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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