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annotate m4/expl.m4 @ 17440:0d0daceb5bdd

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nproc: relax license to LGPLv2+ nproc merely exposes alternatives to sysconf(_SC_NPROCESSORS_CONF), which is part of glibc and thus LGPLv2+; it is not adding any value that strategically requires LGPLv3+. See also this thread. https://lists.gnu.org/archive/html/bug-gnulib/2013-05/msg00105.html * modules/nproc (License): Change from LGPLv3+. Signed-off-by: Eric Blake <eblake@redhat.com>
author Eric Blake <eblake@redhat.com>
date Wed, 03 Jul 2013 15:34:30 -0600
parents e542fd46ad6f
children
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1 # expl.m4 serial 8
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2 dnl Copyright (C) 2010-2013 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_EXPL],
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8 [
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9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
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10 AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
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11
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12 dnl Persuade glibc <math.h> to declare expl().
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13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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14
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15 EXPL_LIBM=
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16 AC_CACHE_CHECK([whether expl() can be used without linking with libm],
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17 [gl_cv_func_expl_no_libm],
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18 [
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19 AC_LINK_IFELSE(
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20 [AC_LANG_PROGRAM(
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21 [[#ifndef __NO_MATH_INLINES
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22 # define __NO_MATH_INLINES 1 /* for glibc */
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23 #endif
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24 #include <math.h>
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25 long double (*funcptr) (long double) = expl;
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26 long double x;]],
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27 [[return funcptr (x) > 1.5
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28 || expl (x) > 1.5;]])],
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29 [gl_cv_func_expl_no_libm=yes],
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30 [gl_cv_func_expl_no_libm=no])
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31 ])
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32 if test $gl_cv_func_expl_no_libm = no; then
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33 AC_CACHE_CHECK([whether expl() can be used with libm],
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34 [gl_cv_func_expl_in_libm],
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35 [
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36 save_LIBS="$LIBS"
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37 LIBS="$LIBS -lm"
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38 AC_LINK_IFELSE(
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39 [AC_LANG_PROGRAM(
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40 [[#ifndef __NO_MATH_INLINES
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41 # define __NO_MATH_INLINES 1 /* for glibc */
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42 #endif
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43 #include <math.h>
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44 long double (*funcptr) (long double) = expl;
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45 long double x;]],
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46 [[return funcptr (x) > 1.5
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47 || expl (x) > 1.5;]])],
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48 [gl_cv_func_expl_in_libm=yes],
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49 [gl_cv_func_expl_in_libm=no])
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50 LIBS="$save_LIBS"
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51 ])
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52 if test $gl_cv_func_expl_in_libm = yes; then
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53 EXPL_LIBM=-lm
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54 fi
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55 fi
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56 if test $gl_cv_func_expl_no_libm = yes \
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57 || test $gl_cv_func_expl_in_libm = yes; then
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58 dnl Also check whether it's declared.
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59 dnl Mac OS X 10.3 has expl() in libc but doesn't declare it in <math.h>.
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60 AC_CHECK_DECL([expl], , [HAVE_DECL_EXPL=0], [[#include <math.h>]])
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61 else
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62 HAVE_DECL_EXPL=0
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63 HAVE_EXPL=0
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64 dnl Find libraries needed to link lib/expl.c.
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65 if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
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66 AC_REQUIRE([gl_FUNC_EXP])
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67 EXPL_LIBM="$EXP_LIBM"
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68 else
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69 AC_REQUIRE([gl_FUNC_ISNANL])
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70 AC_REQUIRE([gl_FUNC_ROUNDL])
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71 AC_REQUIRE([gl_FUNC_LDEXPL])
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72 EXPL_LIBM=
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73 dnl Append $ISNANL_LIBM to EXPL_LIBM, avoiding gratuitous duplicates.
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74 case " $EXPL_LIBM " in
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75 *" $ISNANL_LIBM "*) ;;
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76 *) EXPL_LIBM="$EXPL_LIBM $ISNANL_LIBM" ;;
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77 esac
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78 dnl Append $ROUNDL_LIBM to EXPL_LIBM, avoiding gratuitous duplicates.
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79 case " $EXPL_LIBM " in
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80 *" $ROUNDL_LIBM "*) ;;
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81 *) EXPL_LIBM="$EXPL_LIBM $ROUNDL_LIBM" ;;
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82 esac
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83 dnl Append $LDEXPL_LIBM to EXPL_LIBM, avoiding gratuitous duplicates.
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84 case " $EXPL_LIBM " in
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85 *" $LDEXPL_LIBM "*) ;;
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86 *) EXPL_LIBM="$EXPL_LIBM $LDEXPL_LIBM" ;;
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87 esac
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88 fi
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89 fi
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90 AC_SUBST([EXPL_LIBM])
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91 ])