_VERSIONING, 1,
	[Define to 1 if GNU symbol versioning is used for libgomp.])
	fi

	# Determine cpu count to limit testsuite parallelism.
	AX_COUNT_CPUS
	AC_SUBST(CPU_COUNT)

	AC_MSG_NOTICE([checking for flock implementation])
	AC_CHECK_PROGS(FLOCK, flock)
	# Fallback if 'perl' is available.
	if test -z "$FLOCK"; then
	# These need to be absolute paths, yet at the same time need to
	# canonicalize only relative paths, because then amd will not unmount
	# drives. Thus the use of PWDCMD: set it to 'pawd' or 'amq -w' if using amd.
	case $srcdir in
	changequote(,)dnl
	[\\/$]* \| ?:[\\/]*) libgomp_abs_srcdir=${srcdir} ;;
	changequote([,])dnl
	*) libgomp_abs_srcdir=`cd "$srcdir" && ${PWDCMD-pwd} \|\| echo "$srcdir"` ;;
	esac
	AC_CHECK_PROG(FLOCK, perl, $libgomp_abs_srcdir/testsuite/flock)
	fi

	AC_SUBST(SYSROOT_CFLAGS_FOR_TARGET)

	# 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

	# If offloading is enabled, both offload hosts and accelerators are required to support
	# __sync_* builtins, to simplify architectural assumptions between both sides
	if test x$libgomp_cv_have_sync_builtins = xno; then
	# We require accelerator targets to support __sync_* builtins.
	if test x$libgomp_offloaded_only = xyes; then
	AC_MSG_ERROR([accelerator targets require __sync_val_compare_and_swap to build libgomp.])
	fi
	# Same for offload hosts.
	if test x"$offload_plugins" != x; then
	AC_MSG_ERROR([offload hosts require __sync_val_compare_and_swap to build libgomp.])
	fi
	fi

	XCFLAGS="$XCFLAGS$XPCFLAGS"

	# Add CET specific flags if CET is enabled
	GCC_CET_FLAGS(CET_FLAGS)
	XCFLAGS="$XCFLAGS $CET_FLAGS"
	FCFLAGS="$FCFLAGS $CET_FLAGS"

	AC_SUBST(config_path)
	AC_SUBST(XCFLAGS)
	AC_SUBST(XLDFLAGS)

	# Conditionalize the makefile for this target machine.
	tmake_file_=
	for f in ${tmake_file}
	do
	if test -f ${srcdir}/config/$f
	then
	tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
	fi
	done
	tmake_file="${tmake_file_}"
	AC_SUBST(tmake_file)

	# 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 may force -pthread,
	# 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: $LIBS${DL_LIBS:+ $DL_LIBS}}"
	else
	link_gomp="-lgomp $LIBS${DL_LIBS:+ $DL_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 confdefs.h -include $srcdir/config/$i/omp-lock.h"
	break
	fi
	done

	AC_COMPUTE_INT([INTPTR_T_KIND], [sizeof (__INTPTR_TYPE__)])
	AC_COMPUTE_INT([OMP_INT128_SIZE], [sizeof (__int128)],,[OMP_INT128_SIZE=0])
	AC_COMPUTE_INT([OMP_DEPEND_KIND], [2*sizeof (__INTPTR_TYPE__)],,
	[OMP_DEPEND_KIND=0])
	AC_COMPUTE_INT([OMP_LOCK_SIZE], [sizeof (omp_lock_t)],,
	[AC_MSG_ERROR([unsupported system, cannot find sizeof (omp_lock_t)])])
	AC_COMPUTE_INT([OMP_LOCK_ALIGN], [__alignof (omp_lock_t)])
	AC_COMPUTE_INT([OMP_NEST_LOCK_SIZE], [sizeof (omp_nest_lock_t)])
	AC_COMPUTE_INT([OMP_NEST_LOCK_ALIGN], [__alignof (omp_nest_lock_t)])
	AC_COMPUTE_INT([OMP_LOCK_25_SIZE], [sizeof (omp_lock_25_t)],,
	[AC_MSG_ERROR([unsupported system, cannot find sizeof (omp_lock_25_t)])])
	AC_COMPUTE_INT([OMP_LOCK_25_ALIGN], [__alignof (omp_lock_25_t)])
	AC_COMPUTE_INT([OMP_NEST_LOCK_25_SIZE], [sizeof (omp_nest_lock_25_t)])
	AC_COMPUTE_INT([OMP_NEST_LOCK_25_ALIGN], [__alignof (omp_nest_lock_25_t)])

	# 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 $OMP_NEST_LOCK_SIZE; then
	OMP_NEST_LOCK_KIND=8
	fi
	OMP_LOCK_25_KIND=$OMP_LOCK_25_SIZE
	OMP_NEST_LOCK_25_KIND=$OMP_NEST_LOCK_25_SIZE
	if test $OMP_LOCK_25_SIZE -gt 8 \|\| test $OMP_LOCK_25_ALIGN -gt $OMP_LOCK_25_SIZE; then
	OMP_LOCK_25_KIND=8
	fi
	if test $OMP_NEST_LOCK_25_SIZE -gt 8 \|\| test $OMP_NEST_LOCK_25_ALIGN -gt $OMP_NEST_LOCK_25_SIZE; then
	OMP_NEST_LOCK_25_KIND=8
	fi
	if test "$ac_cv_fc_compiler_gnu" = yes; then
	if test $OMP_DEPEND_KIND -eq 16; then
	if test $OMP_INT128_SIZE -ne 16; then
	AC_MSG_ERROR([unsupported system, cannot find Fortran int kind=16, needed for omp_depend_kind])
	fi
	else
	if test $OMP_DEPEND_KIND -ne 8; then
	AC_MSG_ERROR([unsupported system, cannot find Fortran integer kind for omp_depend_kind])
	fi
	fi
	fi

	AC_SUBST(INTPTR_T_KIND)
	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)
	AC_SUBST(OMP_LOCK_25_SIZE)
	AC_SUBST(OMP_LOCK_25_ALIGN)
	AC_SUBST(OMP_NEST_LOCK_25_SIZE)
	AC_SUBST(OMP_NEST_LOCK_25_ALIGN)
	AC_SUBST(OMP_LOCK_25_KIND)
	AC_SUBST(OMP_NEST_LOCK_25_KIND)
	AC_SUBST(OMP_DEPEND_KIND)
	CFLAGS="$save_CFLAGS"

	# Determine what GCC version number to use in filesystem paths.
	GCC_BASE_VER

	AC_CONFIG_FILES(omp.h omp_lib.h omp_lib.f90 libgomp_f.h)
	AC_CONFIG_FILES(Makefile testsuite/Makefile libgomp.spec)
	AC_CONFIG_FILES([testsuite/libgomp-test-support.pt.exp:testsuite/libgomp-test-support.exp.in])
	AC_CONFIG_FILES([testsuite/libgomp-site-extra.exp])
	AC_OUTPUT