--- a +++ b/m4/ax_lapack.m4 @@ -0,0 +1,131 @@ +# =========================================================================== +# http://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=<lib> in order to use some specific +# LAPACK library <lib>. 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 <stevenj@alum.mit.edu> +# +# 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/>. +# +# 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 7 + +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=<lib>], [use LAPACK library <lib>])]) +case $with_lapack in + yes | "") ;; + no) ax_lapack_ok=disable ;; + -* | */* | *.a | *.so | *.so.* | *.o) LAPACK_LIBS="$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 $LAPACK_LIBS]) + AC_TRY_LINK_FUNC($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