dnl PAC_FC_SEARCH_LIST - expands to a whitespace separated list of modern

dnl fortran compilers for use with AC_PROG_FC that is more suitable for HPC

dnl software packages

AC_DEFUN([PAC_FC_SEARCH_LIST],

         [ifort pgf90 pathf90 pathf95 xlf90 xlf95 xlf2003 gfortran f90 epcf90 f95 fort lf95 g95 ifc efc gfc])

dnl /*D

dnl PAC_PROG_FC([COMPILERS])

dnl

dnl COMPILERS is a space separated list of Fortran 77 compilers to search

dnl for.  Fortran 95 isn't strictly backwards-compatible with Fortran 77,

dnl but `f95' is worth trying.

dnl

dnl Compilers are ordered by

dnl  1. F77, F90, F95

dnl  2. Good/tested native compilers, bad/untested native compilers

dnl  3. Wrappers around f2c go last.

dnl

dnl `fort77' is a wrapper around `f2c'.

dnl It is believed that under HP-UX `fort77' is the name of the native

dnl compiler.  On some Cray systems, fort77 is a native compiler.

dnl frt is the Fujitsu F77 compiler.

dnl pgf77 and pgf90 are the Portland Group F77 and F90 compilers.

dnl xlf/xlf90/xlf95/xlf2003 are IBM (AIX) F77/F90/F95/F2003 compilers.

dnl lf95 is the Lahey-Fujitsu compiler.

dnl fl32 is the Microsoft Fortran "PowerStation" compiler.

dnl af77 is the Apogee F77 compiler for Intergraph hardware running CLIX.

dnl epcf90 is the "Edinburgh Portable Compiler" F90.

dnl fort is the Compaq Fortran 90 (now 95) compiler for Tru64 and Linux/Alpha.

dnl pathf90 is the Pathscale Fortran 90 compiler

dnl ifort is another name for the Intel f90 compiler

dnl efc - An older Intel compiler (?)

dnl ifc - An older Intel compiler

dnl fc  - A compiler on some unknown system.  This has been removed because

dnl       it may also be the name of a command for something other than

dnl       the Fortran compiler (e.g., fc=file system check!)

dnl gfortran - The GNU Fortran compiler (not the same as g95) 

dnl gfc - An alias for gfortran recommended in cygwin installations

dnl NOTE: this macro suffers from a basically intractable "expanded before it

dnl was required" problem when libtool is also used

dnl D*/

AC_DEFUN([PAC_PROG_FC],[

PAC_PUSH_FLAG([FCFLAGS])

AC_PROG_FC([m4_default([$1],[PAC_FC_SEARCH_LIST])])

PAC_POP_FLAG([FCFLAGS])

])

dnl

dnl PAC_FC_EXT checks for the default Fortran 90 program extension, f90 then f.

dnl This could be replaced by AC_FC_SRCEXT but since AC_FC_SRCEXT

dnl adds FCFLAGS_ext, which is used to modify FCFLAGS or Makefile.in.

dnl So will do this later.

dnl

AC_DEFUN([PAC_FC_EXT],[

AC_MSG_CHECKING([for extension for Fortran 90 programs])

ac_fc_srcext="f90"

AC_LANG_PUSH(Fortran)

AC_COMPILE_IFELSE([

    AC_LANG_PROGRAM()

],[

    AC_MSG_RESULT([f90])

],[

    ac_fc_srcext="f" 

    AC_COMPILE_IFELSE([

        AC_LANG_PROGRAM()

    ],[

        AC_MSG_RESULT([f])

    ],[

        AC_MSG_RESULT([unknown!])

    ])

])

AC_LANG_POP(Fortran)

])

dnl

dnl Internal routine for testing F90

dnl PAC_PROG_FC_WORKS()

dnl

AC_DEFUN([PAC_PROG_FC_WORKS],[

AC_REQUIRE([PAC_FC_EXT])

AC_LANG_PUSH(Fortran)

AC_MSG_CHECKING([whether the Fortran 90 compiler ($FC $FCFLAGS $LDFLAGS) works])

AC_LINK_IFELSE([

    AC_LANG_SOURCE([

        program conftest

        integer, dimension(10) :: n

        end

    ])

],[

    pac_cv_prog_fc_works="yes"

    AC_MSG_RESULT([$pac_cv_prog_fc_works])

    AC_MSG_CHECKING([whether the Fortran 90 compiler ($FC $FCFLAGS $LDFLAGS) is a cross-compiler])

    AC_RUN_IFELSE([],

    [pac_cv_prog_fc_cross="no"],

    [pac_cv_prog_fc_cross="yes"],

    [pac_cv_prog_fc_cross="$cross_compiling"]

    )

    AC_MSG_RESULT($pac_cv_prog_fc_cross)

],[

    pac_cv_prog_fc_works="no"

    AC_MSG_WARN([installation or configuration problem: Fortran 90 compiler cannot create executables.])

])

# The intel compiler sometimes generates these work.pc and .pcl files

rm -f work.pc work.pcl

AC_LANG_POP(Fortran)

dnl cross_compiling no longer maintained by autoconf as part of the

dnl AC_LANG changes.  If we set it here, a later AC_LANG may not 

dnl restore it (in the case where one compiler claims to be a cross compiler

dnl and another does not)

dnl cross_compiling=$pac_cv_prog_f90_cross

])

dnl/*D 

dnl PAC_PROG_FC_INT_KIND - Determine kind parameter for an integer with

dnl the specified number of bytes.

dnl

dnl Synopsis:

dnl  PAC_PROG_FC_INT_KIND(variable-to-set,number-of-bytes,[cross-size])

dnl

dnl D*/

AC_DEFUN([PAC_PROG_FC_INT_KIND],[

# Set the default

$1=-1

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

    AS_IF([test -z "$3"],[AC_MSG_ERROR(['$3' is empty])])

    $1="$3"

else

    AC_LANG_PUSH(Fortran)

    AC_MSG_CHECKING([for Fortran 90 integer kind for $2-byte integers])

    # Convert bytes to digits

    case $2 in 

        1) sellen=2 ;;

        2) sellen=4 ;;

        4) sellen=8 ;;

        8) sellen=16 ;;

       16) sellen=30 ;;

        *) sellen=8 ;;

    esac

    # Check for cached value

    eval testval=\$"pac_cv_prog_fc_int_kind_$sellen"

    if test -n "$testval" ; then 

        AC_MSG_RESULT([$testval (cached)])

        $1=$testval

    else

        KINDVAL="unavailable"

        eval "pac_cv_prog_fc_int_kind_$sellen"=-1

        AC_RUN_IFELSE([

            AC_LANG_SOURCE([

                program main

                integer ii

                ii = selected_int_kind($sellen)

                open(8, file="conftest1.out", form="formatted")

                write (8,*) ii

                close(8)

                stop

                end

            ])

        ],[pac_run_ok=yes],[pac_run_ok=no])

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

            if test -s conftest1.out ; then

                # Because of write, there may be a leading blank.

                KINDVAL=`cat conftest1.out | sed 's/ //g'`

                eval "pac_cv_prog_fc_int_kind_$sellen"=$KINDVAL

                $1=$KINDVAL

            fi

        fi

        AC_MSG_RESULT([$KINDVAL])

    fi # not cached

    AC_LANG_POP(Fortran)

fi # is not cross compiling

])dnl

dnl

dnl ------------------------------------------------------------------------

dnl Special characteristics that have no autoconf counterpart but that

dnl we need as part of the Fortran 90 support.  To distinquish these, they

dnl have a [PAC] prefix.

dnl 

dnl At least one version of the Cray compiler needs the option -em to

dnl generate a separate module file, rather than including the module

dnl information in the object (.o) file.

dnl

dnl

dnl PAC_FC_MODULE_EXT(action if found,action if not found)

dnl

AC_DEFUN([PAC_FC_MODULE_EXT],

[AC_CACHE_CHECK([for Fortran 90 module extension],

pac_cv_fc_module_ext,[

pac_cv_fc_module_case="unknown"

AC_LANG_PUSH(Fortran)

AC_COMPILE_IFELSE([

    AC_LANG_SOURCE([

        module conftest

        integer n

        parameter (n=1)

        end module conftest

    ])

],[

    # Look for module name

    # First, try to find known names.  This avoids confusion caused by

    # additional files (like <name>.stb created by some versions of pgf90)

    # Early versions of the Intel compiler used d as the module extension;

    # we include that just to finish the test as early as possible.

    for name in conftest CONFTEST ; do

        for ext in mod MOD d ; do

            if test -s $name.$ext ; then

                if test $name = conftest ; then

                    pac_cv_fc_module_case=lower

                else

                    pac_cv_fc_module_case=upper

                fi

                pac_cv_fc_module_ext=$ext

                pac_MOD=$ext

                break

            fi

        done

        if test -n "$pac_cv_fc_module_ext" ; then break ; fi

    done

    if test -z "$pac_MOD" ; then

        # The test on .err is needed for Cray Fortran.

        pac_MOD=`ls conftest.* 2>&1 | grep -v conftest.${ac_fc_srcext} | grep -v conftest.o | grep -v conftest.err`

        pac_MOD=`echo $pac_MOD | sed -e 's/conftest\.//g'`

        pac_cv_fc_module_case="lower"

        if test "X$pac_MOD" = "X" ; then

            pac_MOD=`ls CONFTEST* 2>&1 | grep -v CONFTEST.${ac_fc_srcext} | grep -v CONFTEST.o | grep -v CONFTEST.err`

            pac_MOD=`echo $pac_MOD | sed -e 's/CONFTEST\.//g'`

            if test -n "$pac_MOD" -a -s "CONFTEST.$pac_MOD" ; then

                pac_cv_fc_module_case="upper"

            else

                # Clear because we must have gotten an error message

                pac_MOD=""

            fi

        fi

        if test -z "$pac_MOD" ; then 

            pac_cv_fc_module_ext="unknown"

        else

            pac_cv_fc_module_ext=$pac_MOD

        fi

    fi

],[

    pac_cv_fc_module_ext="unknown"

])

if test "$pac_cv_fc_module_ext" = "unknown" ; then

    # Try again, but with an -em option.  Abbreviated, because we're

    # just looking for the Cray option

    saveFCFLAGS=$FCFLAGS

    FCFLAGS="$FCFLAGS -em"

    AC_COMPILE_IFELSE([

    AC_LANG_SOURCE([

        module conftest

        integer n

        parameter (n=1)

        end module conftest

    ])

],[

    if test -s conftest.mod ; then

        pac_cv_fc_module_ext="mod"

        pac_cv_fc_module_case="lower"

    elif test -s CONFTEST.mod ; then

        pac_cv_fc_module_ext="mod"

        pac_cv_fc_module_case="upper"

    fi

],[

    :

    # do nothing - already have the unknown default value

])

    if test "$pac_cv_fc_module_ext" = "unknown" ; then

        # The additional command line option did not help - restore

        # the original flags.

        FCFLAGS=$saveFCFLAGS

    fi

fi

AC_LANG_POP(Fortran)

])

#

AC_SUBST(FCMODEXT)

if test "$pac_cv_fc_module_ext" = "unknown" ; then

    ifelse($2,,:,[$2])

else

    ifelse($1,,FCMODEXT=$pac_MOD,[$1])

fi

])

dnl

dnl

dnl PAC_FC_MODULE_INCFLAG

AC_DEFUN([PAC_FC_MODULE_INCFLAG],[

AC_REQUIRE([PAC_FC_MODULE_EXT])

AC_CACHE_CHECK([for Fortran 90 module include flag],

pac_cv_fc_module_incflag,[

AC_LANG_PUSH(Fortran)

AC_LANG_CONFTEST([

    AC_LANG_SOURCE([

        module conf

        integer n

        parameter (n=1)

        end module conf

    ])

])

pac_madedir="no"

if test ! -d conf ; then mkdir conftestdir ; pac_madedir="yes"; fi

if test "$pac_cv_fc_module_case" = "upper" ; then

    pac_module="CONF.$pac_cv_fc_module_ext"

else

    pac_module="conf.$pac_cv_fc_module_ext"

fi

AC_COMPILE_IFELSE([],[

    if test -s "$pac_module" ; then

        mv $pac_module conftestdir

        # Remove any temporary files, and hide the work.pc file

        # (if the compiler generates them)

        if test -f work.pc ; then 

            mv -f work.pc conftest.pc

        fi

        rm -f work.pcl

    else

        AC_MSG_WARN([Unable to build a simple Fortran 90 module])

        # echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD

        # cat conftest.$ac_ext >&AS_MESSAGE_LOG_FD

        _AC_MSG_LOG_CONFTEST

    fi

],[])

# Remove the conftest* after AC_LANG_CONFTEST

rm -rf conftest.dSYM

rm -f conftest.$ac_ext

dnl Create the conftest here so the test isn't created everytime inside loop.

AC_LANG_CONFTEST([AC_LANG_PROGRAM([],[use conf])])

# Save the original FCFLAGS

saved_FCFLAGS="$FCFLAGS"

pac_cv_fc_module_incflag=""

for inchdr in '-I' '-M' '-p' ; do

    FCFLAGS="$saved_FCFLAGS ${inchdr}conftestdir"

    AC_COMPILE_IFELSE([],[pac_cv_fc_module_incflag="$inchdr" ; break])

done

if test "X$pac_cv_fc_module_incflag" = "X" ; then

    if test -s conftest.pc ; then

        mv conftest.pc conftestdir/mpimod.pc

        echo "mpimod.pc" > conftestdir/mpimod.pcl

        echo "`pwd`/conftestdir/mpimod.pc" >> conftestdir/mpimod.pcl

        inchdr='-cl,'

        FCFLAGS="$save_FCFLAGS ${inchdr}conftestdir"

        AC_COMPILE_IFELSE([], [pac_fcompile_ok=yes], [pac_fcompile_ok=no])

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

            pac_cv_fc_module_incflag="$inchdr"

            # Not quite right; see the comments that follow

            AC_MSG_RESULT([-cl,filename where filename contains a list of files and directories])

            FC_WORK_FILES_ARG="-cl,mpimod.pcl"

            FCMODINCSPEC="-cl,<dir>/<file>mod.pcl"

        else 

            # The version of the Intel compiler that I have refuses to let

            # you put the "work catalog" list anywhere but the current directory.

            pac_cv_fc_module_incflag="Unavailable!"

        fi

    else

        # Early versions of the Intel ifc compiler required a *file*

        # containing the names of files that contained the names of the

        # 

        # -cl,filename.pcl

        #   filename.pcl contains

        #     fullpathname.pc

        # The "fullpathname.pc" is generated, I believe, when a module is 

        # compiled.  

        # Intel compilers use a wierd system: -cl,filename.pcl .  If no file is

        # specified, work.pcl and work.pc are created.  However, if you specify

        # a file, it must contain the name of a file ending in .pc .  Ugh!

        pac_cv_fc_module_incflag="unknown"

    fi

fi

# Restore the original FCFLAGS

FCFLAGS="$saved_FCFLAGS"

if test "$pac_madedir" = "yes" ; then rm -rf conftestdir ; fi

# Remove the conftest* after AC_LANG_CONFTEST

# This is needed for Mac OSX 10.5

rm -rf conftest.dSYM

rm -f conftest*

AC_LANG_POP(Fortran)

])

AC_SUBST(FC_WORK_FILES_ARG)

AC_SUBST(FCMODINCFLAG)

FCMODINCFLAG=$pac_cv_fc_module_incflag

])

dnl

dnl

dnl

AC_DEFUN([PAC_FC_MODULE],[

PAC_FC_MODULE_EXT

PAC_FC_MODULE_INCFLAG

PAC_FC_MODULE_OUTFLAG

])

dnl

dnl PAC_FC_MODULE_OUTFLAG

AC_DEFUN([PAC_FC_MODULE_OUTFLAG],[

AC_REQUIRE([PAC_FC_MODULE_EXT])

AC_CACHE_CHECK([for Fortran 90 module output directory flag],

               [pac_cv_fc_module_outflag],

[

AC_LANG_PUSH([Fortran])

AC_LANG_CONFTEST([

    AC_LANG_SOURCE([

        module conf

        integer n

        parameter (n=1)

        end module conf

    ])

])

pac_madedir="no"

if test ! -d conf ; then mkdir conftestdir ; pac_madedir="yes"; fi

if test "$pac_cv_fc_module_case" = "upper" ; then

    pac_module="CONF.$pac_cv_fc_module_ext"

else

    pac_module="conf.$pac_cv_fc_module_ext"

fi

# check base case that the compiler can create modules and that they endup in

# the current directory

AC_COMPILE_IFELSE([],[

    if test -s "$pac_module" ; then

        rm -f "$pac_module"

        # Remove any temporary files, and hide the work.pc file

        # (if the compiler generates them)

        if test -f work.pc ; then 

            mv -f work.pc conftest.pc

        fi

        rm -f work.pcl

    else

        AC_MSG_WARN([Unable to build a simple Fortran 90 module])

        # echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD

        # cat conftest.$ac_ext >&AS_MESSAGE_LOG_FD

        _AC_MSG_LOG_CONFTEST

    fi

],[])

# known flags for reasonably recent versions of various f90 compilers:

#   gfortran -J${dir}

#   xlf -qmoddir=${dir}

#   pgf90 -module ${dir}

#   ifort -module ${dir}

#   nagfor -mdir ${dir}

#   ftn -J ${dir}              ## the Cray fortran compiler

#   ftn -em -J${dir}           ## the Cray fortran compiler (crayftn, in 2013)

#      For this above case, we must have added -em to FCFLAGS, since other

#      module tests do not always use the module output flag.  See

#      FC_MODULE_EXT , where this is determined.

#   f95 -YMOD_OUT_DIR=${dir}   ## the Absoft fortran compiler

#   lf95 -M ${dir}             ## the Lahey/Fujitsu fortran compiler

#   f90 -moddir=${dir}         ## the Sun f90 compiler

#   g95 -fmod=${dir}

#

# If there are any compilers still out there that are totally brain-dead and

# don't support an output directory flag, we can write a wrapper script to tell

# users to use.  Alternatively they can use an older version of MPICH.

pac_cv_fc_module_outflag=

for mod_flag in '-J' '-J ' '-qmoddir=' '-module ' '-YMOD_OUT_DIR=' '-mdir ' '-moddir=' '-fmod=' '-M '; do

    rm -f conftestdir/NONEXISTENT conftestdir/*

    PAC_PUSH_FLAG([FCFLAGS])

    FCFLAGS="$FCFLAGS ${mod_flag}conftestdir"

    AC_COMPILE_IFELSE([],[pac_build_success=yes],[pac_build_success=no])

    AS_IF([test "X$pac_build_success" = Xyes],

          [AS_IF([test -s "conftestdir/${pac_module}"],

                 [pac_cv_fc_module_outflag="$mod_flag"])])

    PAC_POP_FLAG([FCFLAGS])

    AS_IF([test "X$pac_cv_fc_module_outflag" = X],[:],[break])

done

# Remove the conftest* after AC_LANG_CONFTEST

rm -rf conftest.dSYM

rm -f conftest.$ac_ext

if test "$pac_madedir" = "yes" ; then rm -rf conftestdir ; fi

AS_UNSET([pac_madedir])

# Remove the conftest* after AC_LANG_CONFTEST

# This is needed for Mac OSX 10.5

rm -rf conftest.dSYM

rm -f conftest*

AC_LANG_POP(Fortran)

])dnl end AC_CACHE_CHECK

AC_SUBST([FCMODOUTFLAG],[$pac_cv_fc_module_outflag])

])dnl end AC_DEFUN([PAC_FC_MODULE_OUTFLAG])

dnl

dnl PAC_FC_AND_F77_COMPATIBLE([action-if-true],[action-if-false])

dnl

dnl Determine whether object files compiled with Fortran 77 can be 

dnl linked to Fortran 90 main programs.

dnl

dnl The test uses a name that includes an underscore unless the 3rd

dnl argument provides another routine name.

dnl

AC_DEFUN([PAC_FC_AND_F77_COMPATIBLE],[

AC_REQUIRE([PAC_PROG_FC_WORKS])

AC_CACHE_CHECK([whether Fortran 90 compiler works with Fortran 77 compiler],

pac_cv_fc_and_f77,[

pacTestRoutine=foo_abc

ifelse([$3],,,[eval pacTestRoutine=$3])

pac_cv_fc_and_f77="unknown"

# compile the f77 program and link with the f90 program

# The reverse may not work because the Fortran 90 environment may

# expect to be in control (and to provide library files unknown to any other

# environment, even Fortran 77!)

AC_LANG_PUSH(Fortran 77)

AC_COMPILE_IFELSE([

    AC_LANG_SOURCE([

        subroutine ${pacTestRoutine}(b)

        integer b

        b = b + 1

        end

    ])

],[

    # pac_f77compile_ok=yes

    PAC_RUNLOG([mv conftest.$OBJEXT pac_f77conftest.$OBJEXT])

    # Save original LIBS, prepend previously generated object file to LIBS

    saved_LIBS="$LIBS"

    LIBS="pac_f77conftest.$OBJEXT $LIBS"

    AC_LANG_PUSH(Fortran)

    AC_LINK_IFELSE([

        AC_LANG_SOURCE([

            program main

            integer a

            a = 1

            call ${pacTestRoutine}(a)

            end

        ])

    ],[pac_cv_fc_and_f77=yes],[pac_cv_fc_and_f77=no])

    # Some versions of the Intel compiler produce these two files

    rm -f work.pc work.pcl

    # Restore LIBS

    LIBS="$saved_LIBS"

    AC_LANG_POP(Fortran)

    # remove previously generated object file.

    rm -f pac_f77conftest.$OBJEXT

], [

    # pac_f77compile_ok=no

    pac_cv_fc_and_f77=no

])

AC_LANG_POP(Fortran 77)

# Perform the requested action based on whether the test succeeded

if test "$pac_cv_fc_and_f77" = yes ; then

    ifelse($1,,:,[$1])

else

    ifelse($2,,:,[$2])

    AC_MSG_WARN([See config.log for the failed test program and its output.])

fi

])

dnl

])

dnl

dnl

dnl /*D 

dnl PAC_PROG_FC_CRAY_POINTER - Check if Fortran supports Cray-style pointer.

dnl                            If so, set pac_cv_prog_fc_has_pointer to yes

dnl                            and find out if any extra compiler flag is

dnl                            needed and set it as CRAYPTR_FCFLAGS.

dnl                            i.e. CRAYPTR_FCFLAGS is meaningful only if

dnl                            pac_cv_prog_fc_has_pointer = yes.

dnl

dnl Synopsis:

dnl   PAC_PROG_FC_CRAY_POINTER([action-if-true],[action-if-false])

dnl D*/

AC_DEFUN([PAC_PROG_FC_CRAY_POINTER],[

AC_CACHE_CHECK([whether Fortran 90 supports Cray-style pointer],

pac_cv_prog_fc_has_pointer,[

AC_LANG_PUSH([Fortran])

AC_LANG_CONFTEST([

    AC_LANG_PROGRAM([],[

        integer M

        pointer (MPTR,M)

        data MPTR/0/

    ])

])

saved_FCFLAGS="$FCFLAGS"

pac_cv_prog_fc_has_pointer=no

CRAYPTR_FCFLAGS=""

for ptrflag in '' '-fcray-pointer' ; do

    FCFLAGS="$saved_FCFLAGS $ptrflag"

    AC_COMPILE_IFELSE([],[

        pac_cv_prog_fc_has_pointer=yes

        CRAYPTR_FCFLAGS="$ptrflag"

        break

    ])

done

dnl Restore FCFLAGS first, since user may not want to modify FCFLAGS

FCFLAGS="$saved_FCFLAGS"

dnl remove conftest after ac_lang_conftest

rm -f conftest.$ac_ext

AC_LANG_POP([Fortran])

])

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

    AC_MSG_CHECKING([for Fortran 90 compiler flag for Cray-style pointer])

    if test "X$CRAYPTR_FCFLAGS" != "X" ; then

        AC_MSG_RESULT([$CRAYPTR_FCFLAGS])

    else

        AC_MSG_RESULT([none])

    fi

    ifelse([$1],[],[:],[$1])

else

    ifelse([$2],[],[:],[$2])

fi

])

dnl

dnl

dnl

AC_DEFUN([PAC_PROG_FC_AND_C_STDIO_LIBS],[

AC_REQUIRE([AC_HEADER_STDC])

# To simply the code in the cache_check macro, chose the routine name

# first, in case we need it

confname=conf1_

case "$pac_cv_prog_f77_name_mangle" in

    "lower underscore")       confname=conf1_  ;;

    "upper stdcall")          confname=CONF1   ;;

    upper)                    confname=CONF1   ;;

    "lower doubleunderscore") confname=conf1_  ;;

    lower)                    confname=conf1   ;;

    "mixed underscore")       confname=conf1_  ;;

    mixed)                    confname=conf1   ;;

esac

AC_CACHE_CHECK([what libraries are needed to link Fortran90 programs with C routines that use stdio],pac_cv_prog_fc_and_c_stdio_libs,[

pac_cv_prog_fc_and_c_stdio_libs=unknown

AC_LANG_PUSH(C)

AC_COMPILE_IFELSE([

    AC_LANG_SOURCE([

#if defined(HAVE_STDIO_H) || defined(STDC_HEADERS)

#include <stdio.h>

#endif

int $confname( int a )

{ printf( "The answer is %d\n", a ); fflush(stdout); return 0; }

    ])

],[

    pac_compile_ok=yes

    PAC_RUNLOG([mv conftest.$OBJEXT pac_conftest.$OBJEXT])

    # Save LIBS and prepend object file to LIBS

    saved_LIBS="$LIBS"

    LIBS="pac_conftest.$OBJEXT $LIBS"

    AC_LANG_PUSH(Fortran)

    AC_LINK_IFELSE([

        AC_LANG_PROGRAM([],[call conf1(0)])

    ],[

        pac_cv_prog_fc_and_c_stdio_libs=none

    ],[

        # Try again with -lSystemStubs

        LIBS="$LIBS -lSystemStubs"

        AC_LINK_IFELSE([],[

            pac_cv_prog_fc_and_c_stdio_libs="-lSystemStubs"

        ],[])

    ])

    LIBS="$saved_LIBS"

    AC_LANG_POP(Fortran)

    rm -f pac_conftest.$OBJEXT

])

AC_LANG_POP(C)

dnl

if test "$pac_cv_prog_fc_and_c_stdio_libs" != none -a \

        "$pac_cv_prog_fc_and_c_stdio_libs" != unknown ; then

    FC_OTHER_LIBS="$FC_OTHER_LIBS $pac_cv_prog_fc_and_c_stdio_libs"    

fi

])

dnl

])

dnl

dnl/*D

dnl PAC_FC_CHECK_COMPILER_OPTION - Check that a FC compiler option is

dnl accepted without warning messages

dnl

dnl Synopsis:

dnl PAC_FC_CHECK_COMPILER_OPTION(optionname,action-if-ok,action-if-fail)

dnl

dnl Output Effects:

dnl

dnl If no actions are specified, a working value is added to 'FCOPTIONS'

dnl

dnl Notes:

dnl This is now careful to check that the output is different, since 

dnl some compilers are noisy.

dnl 

dnl We are extra careful to prototype the functions in case compiler options

dnl that complain about poor code are in effect.

dnl

dnl Because this is a long script, we have ensured that you can pass a 

dnl variable containing the option name as the first argument.

dnl D*/

AC_DEFUN([PAC_FC_CHECK_COMPILER_OPTION],[

AC_MSG_CHECKING([whether Fortran 90 compiler accepts option $1])

pac_opt="$1"

AC_LANG_PUSH(Fortran)

FCFLAGS_orig="$FCFLAGS"

FCFLAGS_opt="$pac_opt $FCFLAGS"

pac_result="unknown"

AC_LANG_CONFTEST([AC_LANG_PROGRAM()])

FCFLAGS="$FCFLAGS_orig"

rm -f pac_test1.log

PAC_LINK_IFELSE_LOG([pac_test1.log], [], [

    FCFLAGS="$FCFLAGS_opt"

    rm -f pac_test2.log

    PAC_LINK_IFELSE_LOG([pac_test2.log], [], [

        PAC_RUNLOG_IFELSE([diff -b pac_test1.log pac_test2.log],

                          [pac_result=yes], [pac_result=no])

    ],[

        pac_result=no

    ])

], [

    pac_result=no

])

AC_MSG_RESULT([$pac_result])

dnl Delete the conftest created by AC_LANG_CONFTEST.

rm -f conftest.$ac_ext

#

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

    AC_MSG_CHECKING([whether routines compiled with $pac_opt can be linked with ones compiled without $pac_opt])

    pac_result=unknown

    FCFLAGS="$FCFLAGS_orig"

    rm -f pac_test3.log

    PAC_COMPILE_IFELSE_LOG([pac_test3.log], [

        AC_LANG_SOURCE([

            subroutine try()

            end

        ])

    ],[

        PAC_RUNLOG([mv conftest.$OBJEXT pac_conftest.$OBJEXT])

        saved_LIBS="$LIBS"

        LIBS="pac_conftest.$OBJEXT $LIBS"

        FCFLAGS="$FCFLAGS_opt"

        rm -f pac_test4.log

        PAC_LINK_IFELSE_LOG([pac_test4.log], [AC_LANG_PROGRAM()], [

            PAC_RUNLOG_IFELSE([diff -b pac_test2.log pac_test4.log],

                              [pac_result=yes], [pac_result=no])

        ],[

            pac_result=no

        ])

        LIBS="$saved_LIBS"

        rm -f pac_conftest.$OBJEXT

    ],[

        pac_result=no

    ])

    AC_MSG_RESULT([$pac_result])

    rm -f pac_test3.log pac_test4.log

fi

rm -f pac_test1.log pac_test2.log

dnl Restore FCFLAGS before 2nd/3rd argument commands are executed,

dnl as 2nd/3rd argument command could be modifying FCFLAGS.

FCFLAGS="$FCFLAGS_orig"

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

     ifelse([$2],[],[FCOPTIONS="$FCOPTIONS $1"],[$2])

else

     ifelse([$3],[],[:],[$3])

fi

AC_LANG_POP(Fortran)

])

dnl /*D

dnl PAC_FC_WORKS_WITH_CPP

dnl

dnl Checks if Fortran 90 compiler works with C preprocessor

dnl

dnl Most systems allow the Fortran compiler to process .F and .F90 files

dnl using the C preprocessor.  However, some systems either do not

dnl allow this or have serious bugs (OSF Fortran compilers have a bug

dnl that generates an error message from cpp).  The following test

dnl checks to see if .F works, and if not, whether "cpp -P -C" can be used

dnl D*/

AC_DEFUN([PAC_FC_WORKS_WITH_CPP],[

AC_REQUIRE([AC_PROG_CPP])

AC_MSG_CHECKING([whether Fortran 90 compiler processes .F90 files with C preprocessor])

AC_LANG_PUSH([Fortran])

saved_fc_ext=${ac_ext}

ac_ext="F90"

saved_FCFLAGS="$FCFLAGS"

FCFLAGS="$FCFLAGS $CPPFLAGS"

AC_LANG_CONFTEST([

    AC_LANG_SOURCE([

        program main

#define ASIZE 10

        integer a(ASIZE)

        end

    ])

])

AC_COMPILE_IFELSE([],[

    pac_cv_fc_accepts_F90=yes

    ifelse([$1],[],[],[$1=""])

],[

    pac_cv_fc_accepts_F90=no

    ifelse([$1],[],[:],[$1="false"])

])

# Restore Fortran's ac_ext but not FCFLAGS

ac_ext="$saved_fc_ext"

if test "$pac_cv_fc_accepts_F90" != "yes" ; then

    pac_cpp_fc="$ac_cpp -C -P conftest.F90 > conftest.$ac_ext"

    PAC_RUNLOG_IFELSE([$pac_cpp_fc],[

        if test -s conftest.${ac_ext} ; then

            AC_COMPILE_IFELSE([],[

                pac_cv_fc_accepts_F90="no, use cpp"

                ifelse([$1],[],[],[$1="$CPP -C -P"])

            ],[])

            rm -f conftest.${ac_ext}

        fi

    ],[])

fi

FCFLAGS="$saved_FCFLAGS"

rm -f conftest.F90

AC_LANG_POP([Fortran])

AC_MSG_RESULT([$pac_cv_fc_accepts_F90])

])

dnl

dnl PAC_FC_VENDOR:

dnl Try to get a version string for the F90 compiler.  We may

dnl need this to find likely command-line arguments for accessing

dnl shared libraries

dnl

AC_DEFUN([PAC_FC_VENDOR],[

AC_MSG_CHECKING([for Fortran 90 compiler vendor])

# This is complicated by some compilers (such as the Intel 8.1 ifort)

# that return a non-zero status even when they accept the -V option

# (a zero status is returned only if there is a file).

pac_cv_fc_vendor="unknown"

for arg in --version -V -v ; do

    rm -f conftest.txt

    PAC_RUNLOG([$FC $arg </dev/null >conftest.txt 2>&1])

    # Ignore the return code, because some compilers set the

    # return code to zero on invalid arguments and some to 

    # non-zero on success (with no files to compile)

    if test -f conftest.txt ; then

        if grep 'Portland Group' conftest.txt >/dev/null 2>&1 ; then

            pac_cv_fc_vendor=pgi

        elif grep 'Sun Workshop' conftest.txt >/dev/null 2>&1 ; then

            pac_cv_fc_vendor=sun

	elif grep 'Sun Fortran 9' conftest.txt >/dev/null 2>&1 ; then 

	    pac_cv_fc_vendor=sun

        elif grep 'Absoft' conftest.txt >/dev/null 2>&1 ; then

            pac_cv_fc_vendor=absoft

        elif grep 'G95' conftest.txt >/dev/null 2>&1 ; then

            pac_cv_fc_vendor=gnu

        elif grep 'GNU Fortran' conftest.txt >/dev/null 2>&1 ; then

            # This is gfortran

            pac_cv_fc_vendor=gnu

        elif grep Intel conftest.txt >/dev/null 2>&1 ; then

            pac_cv_fc_vendor=intel

        fi

    fi

    if test "$pac_cv_fc_vendor" != "unknown" ; then break ; fi

done

if test "$pac_cv_fc_vendor" = "unknown" ; then

    # Try to use the compiler name

    if test "$FC" = "ifort" -o "$FC" = "ifc" ; then

        pac_cv_fc_vendor=intel

    elif test "$FC" = "pgf90" ; then

        pac_cv_fc_vendor=pgi

    elif test "$FC" = "xlf90" -o "$FC" = "xlf90_r" ; then

        pac_cv_fc_vendor=ibm

    elif test "$FC" = "xlf95" -o "$FC" = "xlf95_r" ; then

        pac_cv_fc_vendor=ibm

    fi

fi

AC_MSG_RESULT([$pac_cv_fc_vendor])

rm -f conftest.txt

# End of checking for F90 compiler vendor

])

dnl

dnl PAC_F77_IS_FC([ACTION_IF_TRUE],[ACTION_IF_FALSE])

dnl Check if F77 is a Fortran 90 compiler.

dnl

AC_DEFUN([PAC_F77_IS_FC],[

AC_MSG_CHECKING([whether $F77 is a Fortran 90 compiler])

AC_LANG_PUSH([Fortran 77])

saved_ac_ext=$ac_ext

ac_ext="f90"

AC_LINK_IFELSE([

    AC_LANG_SOURCE([

        program main

        integer, dimension(10) :: n

        integer k

        print *,  range(k)

        end

    ])

],[

    pac_cv_prog_f77_is_fc=yes

    ifelse([$1],[],[],[$1])

],[

    pac_cv_prog_f77_is_fc=no

    ifelse([$2],[],[],[$2])