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[project @ 2002-04-04 00:44:21 by jwe]
author jwe
date Thu, 04 Apr 2002 00:46:37 +0000
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children 034cdbd34c0a
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3886:96919c87953c 3887:7da18459c08b
1 dnl @synopsis ACX_LAPACK([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
2 dnl
3 dnl This macro looks for a library that implements the LAPACK
4 dnl linear-algebra interface (see http://www.netlib.org/lapack/).
5 dnl On success, it sets the LAPACK_LIBS output variable to
6 dnl hold the requisite library linkages.
7 dnl
8 dnl To link with LAPACK, you should link with:
9 dnl
10 dnl $LAPACK_LIBS $BLAS_LIBS $LIBS $FLIBS
11 dnl
12 dnl in that order. BLAS_LIBS is the output variable of the ACX_BLAS
13 dnl macro, called automatically. FLIBS is the output variable of the
14 dnl AC_F77_LIBRARY_LDFLAGS macro (called if necessary by ACX_BLAS),
15 dnl and is sometimes necessary in order to link with F77 libraries.
16 dnl Users will also need to use AC_F77_DUMMY_MAIN (see the autoconf
17 dnl manual), for the same reason.
18 dnl
19 dnl The user may also use --with-lapack=<lib> in order to use some
20 dnl specific LAPACK library <lib>. In order to link successfully,
21 dnl however, be aware that you will probably need to use the same
22 dnl Fortran compiler (which can be set via the F77 env. var.) as
23 dnl was used to compile the LAPACK and BLAS libraries.
24 dnl
25 dnl ACTION-IF-FOUND is a list of shell commands to run if a LAPACK
26 dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands
27 dnl to run it if it is not found. If ACTION-IF-FOUND is not specified,
28 dnl the default action will define HAVE_LAPACK.
29 dnl
30 dnl @version $Id: acx_lapack.m4,v 1.3 2002/03/12 09:12:44 simons Exp $
31 dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
32
33 AC_DEFUN([ACX_LAPACK], [
34 AC_REQUIRE([ACX_BLAS])
35 acx_lapack_ok=no
36
37 AC_ARG_WITH(lapack,
38 [AC_HELP_STRING([--with-lapack=<lib>], [use LAPACK library <lib>])])
39 case $with_lapack in
40 yes | "") ;;
41 no) acx_lapack_ok=disable ;;
42 -* | */* | *.a | *.so | *.so.* | *.o) LAPACK_LIBS="$with_lapack" ;;
43 *) LAPACK_LIBS="-l$with_lapack" ;;
44 esac
45
46 # Get fortran linker name of LAPACK function to check for.
47 AC_F77_FUNC(cheev)
48
49 # We cannot use LAPACK if BLAS is not found
50 if test "x$acx_blas_ok" != xyes; then
51 acx_lapack_ok=noblas
52 fi
53
54 # First, check LAPACK_LIBS environment variable
55 if test "x$LAPACK_LIBS" != x; then
56 save_LIBS="$LIBS"; LIBS="$LAPACK_LIBS $BLAS_LIBS $LIBS $FLIBS"
57 AC_MSG_CHECKING([for $cheev in $LAPACK_LIBS])
58 AC_TRY_LINK_FUNC($cheev, [acx_lapack_ok=yes], [LAPACK_LIBS=""])
59 AC_MSG_RESULT($acx_lapack_ok)
60 LIBS="$save_LIBS"
61 if test acx_lapack_ok = no; then
62 LAPACK_LIBS=""
63 fi
64 fi
65
66 # LAPACK linked to by default? (is sometimes included in BLAS lib)
67 if test $acx_lapack_ok = no; then
68 save_LIBS="$LIBS"; LIBS="$LIBS $BLAS_LIBS $FLIBS"
69 AC_CHECK_FUNC($cheev, [acx_lapack_ok=yes])
70 LIBS="$save_LIBS"
71 fi
72
73 # Generic LAPACK library?
74 for lapack in lapack lapack_rs6k; do
75 if test $acx_lapack_ok = no; then
76 save_LIBS="$LIBS"; LIBS="$BLAS_LIBS $LIBS"
77 AC_CHECK_LIB($lapack, $cheev,
78 [acx_lapack_ok=yes; LAPACK_LIBS="-l$lapack"], [], [$FLIBS])
79 LIBS="$save_LIBS"
80 fi
81 done
82
83 AC_SUBST(LAPACK_LIBS)
84
85 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
86 if test x"$acx_lapack_ok" = xyes; then
87 ifelse([$1],,AC_DEFINE(HAVE_LAPACK,1,[Define if you have LAPACK library.]),[$1])
88 :
89 else
90 acx_lapack_ok=no
91 $2
92 fi
93 ])dnl ACX_LAPACK