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annotate m4/octave_blas_f77_func.m4 @ 31122:1077a1c277fb

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build: Use caching for Fortran values in configure. * configure.ac: Rename ax_blas_integer_size to ax_cv_blas_integer_size. * octave_blas_f77_func.m4: Use AC_CACHE_CHECK macro for Fortran values. Rename values from "ax_blas_..." to "ax_cv_blas_..." to comply with requirement for "_cv_" in configure cache naming.
author Rik <rik@octave.org>
date Wed, 06 Jul 2022 22:03:13 -0700
parents f19e621d7f2d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # OCTAVE_BLAS_F77_FUNC
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2 #
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3 # The same as AX_BLAS_F77_FUNC (described below) except attempt to
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4 # determine whether the BLAS library uses 32- or 64-bit integers instead
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5 # of failing if the default size of Fortran integers does not appear to
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6 # match the size of integers used by the BLAS library.
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7
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8 # ===========================================================================
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9 # https://www.gnu.org/software/autoconf-archive/ax_blas_f77_func.html
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10 # ===========================================================================
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11 #
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12 # SYNOPSIS
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13 #
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14 # AX_BLAS_F77_FUNC([ACTION-IF-PASS[, ACTION-IF-FAIL[, ACTION-IF-CROSS-COMPILING]])
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15 # AX_BLAS_WITH_F77_FUNC([ACTION-IF-FOUND-AND-PASS[, ACTION-IF-NOT-FOUND-OR-FAIL]])
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16 #
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17 # DESCRIPTION
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18 #
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19 # These macros are intended as a supplement to the AX_BLAS macro, to
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20 # verify that BLAS functions are properly callable from Fortran. This is
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21 # necessary, for example, if you want to build the LAPACK library on top
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22 # of the BLAS.
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23 #
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24 # AX_BLAS_F77_FUNC uses the defined BLAS_LIBS and Fortran environment to
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25 # check for compatibility, and takes a specific action in case of success,
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26 # resp. failure, resp. cross-compilation.
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27 #
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28 # AX_BLAS_WITH_F77_FUNC is a drop-in replacement wrapper for AX_BLAS that
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29 # calls AX_BLAS_F77_FUNC after detecting a BLAS library and rejects it on
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30 # failure (i.e. pretends that no library was found).
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31 #
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32 # LICENSE
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33 #
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34 # Copyright (c) 2008 Jaroslav Hajek <highegg@gmail.com>
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35 #
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36 # This program is free software: you can redistribute it and/or modify it
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37 # under the terms of the GNU General Public License as published by the
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38 # Free Software Foundation, either version 3 of the License, or (at your
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39 # option) any later version.
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40 #
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41 # This program is distributed in the hope that it will be useful, but
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42 # WITHOUT ANY WARRANTY; without even the implied warranty of
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43 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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44 # Public License for more details.
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45 #
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46 # You should have received a copy of the GNU General Public License along
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47 # with this program. If not, see <https://www.gnu.org/licenses/>.
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48 #
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49 # As a special exception, the respective Autoconf Macro's copyright owner
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50 # gives unlimited permission to copy, distribute and modify the configure
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51 # scripts that are the output of Autoconf when processing the Macro. You
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52 # need not follow the terms of the GNU General Public License when using
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53 # or distributing such scripts, even though portions of the text of the
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54 # Macro appear in them. The GNU General Public License (GPL) does govern
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55 # all other use of the material that constitutes the Autoconf Macro.
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56 #
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57 # This special exception to the GPL applies to versions of the Autoconf
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58 # Macro released by the Autoconf Archive. When you make and distribute a
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59 # modified version of the Autoconf Macro, you may extend this special
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60 # exception to the GPL to apply to your modified version as well.
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61
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62 #serial 8
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63
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64 ## Derived from
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65 AC_DEFUN([OCTAVE_BLAS_F77_FUNC], [
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66 AC_PREREQ(2.50)
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67 AC_REQUIRE([AX_BLAS])
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68
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69 # F77 call-compatibility checks
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70 if test "$cross_compiling" = yes ; then
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71 ifelse($3, ,$1,$3)
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72 elif test x"$ax_blas_ok" = xyes; then
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73 save_ax_blas_f77_func_LIBS="$LIBS"
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74 LIBS="$BLAS_LIBS $LIBS"
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75 AC_LANG_PUSH(Fortran 77)
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76 # LSAME check (LOGICAL return values)
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77 AC_CACHE_CHECK([whether LSAME is called correctly from Fortran],
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78 [ax_cv_blas_lsame_fcall_ok],
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79 [AC_RUN_IFELSE([AC_LANG_PROGRAM(,[[
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80 logical lsame,w
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81 external lsame
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82 character c1,c2
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83 c1 = 'A'
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84 c2 = 'B'
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85 w = lsame(c1,c2)
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86 if (w) stop 1
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87 w = lsame(c1,c1)
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88 if (.not. w) stop 1
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89 ]])],
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90 ax_cv_blas_lsame_fcall_ok=yes,
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91 ax_cv_blas_lsame_fcall_ok=no)
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92 ])
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93 # ISAMAX check (INTEGER return values)
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94 # FIXME: This value is never used, so why do we calculate it?
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95 AC_CACHE_CHECK([whether ISAMAX is called correctly from Fortran],
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96 [ax_cv_blas_isamax_fcall_ok],
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97 [AC_RUN_IFELSE([AC_LANG_PROGRAM(,[[
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98 integer isamax,i
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99 external isamax
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100 real a(2)
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101 a(1) = 1e0
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102 a(2) = -2e0
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103 i = isamax(2,a,1)
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104 if (i.ne.2) stop 1
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105 ]])],
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106 ax_cv_blas_isamax_fcall_ok=yes,
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107 ax_cv_blas_isamax_fcall_ok=no)
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108 ])
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109 # SDOT check (REAL return values)
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110 AC_CACHE_CHECK([whether SDOT is called correctly from Fortran],
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111 [ax_cv_blas_sdot_fcall_ok],
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112 [AC_RUN_IFELSE([AC_LANG_PROGRAM(,[[
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113 real sdot,a(1),b(1),w
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114 external sdot
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115 a(1) = 1e0
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116 b(1) = 2e0
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117 w = sdot(1,a,1,b,1)
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118 if (w .ne. a(1)*b(1)) stop 1
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119 ]])],
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120 ax_cv_blas_sdot_fcall_ok=yes,
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121 ax_cv_blas_sdot_fcall_ok=no)
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122 ])
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123 # DDOT check (DOUBLE return values)
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124 AC_CACHE_CHECK([whether DDOT is called correctly from Fortran],
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125 [ax_cv_blas_ddot_fcall_ok],
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126 [AC_RUN_IFELSE([AC_LANG_PROGRAM(,[[
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127 double precision ddot,a(1),b(1),w
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128 external ddot
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129 a(1) = 1d0
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130 b(1) = 2d0
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131 w = ddot(1,a,1,b,1)
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132 if (w .ne. a(1)*b(1)) stop 1
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133 ]])],
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134 ax_cv_blas_ddot_fcall_ok=yes,
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135 ax_cv_blas_ddot_fcall_ok=no)
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136 ])
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137 # CDOTU check (COMPLEX return values)
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138 AC_CACHE_CHECK([whether CDOTU is called correctly from Fortran],
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139 [ax_cv_blas_cdotu_fcall_ok],
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140 [AC_RUN_IFELSE([AC_LANG_PROGRAM(,[[
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141 complex cdotu,a(1),b(1),w
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142 external cdotu
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143 a(1) = cmplx(1e0,1e0)
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144 b(1) = cmplx(1e0,2e0)
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145 w = cdotu(1,a,1,b,1)
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146 if (w .ne. a(1)*b(1)) stop 1
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147 ]])],
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148 ax_cv_blas_cdotu_fcall_ok=yes,
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149 ax_cv_blas_cdotu_fcall_ok=no)
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150 ])
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151 # ZDOTU check (DOUBLE COMPLEX return values)
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152 AC_CACHE_CHECK([whether ZDOTU is called correctly from Fortran],
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153 [ax_cv_blas_zdotu_fcall_ok],
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154 [AC_RUN_IFELSE([AC_LANG_PROGRAM(,[[
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155 double complex zdotu,a(1),b(1),w
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156 external zdotu
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157 a(1) = dcmplx(1d0,1d0)
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158 b(1) = dcmplx(1d0,2d0)
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159 w = zdotu(1,a,1,b,1)
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160 if (w .ne. a(1)*b(1)) stop 1
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161 ]])],
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162 ax_cv_blas_zdotu_fcall_ok=yes,
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163 ax_cv_blas_zdotu_fcall_ok=no)
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164 ])
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165 # Check BLAS library integer size. If it does not appear to be
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166 # 8 bytes, we assume it is 4 bytes.
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167 # FIXME: this may fail with things like -ftrapping-math.
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168 AC_CACHE_CHECK([BLAS library integer size],
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169 [ax_cv_blas_integer_size],
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170 [AC_RUN_IFELSE([AC_LANG_PROGRAM(,[[
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171 integer*8 two, n
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172 integer*4 n2(2)
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173 double precision d, a(1), b(1), ddot
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174 equivalence (n, n2)
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175
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176 a(1) = 1.0
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177 b(1) = 1.0
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178
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179 c Generate 2**32 + 1 in an 8-byte integer. Whether we have a big
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180 c endian or little endian system, both 4-byte words of this value
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181 c should be 1.
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182
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183 two = 2
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184 n = (two ** 32) + 1
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185
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186 c Check that our expectation about the type conversions are correct.
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187
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188 if (n2(1) .ne. 1 .or. n2(2) .ne. 1) then
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189 print *, 'invalid assumption about integer type conversion'
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190 stop 2
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191 endif
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192
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193 * print *, n, n2(1), n2(2)
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194 * print *, a(1), b(1)
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195
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196 c DDOT will either see 1 or a large value for N. Since INCX and INCY
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197 c are both 0, we will never increment the index, so A and B only need to
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198 c have a single element. If N is interpreted as 1 (BLAS compiled with 4
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199 c byte integers) then the result will be 1. If N is interpreted as a
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200 c large value (BLAS compiled with 8 byte integers) then the result will
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201 c be the summation a(1)*b(1) 2^32+1 times. This will also take some
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202 c time to compute, but at least for now it is the unusual case so we are
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203 c much more likely to exit quickly after detecting that the BLAS library
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204 c was compiled with 4-byte integers.
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205
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206 d = ddot (n, a, 0, b, 0)
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207
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208 * print *, a(1), b(1), d
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209
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210 c Success (0 exit status) means we detected BLAS compiled with
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211 c 8-byte integers.
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212
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213 if (d .eq. 1.0) then
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214 stop 1
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215 endif
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216
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217 ]])],
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218 ax_cv_blas_integer_size=8,
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219 ax_cv_blas_integer_size=4)
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220 ])
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221
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222 AC_LANG_POP(Fortran 77)
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223
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224 # if any of the tests failed, reject the BLAS library
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225 if test $ax_cv_blas_lsame_fcall_ok = yes \
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226 -a $ax_cv_blas_sdot_fcall_ok = yes \
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227 -a $ax_cv_blas_ddot_fcall_ok = yes \
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228 -a $ax_cv_blas_cdotu_fcall_ok = yes \
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229 -a $ax_cv_blas_zdotu_fcall_ok = yes ; then
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230 ax_blas_f77_func_ok=yes;
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diff changeset
231 $1
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232 else
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233 ax_blas_f77_func_ok=no;
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234 $2
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235 fi
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236 LIBS="$save_ax_blas_f77_func_LIBS"
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237 fi
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238
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239 ])dnl AX_BLAS_F77_FUNC
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240
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241 AC_DEFUN([OCTAVE_BLAS_WITH_F77_FUNC], [
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242 AC_PREREQ(2.50)
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243 AX_BLAS([# disable special action], [])
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244 if test x$ax_blas_ok = xyes ; then
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245 OCTAVE_BLAS_F77_FUNC(
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246 [ifelse([$1],,AC_DEFINE(HAVE_BLAS,1,[Define if you have a BLAS library.]),[$1])],
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247 [ax_blas_ok=no; BLAS_LIBS=])
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248 fi
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249 if test x$ax_blas_ok = xno ; then
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250 :
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251 $2
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252 fi
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253 ])dnl AX_BLAS_WITH_F77_FUNC