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acx_blas_f77_func

Synopsis

ACX_BLAS_F77_FUNC([ACTION-IF-PASS[, ACTION-IF-FAIL[, ACTION-IF-CROSS-COMPILING]])
ACX_BLAS_WITH_F77_FUNC([ACTION-IF-FOUND-AND-PASS[, ACTION-IF-NOT-FOUND-OR-FAIL]])

Description

These macros are intended as a supplement to the ACX_BLAS macro, to verify that BLAS functions are properly callable from Fortran. This is necessary, for example, if you want to build the LAPACK library on top of the BLAS.

ACX_BLAS_F77_FUNC uses the defined BLAS_LIBS and Fortran environment to check for compatibility, and takes a specific action in case of success, resp. failure, resp. cross-compilation.

ACX_BLAS_WITH_F77_FUNC is a drop-in replacement wrapper for ACX_BLAS that calls ACX_BLAS_F77_FUNC after detecting a BLAS library and rejects it on failure (i.e. pretends that no library was found).

Author

Jaroslav Hajek <highegg@gmail.com>

Last Modified

2008-06-18

Cross References

group18-xrefs.png

M4 Source Code

AC_DEFUN([ACX_BLAS_F77_FUNC], [
AC_PREREQ(2.50)
AC_REQUIRE([ACX_BLAS])

# F77 call-compatibility checks
if test "$cross_compiling" = yes ; then
        ifelse($3, ,$1,$3)
elif test x"$acx_blas_ok" = xyes; then
        LIBS="$BLAS_LIBS $LIBS"
        AC_LANG_PUSH(Fortran 77)
# LSAME check (LOGICAL return values)
        AC_MSG_CHECKING([whether LSAME is called correctly from Fortran])
        AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[
      logical lsame,w
      external lsame
      character c1,c2
      c1 = 'A'
      c2 = 'B'
      w = lsame(c1,c2)
      if (w) stop 1
      w = lsame(c1,c1)
      if (.not. w) stop 1
      ]]),[acx_blas_lsame_fcall_ok=yes],
        [acx_blas_lsame_fcall_ok=no])
        AC_MSG_RESULT([$acx_blas_lsame_fcall_ok])
# ISAMAX check (INTEGER return values)
        AC_MSG_CHECKING([whether ISAMAX is called correctly from Fortran])
        AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[
      integer isamax,i
      external isamax
      real a(2)
      a(1) = 1e0
      a(2) = -2e0
      i = isamax(2,a,1)
      if (i.ne.2) stop 1
      ]]),[acx_blas_isamax_fcall_ok=yes],
        [acx_blas_isamax_fcall_ok=no])
        AC_MSG_RESULT([$acx_blas_isamax_fcall_ok])
# SDOT check (REAL return values)
        AC_MSG_CHECKING([whether DDOT is called correctly from Fortran])
        AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[
      real sdot,a(1),b(1),w
      external sdot
      a(1) = 1e0
      b(1) = 2e0
      w = sdot(1,a,1,b,1)
      if (w .ne. a(1)*b(1)) stop 1
      ]]),[acx_blas_sdot_fcall_ok=yes],
        [acx_blas_sdot_fcall_ok=no])
        AC_MSG_RESULT([$acx_blas_sdot_fcall_ok])
# DDOT check (DOUBLE return values)
        AC_MSG_CHECKING([whether DDOT is called correctly from Fortran])
        AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[
      double precision ddot,a(1),b(1),w
      external ddot
      a(1) = 1d0
      b(1) = 2d0
      w = ddot(1,a,1,b,1)
      if (w .ne. a(1)*b(1)) stop 1
      ]]),[acx_blas_ddot_fcall_ok=yes],
        [acx_blas_ddot_fcall_ok=no])
        AC_MSG_RESULT([$acx_blas_ddot_fcall_ok])
# CDOTU check (COMPLEX return values)
        AC_MSG_CHECKING([whether CDOTU is called correctly from Fortran])
        AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[
      complex cdotu,a(1),b(1),w
      external cdotu
      a(1) = cmplx(1e0,1e0)
      b(1) = cmplx(1e0,2e0)
      w = cdotu(1,a,1,b,1)
      if (w .ne. a(1)*b(1)) stop 1
      ]]),[acx_blas_cdotu_fcall_ok=yes],
        [acx_blas_cdotu_fcall_ok=no])
        AC_MSG_RESULT([$acx_blas_cdotu_fcall_ok])
# ZDOTU check (DOUBLE COMPLEX return values)
        AC_MSG_CHECKING([whether ZDOTU is called correctly from Fortran])
        AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[
      double complex zdotu,a(1),b(1),w
      external zdotu
      a(1) = dcmplx(1d0,1d0)
      b(1) = dcmplx(1d0,2d0)
      w = zdotu(1,a,1,b,1)
      if (w .ne. a(1)*b(1)) stop 1
      ]]),[acx_blas_zdotu_fcall_ok=yes],
        [acx_blas_zdotu_fcall_ok=no])
        AC_MSG_RESULT([$acx_blas_zdotu_fcall_ok])

        AC_LANG_POP(Fortran 77)

# if any of the tests failed, reject the BLAS library
        if test $acx_blas_lsame_fcall_ok = yes \
                -a $acx_blas_sdot_fcall_ok = yes \
                -a $acx_blas_ddot_fcall_ok = yes \
                -a $acx_blas_cdotu_fcall_ok = yes \
                -a $acx_blas_zdotu_fcall_ok = yes ; then
                acx_blas_f77_func_ok=yes;
                $1
        else
                acx_blas_f77_func_ok=no;
                $2
        fi
fi

])dnl ACX_BLAS_F77_FUNC

AC_DEFUN([ACX_BLAS_WITH_F77_FUNC], [
AC_PREREQ(2.50)
ACX_BLAS([# disable special action], [])
if test x$acx_blas_ok = xyes ; then
        ACX_BLAS_F77_FUNC(
        [ifelse([$1],,AC_DEFINE(HAVE_BLAS,1,[Define if you have a BLAS library.]),[$1])],
        [acx_blas_ok=no; BLAS_LIBS=])
fi
if test x$acx_blas_ok = xno ; then
        $2
fi
])dnl ACX_BLAS_WITH_F77_FUNC

License

Copyright © 2008 Jaroslav Hajek <highegg@gmail.com>

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>.

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