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