# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_lapack.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_LAPACK([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
#
# DESCRIPTION
#
# This macro looks for a library that implements the LAPACK linear-algebra
# interface (see http://www.netlib.org/lapack/). On success, it sets the
# LAPACK_LIBS output variable to hold the requisite library linkages.
#
# To link with LAPACK, you should link with:
#
# $LAPACK_LIBS $BLAS_LIBS $LIBS $FLIBS
#
# in that order. BLAS_LIBS is the output variable of the AX_BLAS macro,
# called automatically. FLIBS is the output variable of the
# AC_F77_LIBRARY_LDFLAGS macro (called if necessary by AX_BLAS), and is
# sometimes necessary in order to link with F77 libraries. Users will also
# need to use AC_F77_DUMMY_MAIN (see the autoconf manual), for the same
# reason.
#
# The user may also use --with-lapack= in order to use some specific
# LAPACK library . In order to link successfully, however, be aware
# that you will probably need to use the same Fortran compiler (which can
# be set via the F77 env. var.) as was used to compile the LAPACK and BLAS
# libraries.
#
# ACTION-IF-FOUND is a list of shell commands to run if a LAPACK library
# is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
# is not found. If ACTION-IF-FOUND is not specified, the default action
# will define HAVE_LAPACK.
#
# LICENSE
#
# Copyright (c) 2009 Steven G. Johnson
# Copyright (c) 2019 Geoffrey M. Oxberry
#
# 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 .
#
# 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 10
AU_ALIAS([ACX_LAPACK], [AX_LAPACK])
AC_DEFUN([AX_LAPACK], [
AC_REQUIRE([AX_BLAS])
ax_lapack_ok=no
AC_ARG_WITH(lapack,
[AS_HELP_STRING([--with-lapack=], [use LAPACK library ])])
case $with_lapack in
yes | "") ;;
no) ax_lapack_ok=disable ;;
-* | */* | *.a | *.so | *.so.* | *.dylib | *.dylib.* | *.o)
LAPACK_LIBS="$with_lapack"
;;
*) LAPACK_LIBS="-l$with_lapack" ;;
esac
# Get fortran linker name of LAPACK function to check for.
AC_F77_FUNC(cheev)
# We cannot use LAPACK if BLAS is not found
if test "x$ax_blas_ok" != xyes; then
ax_lapack_ok=noblas
LAPACK_LIBS=""
fi
# First, check LAPACK_LIBS environment variable
if test "x$LAPACK_LIBS" != x; then
save_LIBS="$LIBS"; LIBS="$LAPACK_LIBS $BLAS_LIBS $LIBS $FLIBS"
AC_MSG_CHECKING([for $cheev in $LAPACK_LIBS])
AC_LINK_IFELSE([AC_LANG_CALL([], [$cheev])], [ax_lapack_ok=yes], [LAPACK_LIBS=""])
AC_MSG_RESULT($ax_lapack_ok)
LIBS="$save_LIBS"
if test $ax_lapack_ok = no; then
LAPACK_LIBS=""
fi
fi
# LAPACK linked to by default? (is sometimes included in BLAS lib)
if test $ax_lapack_ok = no; then
save_LIBS="$LIBS"; LIBS="$LIBS $BLAS_LIBS $FLIBS"
AC_CHECK_FUNC($cheev, [ax_lapack_ok=yes])
LIBS="$save_LIBS"
fi
# Generic LAPACK library?
for lapack in lapack lapack_rs6k; do
if test $ax_lapack_ok = no; then
save_LIBS="$LIBS"; LIBS="$BLAS_LIBS $LIBS"
AC_CHECK_LIB($lapack, $cheev,
[ax_lapack_ok=yes; LAPACK_LIBS="-l$lapack"], [], [$FLIBS])
LIBS="$save_LIBS"
fi
done
AC_SUBST(LAPACK_LIBS)
# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test x"$ax_lapack_ok" = xyes; then
ifelse([$1],,AC_DEFINE(HAVE_LAPACK,1,[Define if you have LAPACK library.]),[$1])
:
else
ax_lapack_ok=no
$2
fi
])dnl AX_LAPACK