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1 # ===========================================================================
2 # https://www.gnu.org/software/autoconf-archive/ax_lapack.html
3 # ===========================================================================
4 #
5 # SYNOPSIS
6 #
7 # AX_LAPACK([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
8 #
9 # DESCRIPTION
10 #
11 # This macro looks for a library that implements the LAPACK linear-algebra
12 # interface (see http://www.netlib.org/lapack/). On success, it sets the
13 # LAPACK_LIBS output variable to hold the requisite library linkages.
14 #
15 # To link with LAPACK, you should link with:
16 #
17 # $LAPACK_LIBS $BLAS_LIBS $LIBS $FLIBS
18 #
19 # in that order. BLAS_LIBS is the output variable of the AX_BLAS macro,
20 # called automatically. FLIBS is the output variable of the
21 # AC_F77_LIBRARY_LDFLAGS macro (called if necessary by AX_BLAS), and is
22 # sometimes necessary in order to link with F77 libraries. Users will also
23 # need to use AC_F77_DUMMY_MAIN (see the autoconf manual), for the same
24 # reason.
25 #
26 # The user may also use --with-lapack=<lib> in order to use some specific
27 # LAPACK library <lib>. In order to link successfully, however, be aware
28 # that you will probably need to use the same Fortran compiler (which can
29 # be set via the F77 env. var.) as was used to compile the LAPACK and BLAS
30 # libraries.
31 #
32 # ACTION-IF-FOUND is a list of shell commands to run if a LAPACK library
33 # is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
34 # is not found. If ACTION-IF-FOUND is not specified, the default action
35 # will define HAVE_LAPACK.
36 #
37 # LICENSE
38 #
39 # Copyright (c) 2009 Steven G. Johnson <stevenj@alum.mit.edu>
40 # Copyright (c) 2019 Geoffrey M. Oxberry <goxberry@gmail.com>
41 #
42 # This program is free software: you can redistribute it and/or modify it
43 # under the terms of the GNU General Public License as published by the
44 # Free Software Foundation, either version 3 of the License, or (at your
45 # option) any later version.
46 #
47 # This program is distributed in the hope that it will be useful, but
48 # WITHOUT ANY WARRANTY; without even the implied warranty of
49 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
50 # Public License for more details.
51 #
52 # You should have received a copy of the GNU General Public License along
53 # with this program. If not, see <https://www.gnu.org/licenses/>.
54 #
55 # As a special exception, the respective Autoconf Macro's copyright owner
56 # gives unlimited permission to copy, distribute and modify the configure
57 # scripts that are the output of Autoconf when processing the Macro. You
58 # need not follow the terms of the GNU General Public License when using
59 # or distributing such scripts, even though portions of the text of the
60 # Macro appear in them. The GNU General Public License (GPL) does govern
61 # all other use of the material that constitutes the Autoconf Macro.
62 #
63 # This special exception to the GPL applies to versions of the Autoconf
64 # Macro released by the Autoconf Archive. When you make and distribute a
65 # modified version of the Autoconf Macro, you may extend this special
66 # exception to the GPL to apply to your modified version as well.
67
68 #serial 10
69
70 AU_ALIAS([ACX_LAPACK], [AX_LAPACK])
71 AC_DEFUN([AX_LAPACK], [
72 AC_REQUIRE([AX_BLAS])
73 ax_lapack_ok=no
74
75 AC_ARG_WITH(lapack,
76 [AS_HELP_STRING([--with-lapack=<lib>], [use LAPACK library <lib>])])
77 case $with_lapack in
78 yes | "") ;;
79 no) ax_lapack_ok=disable ;;
80 -* | */* | *.a | *.so | *.so.* | *.dylib | *.dylib.* | *.o)
81 LAPACK_LIBS="$with_lapack"
82 ;;
83 *) LAPACK_LIBS="-l$with_lapack" ;;
84 esac
85
86 # Get fortran linker name of LAPACK function to check for.
87 AC_F77_FUNC(cheev)
88
89 # We cannot use LAPACK if BLAS is not found
90 if test "x$ax_blas_ok" != xyes; then
91 ax_lapack_ok=noblas
92 LAPACK_LIBS=""
93 fi
94
95 # First, check LAPACK_LIBS environment variable
96 if test "x$LAPACK_LIBS" != x; then
97 save_LIBS="$LIBS"; LIBS="$LAPACK_LIBS $BLAS_LIBS $LIBS $FLIBS"
98 AC_MSG_CHECKING([for $cheev in $LAPACK_LIBS])
99 AC_LINK_IFELSE([AC_LANG_CALL([], [$cheev])], [ax_lapack_ok=yes], [LAPACK_LIBS=""])
100 AC_MSG_RESULT($ax_lapack_ok)
101 LIBS="$save_LIBS"
102 if test $ax_lapack_ok = no; then
103 LAPACK_LIBS=""
104 fi
105 fi
106
107 # LAPACK linked to by default? (is sometimes included in BLAS lib)
108 if test $ax_lapack_ok = no; then
109 save_LIBS="$LIBS"; LIBS="$LIBS $BLAS_LIBS $FLIBS"
110 AC_CHECK_FUNC($cheev, [ax_lapack_ok=yes])
111 LIBS="$save_LIBS"
112 fi
113
114 # Generic LAPACK library?
115 for lapack in lapack lapack_rs6k; do
116 if test $ax_lapack_ok = no; then
117 save_LIBS="$LIBS"; LIBS="$BLAS_LIBS $LIBS"
118 AC_CHECK_LIB($lapack, $cheev,
119 [ax_lapack_ok=yes; LAPACK_LIBS="-l$lapack"], [], [$FLIBS])
120 LIBS="$save_LIBS"
121 fi
122 done
123
124 AC_SUBST(LAPACK_LIBS)
125
126 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
127 if test x"$ax_lapack_ok" = xyes; then
128 ifelse([$1],,AC_DEFINE(HAVE_LAPACK,1,[Define if you have LAPACK library.]),[$1])
129 :
130 else
131 ax_lapack_ok=no
132 $2
133 fi
134 ])dnl AX_LAPACK