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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_blas_f77_func.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_BLAS_F77_FUNC([ACTION-IF-PASS[, ACTION-IF-FAIL[, ACTION-IF-CROSS-COMPILING]])
# AX_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 AX_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.
#
# AX_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.
#
# AX_BLAS_WITH_F77_FUNC is a drop-in replacement wrapper for AX_BLAS that
# calls AX_BLAS_F77_FUNC after detecting a BLAS library and rejects it on
# failure (i.e. pretends that no library was found).
#
# LICENSE
#
# Copyright (c) 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 <https://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 9
AU_ALIAS([ACX_BLAS_F77_FUNC], [AX_BLAS_F77_FUNC])
AC_DEFUN([AX_BLAS_F77_FUNC], [
AC_PREREQ(2.50)
AC_REQUIRE([AX_BLAS])
# F77 call-compatibility checks
if test "$cross_compiling" = yes ; then
ifelse($3, ,$1,$3)
elif test x"$ax_blas_ok" = xyes; then
save_ax_blas_f77_func_LIBS="$LIBS"
LIBS="$BLAS_LIBS $LIBS"
AC_LANG_PUSH(Fortran 77)
# LSAME check (LOGICAL return values)
AC_MSG_CHECKING([whether LSAME is called correctly from Fortran])
AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[
logical lsame,w
external lsame
character c1,c2
c1 = 'A'
c2 = 'B'
w = lsame(c1,c2)
if (w) stop 1
w = lsame(c1,c1)
if (.not. w) stop 1
]]),[ax_blas_lsame_fcall_ok=yes],
[ax_blas_lsame_fcall_ok=no])
AC_MSG_RESULT([$ax_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
]]),[ax_blas_isamax_fcall_ok=yes],
[ax_blas_isamax_fcall_ok=no])
AC_MSG_RESULT([$ax_blas_isamax_fcall_ok])
# SDOT check (REAL return values)
AC_MSG_CHECKING([whether SDOT is called correctly from Fortran])
AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[
real sdot,a(1),b(1),w
external sdot
a(1) = 1e0
b(1) = 2e0
w = sdot(1,a,1,b,1)
if (w .ne. a(1)*b(1)) stop 1
]]),[ax_blas_sdot_fcall_ok=yes],
[ax_blas_sdot_fcall_ok=no])
AC_MSG_RESULT([$ax_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
]]),[ax_blas_ddot_fcall_ok=yes],
[ax_blas_ddot_fcall_ok=no])
AC_MSG_RESULT([$ax_blas_ddot_fcall_ok])
# CDOTU check (COMPLEX return values)
AC_MSG_CHECKING([whether CDOTU is called correctly from Fortran])
AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[
complex cdotu,a(1),b(1),w
external cdotu
a(1) = cmplx(1e0,1e0)
b(1) = cmplx(1e0,2e0)
w = cdotu(1,a,1,b,1)
if (w .ne. a(1)*b(1)) stop 1
]]),[ax_blas_cdotu_fcall_ok=yes],
[ax_blas_cdotu_fcall_ok=no])
AC_MSG_RESULT([$ax_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
]]),[ax_blas_zdotu_fcall_ok=yes],
[ax_blas_zdotu_fcall_ok=no])
AC_MSG_RESULT([$ax_blas_zdotu_fcall_ok])
# Check for correct integer size
# FIXME: this may fail with things like -ftrapping-math.
AC_MSG_CHECKING([whether the integer size is correct])
AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[
integer n,nn(3)
real s,a(1),b(1),sdot
a(1) = 1.0
b(1) = 1.0
c Generate -2**33 + 1, if possible
n = 2
n = -4 * (n ** 30)
n = n + 1
if (n >= 0) goto 1
c This means we're on 64-bit integers. Check whether the BLAS is, too.
s = sdot(n,a,1,b,1)
if (s .ne. 0.0) stop 1
1 continue
c We may be on 32-bit integers, and the BLAS on 64 bits. This is almost bound
c to have already failed, but just in case, we'll check.
nn(1) = -1
nn(2) = 1
nn(3) = -1
s = sdot(nn(2),a,1,b,1)
if (s .ne. 1.0) stop 1
]]),[ax_blas_integer_size_ok=yes],
[ax_blas_integer_size_ok=no])
AC_MSG_RESULT([$ax_blas_integer_size_ok])
AC_LANG_POP(Fortran 77)
# if any of the tests failed, reject the BLAS library
if test $ax_blas_lsame_fcall_ok = yes \
-a $ax_blas_sdot_fcall_ok = yes \
-a $ax_blas_ddot_fcall_ok = yes \
-a $ax_blas_cdotu_fcall_ok = yes \
-a $ax_blas_zdotu_fcall_ok = yes \
-a $ax_blas_integer_size_ok = yes; then
ax_blas_f77_func_ok=yes;
$1
else
ax_blas_f77_func_ok=no;
$2
fi
LIBS="$save_ax_blas_f77_func_LIBS"
fi
])dnl AX_BLAS_F77_FUNC
AC_DEFUN([AX_BLAS_WITH_F77_FUNC], [
AC_PREREQ(2.50)
AX_BLAS([# disable special action], [])
if test x$ax_blas_ok = xyes ; then
AX_BLAS_F77_FUNC(
[ifelse([$1],,AC_DEFINE(HAVE_BLAS,1,[Define if you have a BLAS library.]),[$1])],
[ax_blas_ok=no; BLAS_LIBS=])
fi
if test x$ax_blas_ok = xno ; then
$2
fi
])dnl AX_BLAS_WITH_F77_FUNC
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