fortran.m4

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# _AC_PROG_FC_G
# -------------
# Check whether -g works, even if F[C]FLAGS is set, in case the package
# plays around with F[C]FLAGS (such as to build both debugging and normal
# versions of a library), tasteless as that idea is.
m4_define([_AC_PROG_FC_G],
[_AC_FORTRAN_ASSERT()dnl
ac_test_FFLAGS=${[]_AC_LANG_PREFIX[]FLAGS+set}
ac_save_FFLAGS=$[]_AC_LANG_PREFIX[]FLAGS
_AC_LANG_PREFIX[]FLAGS=
AC_CACHE_CHECK(whether $[]_AC_FC[] accepts -g, ac_cv_prog_[]_AC_LANG_ABBREV[]_g,
[_AC_LANG_PREFIX[]FLAGS=-g
_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
[ac_cv_prog_[]_AC_LANG_ABBREV[]_g=yes],
[ac_cv_prog_[]_AC_LANG_ABBREV[]_g=no])
])
if test "$ac_test_FFLAGS" = set; then
  _AC_LANG_PREFIX[]FLAGS=$ac_save_FFLAGS
elif test $ac_cv_prog_[]_AC_LANG_ABBREV[]_g = yes; then
  if test "x$ac_cv_[]_AC_LANG_ABBREV[]_compiler_gnu" = xyes; then
    _AC_LANG_PREFIX[]FLAGS="-g -O2"
  else
    _AC_LANG_PREFIX[]FLAGS="-g"
  fi
else
  if test "x$ac_cv_[]_AC_LANG_ABBREV[]_compiler_gnu" = xyes; then
    _AC_LANG_PREFIX[]FLAGS="-O2"
  else
    _AC_LANG_PREFIX[]FLAGS=
  fi
fi[]dnl
])# _AC_PROG_FC_G


# _AC_PROG_FC_C_O
# ---------------
# Test if the Fortran compiler accepts the options `-c' and `-o'
# simultaneously, and define `[F77/FC]_NO_MINUS_C_MINUS_O' if it does not.
#
# The usefulness of this macro is questionable, as I can't really see
# why anyone would use it.  The only reason I include it is for
# completeness, since a similar test exists for the C compiler.
#
# FIXME: it seems like we could merge the C/C++/Fortran versions of this.
AC_DEFUN([_AC_PROG_FC_C_O],
[_AC_FORTRAN_ASSERT()dnl
AC_CACHE_CHECK([whether $[]_AC_FC[] understands -c and -o together],
               [ac_cv_prog_[]_AC_LANG_ABBREV[]_c_o],
[AC_LANG_CONFTEST([AC_LANG_PROGRAM([])])
# We test twice because some compilers refuse to overwrite an existing
# `.o' file with `-o', although they will create one.
ac_try='$[]_AC_FC[] $[]_AC_LANG_PREFIX[]FLAGS -c conftest.$ac_ext -o conftest2.$ac_objext >&AS_MESSAGE_LOG_FD'
rm -f conftest2.*
if _AC_DO_VAR(ac_try) &&
     test -f conftest2.$ac_objext &&
     _AC_DO_VAR(ac_try); then
  ac_cv_prog_[]_AC_LANG_ABBREV[]_c_o=yes
else
  ac_cv_prog_[]_AC_LANG_ABBREV[]_c_o=no
fi
rm -f conftest*])
if test $ac_cv_prog_[]_AC_LANG_ABBREV[]_c_o = no; then
  AC_DEFINE([]_AC_FC[]_NO_MINUS_C_MINUS_O, 1,
            [Define to 1 if your Fortran compiler doesn't accept
             -c and -o together.])
fi
])# _AC_PROG_FC_C_O


# AC_PROG_F77_C_O
# ---------------
AC_DEFUN([AC_PROG_F77_C_O],
[AC_REQUIRE([AC_PROG_F77])dnl
AC_LANG_PUSH(Fortran 77)dnl
_AC_PROG_FC_C_O
AC_LANG_POP(Fortran 77)dnl
])# AC_PROG_F77_C_O


# AC_PROG_FC_C_O
# ---------------
AC_DEFUN([AC_PROG_FC_C_O],
[AC_REQUIRE([AC_PROG_FC])dnl
AC_LANG_PUSH(Fortran)dnl
_AC_PROG_FC_C_O
AC_LANG_POP(Fortran)dnl
])# AC_PROG_FC_C_O


## ------------------------------- ##
## 4. Compilers' characteristics.  ##
## ------------------------------- ##


# ---------------------------------------- #
# 4d. Fortran 77 compiler characteristics. #
# ---------------------------------------- #


# _AC_PROG_FC_V_OUTPUT([FLAG = $ac_cv_prog_{f77/fc}_v])
# -------------------------------------------------
# Link a trivial Fortran program, compiling with a verbose output FLAG
# (whose default value, $ac_cv_prog_{f77/fc}_v, is computed by
# _AC_PROG_FC_V), and return the output in $ac_{f77/fc}_v_output.  This
# output is processed in the way expected by _AC_FC_LIBRARY_LDFLAGS,
# so that any link flags that are echoed by the compiler appear as
# space-separated items.
AC_DEFUN([_AC_PROG_FC_V_OUTPUT],
[_AC_FORTRAN_ASSERT()dnl
AC_LANG_CONFTEST([AC_LANG_PROGRAM([])])

# Compile and link our simple test program by passing a flag (argument
# 1 to this macro) to the Fortran compiler in order to get
# "verbose" output that we can then parse for the Fortran linker
# flags.
ac_save_FFLAGS=$[]_AC_LANG_PREFIX[]FLAGS
_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS m4_default([$1], [$ac_cv_prog_[]_AC_LANG_ABBREV[]_v])"
eval "set x $ac_link"
shift
_AS_ECHO_LOG([$[*]])
ac_[]_AC_LANG_ABBREV[]_v_output=`eval $ac_link AS_MESSAGE_LOG_FD>&1 2>&1 | grep -v 'Driving:'`
echo "$ac_[]_AC_LANG_ABBREV[]_v_output" >&AS_MESSAGE_LOG_FD
_AC_LANG_PREFIX[]FLAGS=$ac_save_FFLAGS

rm -f conftest*

# On HP/UX there is a line like: "LPATH is: /foo:/bar:/baz" where
# /foo, /bar, and /baz are search directories for the Fortran linker.
# Here, we change these into -L/foo -L/bar -L/baz (and put it first):
ac_[]_AC_LANG_ABBREV[]_v_output="`echo $ac_[]_AC_LANG_ABBREV[]_v_output |
	grep 'LPATH is:' |
	sed 's,.*LPATH is\(: *[[^ ]]*\).*,\1,;s,: */, -L/,g'` $ac_[]_AC_LANG_ABBREV[]_v_output"

# FIXME: we keep getting bitten by quoted arguments; a more general fix
#        that detects unbalanced quotes in FLIBS should be implemented
#        and (ugh) tested at some point.
case $ac_[]_AC_LANG_ABBREV[]_v_output in
  # If we are using xlf then replace all the commas with spaces.
  *xlfentry*)
    ac_[]_AC_LANG_ABBREV[]_v_output=`echo $ac_[]_AC_LANG_ABBREV[]_v_output | sed 's/,/ /g'` ;;

  # With Intel ifc, ignore the quoted -mGLOB_options_string stuff (quoted
  # $LIBS confuse us, and the libraries appear later in the output anyway).
  *mGLOB_options_string*)
    ac_[]_AC_LANG_ABBREV[]_v_output=`echo $ac_[]_AC_LANG_ABBREV[]_v_output | sed 's/"-mGLOB[[^"]]*"/ /g'` ;;

  # Portland Group compiler has singly- or doubly-quoted -cmdline argument
  # Singly-quoted arguments were reported for versions 5.2-4 and 6.0-4.
  # Doubly-quoted arguments were reported for "PGF90/x86 Linux/x86 5.0-2".
  *-cmdline\ * | *-ignore\ * | *-def\ *)
    ac_[]_AC_LANG_ABBREV[]_v_output=`echo $ac_[]_AC_LANG_ABBREV[]_v_output | sed "\
        s/-cmdline  *'[[^']]*'/ /g; s/-cmdline  *\"[[^\"]]*\"/ /g
        s/-ignore  *'[[^']]*'/ /g; s/-ignore  *\"[[^\"]]*\"/ /g
        s/-def  *'[[^']]*'/ /g; s/-def  *\"[[^\"]]*\"/ /g"` ;;

  # If we are using Cray Fortran then delete quotes.
  *cft90*)
    ac_[]_AC_LANG_ABBREV[]_v_output=`echo $ac_[]_AC_LANG_ABBREV[]_v_output | sed 's/"//g'` ;;
esac

])# _AC_PROG_FC_V_OUTPUT


# _AC_PROG_FC_V
# --------------
#
# Determine the flag that causes the Fortran compiler to print
# information of library and object files (normally -v)
# Needed for _AC_FC_LIBRARY_FLAGS
# Some compilers don't accept -v (Lahey: -verbose, xlf: -V, Fujitsu: -###)
AC_DEFUN([_AC_PROG_FC_V],
[_AC_FORTRAN_ASSERT()dnl
AC_CACHE_CHECK([how to get verbose linking output from $[]_AC_FC[]],
                [ac_cv_prog_[]_AC_LANG_ABBREV[]_v],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
[ac_cv_prog_[]_AC_LANG_ABBREV[]_v=
# Try some options frequently used verbose output
for ac_verb in -v -verbose --verbose -V -\#\#\#; do
  _AC_PROG_FC_V_OUTPUT($ac_verb)
  # look for -l* and *.a constructs in the output
  for ac_arg in $ac_[]_AC_LANG_ABBREV[]_v_output; do
     case $ac_arg in
        [[\\/]]*.a | ?:[[\\/]]*.a | -[[lLRu]]*)
          ac_cv_prog_[]_AC_LANG_ABBREV[]_v=$ac_verb
          break 2 ;;
     esac
  done
done
if test -z "$ac_cv_prog_[]_AC_LANG_ABBREV[]_v"; then
   AC_MSG_WARN([cannot determine how to obtain linking information from $[]_AC_FC[]])
fi],
                  [AC_MSG_WARN([compilation failed])])
])])# _AC_PROG_FC_V


# _AC_FC_LIBRARY_LDFLAGS
# ----------------------
#
# Determine the linker flags (e.g. "-L" and "-l") for the Fortran
# intrinsic and runtime libraries that are required to successfully
# link a Fortran program or shared library.  The output variable
# FLIBS/FCLIBS is set to these flags.
#
# This macro is intended to be used in those situations when it is
# necessary to mix, e.g. C++ and Fortran, source code into a single
# program or shared library.
#
# For example, if object files from a C++ and Fortran compiler must
# be linked together, then the C++ compiler/linker must be used for
# linking (since special C++-ish things need to happen at link time
# like calling global constructors, instantiating templates, enabling
# exception support, etc.).
#
# However, the Fortran intrinsic and runtime libraries must be
# linked in as well, but the C++ compiler/linker doesn't know how to
# add these Fortran libraries.  Hence, the macro
# "AC_F77_LIBRARY_LDFLAGS" was created to determine these Fortran
# libraries.
#
# This macro was packaged in its current form by Matthew D. Langston.
# However, nearly all of this macro came from the "OCTAVE_FLIBS" macro
# in "octave-2.0.13/aclocal.m4", and full credit should go to John
# W. Eaton for writing this extremely useful macro.  Thank you John.
AC_DEFUN([_AC_FC_LIBRARY_LDFLAGS],
[_AC_FORTRAN_ASSERT()dnl
_AC_PROG_FC_V
AC_CACHE_CHECK([for _AC_LANG libraries of $[]_AC_FC[]], ac_cv_[]_AC_LANG_ABBREV[]_libs,
[if test "x$[]_AC_LANG_PREFIX[]LIBS" != "x"; then
  ac_cv_[]_AC_LANG_ABBREV[]_libs="$[]_AC_LANG_PREFIX[]LIBS" # Let the user override the test.
else

_AC_PROG_FC_V_OUTPUT

ac_cv_[]_AC_LANG_ABBREV[]_libs=

# Save positional arguments (if any)
ac_save_positional="$[@]"

set X $ac_[]_AC_LANG_ABBREV[]_v_output
while test $[@%:@] != 1; do
  shift
  ac_arg=$[1]
  case $ac_arg in
        [[\\/]]*.a | ?:[[\\/]]*.a)
          _AC_LIST_MEMBER_IF($ac_arg, $ac_cv_[]_AC_LANG_ABBREV[]_libs, ,
              ac_cv_[]_AC_LANG_ABBREV[]_libs="$ac_cv_[]_AC_LANG_ABBREV[]_libs $ac_arg")
          ;;
        -bI:*)
          _AC_LIST_MEMBER_IF($ac_arg, $ac_cv_[]_AC_LANG_ABBREV[]_libs, ,
             [_AC_LINKER_OPTION([$ac_arg], ac_cv_[]_AC_LANG_ABBREV[]_libs)])
          ;;
          # Ignore these flags.
        -lang* | -lcrt*.o | -lc | -lgcc | -libmil | -LANG:=* | -LIST:* | -LNO:*)
          ;;
        -lkernel32)
          test x"$CYGWIN" != xyes && ac_cv_[]_AC_LANG_ABBREV[]_libs="$ac_cv_[]_AC_LANG_ABBREV[]_libs $ac_arg"
          ;;
        -[[LRuYz]])
          # These flags, when seen by themselves, take an argument.
          # We remove the space between option and argument and re-iterate
          # unless we find an empty arg or a new option (starting with -)
	  case $[2] in
	     "" | -*);;
	     *)
		ac_arg="$ac_arg$[2]"
		shift; shift
		set X $ac_arg "$[@]"
		;;
	  esac
          ;;
        -YP,*)
          for ac_j in `echo $ac_arg | sed -e 's/-YP,/-L/;s/:/ -L/g'`; do
            _AC_LIST_MEMBER_IF($ac_j, $ac_cv_[]_AC_LANG_ABBREV[]_libs, ,
                               [ac_arg="$ac_arg $ac_j"
                               ac_cv_[]_AC_LANG_ABBREV[]_libs="$ac_cv_[]_AC_LANG_ABBREV[]_libs $ac_j"])
          done
          ;;
        -[[lLR]]*)
          _AC_LIST_MEMBER_IF($ac_arg, $ac_cv_[]_AC_LANG_ABBREV[]_libs, ,
                             ac_cv_[]_AC_LANG_ABBREV[]_libs="$ac_cv_[]_AC_LANG_ABBREV[]_libs $ac_arg")
          ;;
	-zallextract*| -zdefaultextract)
	  ac_cv_[]_AC_LANG_ABBREV[]_libs="$ac_cv_[]_AC_LANG_ABBREV[]_libs $ac_arg"
	  ;;
          # Ignore everything else.
  esac
done
# restore positional arguments
set X $ac_save_positional; shift

# We only consider "LD_RUN_PATH" on Solaris systems.  If this is seen,
# then we insist that the "run path" must be an absolute path (i.e. it
# must begin with a "/").
case `(uname -sr) 2>/dev/null` in
   "SunOS 5"*)
      ac_ld_run_path=`echo $ac_[]_AC_LANG_ABBREV[]_v_output |
                        sed -n 's,^.*LD_RUN_PATH *= *\(/[[^ ]]*\).*$,-R\1,p'`
      test "x$ac_ld_run_path" != x &&
        _AC_LINKER_OPTION([$ac_ld_run_path], ac_cv_[]_AC_LANG_ABBREV[]_libs)
      ;;
esac
fi # test "x$[]_AC_LANG_PREFIX[]LIBS" = "x"
])
[]_AC_LANG_PREFIX[]LIBS="$ac_cv_[]_AC_LANG_ABBREV[]_libs"
AC_SUBST([]_AC_LANG_PREFIX[]LIBS)
])# _AC_FC_LIBRARY_LDFLAGS


# AC_F77_LIBRARY_LDFLAGS
# ----------------------
AC_DEFUN([AC_F77_LIBRARY_LDFLAGS],
[AC_REQUIRE([AC_PROG_F77])dnl
AC_LANG_PUSH(Fortran 77)dnl
_AC_FC_LIBRARY_LDFLAGS
AC_LANG_POP(Fortran 77)dnl
])# AC_F77_LIBRARY_LDFLAGS


# AC_FC_LIBRARY_LDFLAGS
# ----------------------
AC_DEFUN([AC_FC_LIBRARY_LDFLAGS],
[AC_REQUIRE([AC_PROG_FC])dnl
AC_LANG_PUSH(Fortran)dnl
_AC_FC_LIBRARY_LDFLAGS
AC_LANG_POP(Fortran)dnl
])# AC_FC_LIBRARY_LDFLAGS


# _AC_FC_DUMMY_MAIN([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
# -----------------------------------------------------------
#
# Detect name of dummy main routine required by the Fortran libraries,
# (if any) and define {F77,FC}_DUMMY_MAIN to this name (which should be
# used for a dummy declaration, if it is defined).  On some systems,
# linking a C program to the Fortran library does not work unless you
# supply a dummy function called something like MAIN__.
#
# Execute ACTION-IF-NOT-FOUND if no way of successfully linking a C
# program with the {F77,FC} libs is found; default to exiting with an error
# message.  Execute ACTION-IF-FOUND if a dummy routine name is needed
# and found or if it is not needed (default to defining {F77,FC}_DUMMY_MAIN
# when needed).
#
# What is technically happening is that the Fortran libraries provide
# their own main() function, which usually initializes Fortran I/O and
# similar stuff, and then calls MAIN__, which is the entry point of
# your program.  Usually, a C program will override this with its own
# main() routine, but the linker sometimes complain if you don't
# provide a dummy (never-called) MAIN__ routine anyway.
#
# Of course, programs that want to allow Fortran subroutines to do
# I/O, etcetera, should call their main routine MAIN__() (or whatever)
# instead of main().  A separate autoconf test (_AC_FC_MAIN) checks
# for the routine to use in this case (since the semantics of the test
# are slightly different).  To link to e.g. purely numerical
# libraries, this is normally not necessary, however, and most C/C++
# programs are reluctant to turn over so much control to Fortran.  =)
#
# The name variants we check for are (in order):
#   MAIN__ (g77, MAIN__ required on some systems; IRIX, MAIN__ optional)
#   MAIN_, __main (SunOS)
#   MAIN _MAIN __MAIN main_ main__ _main (we follow DDD and try these too)
AC_DEFUN([_AC_FC_DUMMY_MAIN],
[_AC_FORTRAN_ASSERT()dnl
m4_define(_AC_LANG_PROGRAM_C_[]_AC_FC[]_HOOKS,
[#ifdef ]_AC_FC[_DUMMY_MAIN
]AC_LANG_CASE([Fortran], [#ifndef FC_DUMMY_MAIN_EQ_F77])
[#  ifdef __cplusplus
     extern "C"
#  endif
   int ]_AC_FC[_DUMMY_MAIN() { return 1; }
]AC_LANG_CASE([Fortran], [#endif])
[#endif
])
AC_CACHE_CHECK([for dummy main to link with _AC_LANG libraries],
               ac_cv_[]_AC_LANG_ABBREV[]_dummy_main,
[ac_[]_AC_LANG_ABBREV[]_dm_save_LIBS=$LIBS
 LIBS="$LIBS $[]_AC_LANG_PREFIX[]LIBS"
 ac_fortran_dm_var=[]_AC_FC[]_DUMMY_MAIN
 AC_LANG_PUSH(C)dnl

 # First, try linking without a dummy main:
 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
                [ac_cv_fortran_dummy_main=none],
                [ac_cv_fortran_dummy_main=unknown])

 if test $ac_cv_fortran_dummy_main = unknown; then
   for ac_func in MAIN__ MAIN_ __main MAIN _MAIN __MAIN main_ main__ _main; do
     AC_LINK_IFELSE([AC_LANG_PROGRAM([[@%:@define $ac_fortran_dm_var $ac_func]])],
                    [ac_cv_fortran_dummy_main=$ac_func; break])
   done
 fi
 AC_LANG_POP(C)dnl
 ac_cv_[]_AC_LANG_ABBREV[]_dummy_main=$ac_cv_fortran_dummy_main
 rm -f conftest*
 LIBS=$ac_[]_AC_LANG_ABBREV[]_dm_save_LIBS
])
[]_AC_FC[]_DUMMY_MAIN=$ac_cv_[]_AC_LANG_ABBREV[]_dummy_main
AS_IF([test "$[]_AC_FC[]_DUMMY_MAIN" != unknown],
      [m4_default([$1],
[if test $[]_AC_FC[]_DUMMY_MAIN != none; then
  AC_DEFINE_UNQUOTED([]_AC_FC[]_DUMMY_MAIN, $[]_AC_FC[]_DUMMY_MAIN,
                     [Define to dummy `main' function (if any) required to
                      link to the Fortran libraries.])
  if test "x$ac_cv_fc_dummy_main" = "x$ac_cv_f77_dummy_main"; then
	AC_DEFINE([FC_DUMMY_MAIN_EQ_F77], 1,
                  [Define if F77 and FC dummy `main' functions are identical.])
  fi
fi])],
      [m4_default([$2],